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V

PROVIDING

SYSTEMEFFICIENCY

ANDPROTECTION

AIR VALVES

Bulletin 1500

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TABLE OF CONTENTUNDERSTANDING AIR VALVES

Air and Its Impact on a Water and Wastewater System pp. 3-7

Exclusive Features and Benefits p. 8

Wastewater Features and Benefits p. 9

AIR VALVE APPLICATIONS

Basic Applications and Solutions p. 10

Applications, Functions, Purpose, and Features Chart p. 11

TECHNICAL DATA

Water and Wastewater Air Release Valves pp. 12-13

Water and Wastewater Air/Vacuum Valves pp. 14-15

Water & Wastewater Combination Air Valves pp. 16-19

Anti-Slam Combination Air Valves pp. 20-21

Well Service Air Valves pp. 22-23

Vacuum Breaker Valves pp. 24-25

Vacuum Priming Valves pp. 26-27

VCopyright 2004 Val-Matic Valve & Mfg. Corp.

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One of the most misunderstood aspects of the

Water & Wastewater industry is the presence of

air in a pipeline and its impact on operations.

Many operational problems, especially at the time of initial

start-up including broken pumps, valves and pipe, as well

as faulty instrumentation readings, are blamed on

inadequate thrust blocking, improper pipeline bedding, etc.

In reality, many of these problems are not caused by

improper installation of the line, but by failure to de-aerate

the line. Properly de-aerating your pipeline will safeguard it

from air-related problems, however if no steps are taken to

accomplish this, you should be ready for trouble.

SOURCES OF AIR

Air in a pressurized, operating pipeline comes from three

primary sources. First, prior to start-up, the line is notempty - it is full of air. To entirely fill a pipeline with fluid, it

is necessary to eliminate this air. As the line fills, much of

this air will be pushed downstream to be released through

hydrants, faucets, etc. But a large amount will become

trapped at system high points (Figure One). This

phenomenon will occur because air is lighter than water

and therefore, will collect at the high points. This air will

continuously be added to by the second and third sources

as the system continues operation.

Source number two is the water itself. Water contains

approximately 2% air by volume. During system operation,

the entrained air will continuously separate out of the water

and once again accumulate at system high points. To

illustrate the potential massive amount of air this 2%

represents, consider the following: A 1000 ft. length of

pipe could contain a pocket of air 20 ft. long if all the air

accumulated in one location. Or a one mile length of pipe

could contain a 100 ft. slug. This would be true regardless

of the diameter of the pipe.

The third source of air is that which enters throu

mechanical equipment (Figure Two). This includes

being forced into the system by pumps as well as air bei

drawn in through packing, valves, etc. under vacuu

conditions. As one can see, a pressurized pipeline is newithout air and typically the volume is substantial.

IMPACT OF AIR ON SYSTEM

Now that we have identified the air sources, let us consid

their impact on the system. Two problems are apparent. T

pocket(s) of air accumulating at a high point(s) can result

a line restriction (Figure Three). Like any restriction, t

Air collects at high points

Air collects at high points

Air bubbles raise to high point,

increasing in size

Air bubbles raise to high point,

increasing in sizeRestricted flow increa

velocity and head lo

FIGURE ONE

FIGURE THREE

FIGURE TWO

AIRAIR&

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pocket(s) of air increases headloss, extends pumping cycles

and increases energy consumption. The presence of air can

also promote corrosion of pipe and fittings. As air continues

to accumulate at system high points, the fluid velocity

increases as the fluid is forced through a smaller and

smaller opening.

As the pocket(s) grow, one of two phenomena will occur. The

first possibility is a total flow stoppage (Figure Four). If system

dynamics are such that the air cannot be continuously

trimmed (removed) by the increased fluid velocity and

pushed downstream, then this could happen. As the

pocket(s) continues to accumulate air, a pressure drop

higher than pump capacity can develop and stop all flow.

The second, and more likely occurrence, is that the

increased velocity will cause all, or part of, the pocket to

suddenly dislodge and be pushed downstream (Figure Five).

The sudden and rapid change in fluid velocity when thepocket dislodges and is then stopped by another high point,

can and often will, lead to a high pressure surge (water

hammer). Serious damage to valves, fittings, gaskets, or

even breakage of the line can occur. This is the most

serious of the possible consequences of air being allowed to

accumulate in system high points.

HISTORICAL SOLUTIONS

As we can see, air in a pressurized pipeline is a serious

concern. Obviously, it's removal will result in a more

efficient, cost effective operation and potentially avoid more

serious problems. In the early 1900's, engineers and water

works personnel started developing an understanding of the

problems associated with air and the search for a solution

was on. Some depended on standpipes, believing that a large

portion of the air would be expelled through them. Many

began placing gate or ball valves at system high points to

manually bleed off accumulated air. Unfortunately, it has

proved impossible to predict when it is time to bleed the air.

This proved impractical, especially on larger systems. Open

fire hydrants (Figure Six) are frequently used under the

assumption that all air in the pipeline will be released.

Unfortunately, hydrants are generally connected to the side of

Part of air pocket breaks

away, creating surge

FIGURE FIVE

Air in a pressurized pipeline is a serious concern. Obviously, it's removal will result in a moreefficient, cost effective operation and potentially avoid more serious problems.

FIGURE FOUR

Air Pocket

Distribution

LineButterfly Valve

FIGURE SIX

Hydrant

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the pipe, leaving air trapped at the top and at system high

points. It should be noted that there are still a few

municipalities using these methods!

THE AIR VALVE SOLUTION

Today, most municipalities utilize Automatic Air Valves.

They are available in many different designs and

configurations for a wide range of applications. Their

function is to automatically release and admit air without

operator assistance. Today, countless Air Valves are

performing this task around the globe on a daily basis.

Air Valves are available in three basic configuration

(Figure Seven) Air/Vacuum Valves, Air Release Valves a

Combination Valves. Correct sizing and location of all thr

types are critical (Figure Eight). Every high point grea

than one pipe diameter where the pipeline converts from

positive grade to a negative grade requires an air valv

Even minimal high points with small air pockets can cau

serious surge problems. In addition, it is recommend

that air valves be installed every half mile or 2500 feet straight horizontal runs.

AIR/VACUUM VALVES

FIGURE SEVEN

FIGURE EIGHT

FIGURE NINE

OPEN

Air exhausted during

pipeline fill

OPEN

Air enters during

pipeline draining

CLOSED

Pipeline under

pressure

Air Release Valve

Air/Vacuum

Valve

Combination

Air Valve

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Air/Vacuum Valves (Figure Nine), sometimes referred to as

"large orifice" valves, are used to exhaust large quantities of

air upon system start-up, as well as allowing air to re-enter

the line upon system shut down or system failure. As water

enters the valve, the float will rise, closing the discharge

port. The valve will remain closed until system pressure

drops to near zero psi. It will not open and release any

accumulation of air while the system is under pressure.

An added benefit of an Air/Vacuum Valve is its ability to

provide pipeline vacuum protection. If a negative pressure

develops, the valve will open, admitting air into the line,

preventing a possible pipeline collapse or intensified surges.

While Air/Vacuum Valves will exhaust large quantities of air

upon start-up, it should be remembered that they will not

continuously release air during system operation. For this

function, an Air Release Valve is required.

WELL SERVICE AIR VALVES

Well Service Air Valves (Figure Ten) are a member of the

Air/Vacuum Valve family. Vertical Turbine pump manufac-

turers recommend the use of Well Service Air Valves to

eliminate the introduction of air into the line by the pump.

They are specifically designed to vent air from the pump

column upon pump start-up, prior to the check valve opening.

Well Service Air Valves are equipped with Throttling Devices

and piped exhausts to control the rapid air discharge from

these valves. Val-Matic provides Dual Port Throttling

Devices (Figure Eleven) on 1/2 to 3 valves and Anti-Slam

on 4 and larger. The Throttling Device provides controlled

air discharge and full vacuum flow after pump shutdown

through a separate top port. With the Val-Matic Dual Port

Throttling Device, the vacuum flow does not need to flow

through the drain piping thereby eliminating the risk o

contamination of vacuum blockage.

AIR RELEASE VALVES

Unlike an Air/Vacuum Valve, an Air Release Valve (Figure

Twelve), sometimes referred to as a "small orifice" valve, wil

continuously release accumulated air during system

operation. As air from the pipeline enters the valve, i

displaces the water, allowing the float to drop. The air is

then released into the atmosphere through a small orifice

As the air is vented it is replaced by water, raising the float

and closing the valve orifice. As air accumulates, the valve

will continue to cycle in this manner to remove collected air

COMBINATION AIR VALVES

Combination Air Valves (Figure Thirteen) are the most com

monly used valves. They perform the functions of an

Air/Vacuum Valve (exhaust large quantities of air on start-up

FIGURE TWELVEFIGURE TEN

An added benefit of an Air/Vacuum Valve is its ability to provide pipeline vacuum protection. If anegative pressure develops, the valve will prevent a possible pipeline collapse.

FIGURE ELEVEN

Inlet

Controlled Air

Discharge

Full Vacuum Flow

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admit air on shut-down) and Air Release Valves (release air

continuously during operation). Combination Air Valves are

available in single body and dual body (an Air/Vacuum Valve

and Air Release Valve piped together) configurations. The

single body configuration is more compact and economical.

The dual body configuration provides two independent

valves so that if maintenance is being performed on the

air release valve, the air/vacuum valve is still protecting

the pipeline. The dual-body valve also provides a much

wider range of sizing options.

ANTI-SLAM COMBINATION AIR VALVES

Anti-Slam Combination Air Valves (Figure 14) are commonly

used on pipeline highpoints where rapid changes in flow

velocity or column separation may occur. Column separationis a serious phenomenon in a pipeline caused by the

formation of a vapor pocket at high points above the

hydraulic grade line after pump outages. The vapor pocket

rapidly collapses as the water columns rejoin causing

extreme surge pressures in the piping system. Anti-Slam

Valves provide pipelines with all the protection of a standard

combination air valve plus the additional feature of an

anti-slam, regulated closure device which prevents the air

valve from being slammed shut during critical operation. The

flow of water is throttled through the anti-slam device to a

degree that allows the air valve to fill at a controlled rate. By

controlling the air valve closure, a shock or water hamme

condition is prevented from occurring within the valve.

VACUUM BREAKER VALVES

For critical applications where vacuum protection is a must

or where column separation is predicted, a vacuum breake

(Figure 15) is used. The Vacuum Breaker is mounted a

critical pipeline high points, penstocks, or tanks and allows

for rapid inflow of atmospheric air through a screened hood

to reduce vacuum conditions in piping systems.

When positive pressure in the system is restored, the vacuum

breaker provides a positive synthetic seal to maintain systempressure. When equipped with an air release valve, the

vacuum breaker can be used to slowly exhaust the air tha

was admitted to the pipeline. The slow release of air prevents

the sudden rejoining of separated columns in a pipeline and

the associated pressure surges or water hammer.

SUMMARY

To summarize, when air is allowed to accumulate in

pressurized pipelines, efficiency is sacrificed and serious

damage can occur. A properly de-aerated pipeline will no

solve all surge problems; however, the elimination of air can

solve one of the most common causes. Air Valves are a cos

effective, reliable method of improving efficiency and

solving air related surge problems.

FIGURE THIRTEEN

FIGURE FIFTEEN

FIGURE FOURTEEN

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The Val-Matic Air Valve sizing program is an

easy to use Windows Computer Program for

locating and sizing Air Valves in Water and

Wastewater applications.

Provided system parameters, airValve will

calculate system data and develop criteria suchas flow rate due to slope. It will recommend valve

locations, sizes and models and print a valve

schedule with profile for the user. Finally, the

program will save your data for future reference.

Available online for download, or by requesting

a copy, the Val-Matic airValve Sizing Software

is an indispensible, free resource that allows

engineers to more effectively, and more easily,

design their pipeline.

From the float material to the shape

of the body, Val-Matic Air Valves

are designed for years of reliable

performance. All valves meet AWWA

C512 requirements.

HEAVY DUTYSTAINLESS STEEL

Stainless steel type 316 is the standard of

Water & Wastewater facilities throughout

the world when quality and longevity

count. That is the reason Val-Matic

uses type 316 stainless steel in every

internal component in every Air Valve

we make. From nuts to floats, it's all

you'll find inside Val-Matic Air

Valves. The only exception is the

resilient sealing member. Our

sealing members use a variety of

synthetic compounds to assure a tight seal

from the lowest system pressures to the

valve's maximum rated working pressure.

The float is the heart of an Air Valve. One

pinhole or nick in the float's sealing surface

will cause premature failure. That's why

Val-Matic starts with heavy-duty type 316

stainless steel and uses it exclusively

throughout our line. Val-Matic unconditionally

guarantees all air valve floats.

Providing a quality float is not enough to

assure a good seal every time. When

entering the seat, a damaged or off-center

float will prevent a valve from closing. The

high velocities that Air/Vacuum valves are

exposed to can cause unguided floats to be

violently tossed about from side to side and

continuously thrust against the valve body.

For these reasons, all Val-Matic Air/ Vacuum

Valve floats are center guided.

Center guiding guarantees that the

float approaches the seat at a

90 angle to provide a positive

drop tight seal each time.

Round stainless steel bushings

position the hexagonal guides and

hold them firm. The use of hexagonal

guides in round bushings prevents

binding and allows for self-cleaning

of the bushings.

SEATS

All standard models incorporate a resilient

sealing member which mates to stainless

steel. Air Release Valves have a synthetic

sealing member mounted to the float

linkage mechanism. It closes against a

stainless steel seat mounted in the valve

cover. On Air/Vacuum Valves, the stainless

steel float closes against a synthetic seat

mechanically retained in the body. The

patented resilient seat provides positive shut

off from the lowest system pressure to the

valves rated working pressure.

AIR/VACUUM INLETSAND OUTLETS

When is a two-inch hole smaller than a

two-inch hole? When you buy an Air/Vacuum

valve with inlets and outlets of different

diameters. A two-inch Air/Vacuum Valve with

a one-inch outlet orifice has the effective

capacity of only a one-inch

Air/Vacuum Valve. Put simply,

no one can put more than a

gallon of water in a gallon

container. No one can push

more air through a one-inch

hole than its size is capable of

allowing.

That's why check valve and shut-off valve

manufacturers strive to maintain full pipe

diameter through the valve body. A loss of

efficiency occurs when you restrict flow

through the valve. In the case of an

Air/Vacuum valve, it can lead to serious

consequences if the valve is not capable of

relieving a vacuum condition due to restricted

flow. For this reason, all Val-Matic

Air/Vacuum valve outlets are greater or

equal to the valve's nominal size.

Val-Matic has expertise and experience inproviding global solutions to air related

concerns coupled with quality products.

That is why Val-Matic is the world leader in

air valve technology!

Exclusive Features and Benefits

SizingSoftware

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W

astewater Air Valves are designed for non-clog

operation. The body is extended to keep the

media away from the operating mechanism.

The body is also expanded and sloped at the bottom to help

prevent clogging. Val-Matic provides a minimum 2" inlet and

2 cleanout on all wastewater air valves to facilitate the

passage of solids.

While all of these design initiatives help, they do not

completely eliminate the problem of wastewater build up

inside the valve, especially in collection systems containing a

high grease content from food and drink establishments. It

should be noted that all wastewater air valves experience

wastewater and grease buildup problems. Therefore, it isrecommended that the specifier consider one or more of the

following options when purchasing wastewater air valves.

COATINGS

Two optional coatings are available to minimize the build up of

sewage on the inside of the valve. The first is fusion bonded

epoxy. Used extensively in the municipal Water & Wastewater

industry it is extremely durable and holds up well to the

abrasive nature of wastewater. The coating minimizes the

buildup of grease and sewage on the interior walls of the valve.

The second coating available is a special Teflon coating

developed by Val-Matic that performs extremely well in

wastewater and does an excellent job of minimizing buildup.

This option should be considered when high concentrations of

grease are present.

BACKWASHING ON SITE

In most wastewater systems, backwashing will be necessa

The frequency will be determined by whether or not the inte

of the valve has been coated, the turbidity of the flow, a

grease content. Backwash kits contain the fittings, shut

valves and rubber hose necessary to complete the job. A

clean water supply of at least 30 psi is needed at the site.

BACKWASHING OFF SITE

For those installations where backwashing on site is

practical or desirable, a final option is to establish a va

rotation program. The program provides for schedu

backwashing of all valves in the system. A backwashed va

replaces one requiring service. The valve to be serviced

taken back to the shop, placed in a backwash rig and clean

It is then ready to replace the next valve scheduled. The va

rotation program also provides the benefit of a backup valve

the unlikely event one should ever fail.

Wastewater Features & Benefits

Air Release Valve with Backwash Accessories

Dual Body Combination Air Valve w/Backwash Acc.

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The wide range of air related

concerns in pipeline and

treatment plant design require a

multitude of solutions. With the broadestline of air valves available coupled with

Engineering expertise and Manufacturing

experience, Val-Matic is the number one

source for solutions to air related issues.

The following are a few of the basic valve

applications and the solutions Val-Matic

can provide.

EFFICIENCY ANDVACUUM PROTECTION

The primary purpose of air valves is to provide

pipeline efficiency by continuous removal ofair at pipeline highpoints and vacuum

protection by admitting large quantities of air

upon pump shut down or system failure.

SURGE PROTECTION

Less recognized is the use of air in

pipelines to control or reduce surges.

Surges result from sudden changes in the

velocity of the pipeline fluid that occur

regularly due to pump start up and shut

down. The effects of surges can be

devastating. Surges are typically equal to

approximately 50 psi for every 1 ft/sec of

rapid change in flow velocity. This is added

to the pipeline static pressure. Through

computer modeling and transient analysis

it has been shown that air and air valves

can play a critical roll in preventing and

controlling pipeline surges.

LINE SURGES

Power/system failures can

often result in a column of

water separating at high points

in the line. As mentioned previously, to

prevent a vacuum from forming an

Air/Vacuum Valve admits large quantities of

air into a pipeline. However, allowing the twocolumns of fluid to come back together

uncontrolled can cause a tremendous

surge. Air is used to prevent a vacuum; using

either an anti-slam device or a regulated

exhaust device in conjunction with a

Combination Air Valve air can be used to

prevent a surge. Both devices will regulate

the exhausting of air while leaving enough

air to cushion the impact of the two columns

of fluid when they collide. Another solution

is to use a Vacuum Breaker with an Air

Release valve. While the vacuum breaker

provides unimpeded air flow for vacuumprotection, the small orifice of the Air

Release valve will slow the exhausting of air

leaving behind a cushion to soften the

impact when the two columns collide.

PUMP COLUMN SURGES

Full velocity rapidly develops in a pump

column when a vertical turbine pump starts

against a closed check valve. A power actuated

check valve must absorb the full force of the

impending impact. A mechanical check valve

will open, relieving a portion of the force butwill take a beating. As discussed, the best way

to prevent extreme surges in the pump column

and connecting piping is to control the

discharge of air upon pump start up. For

systems with mechanical check valves a Well

Service Air Valve with a Throttling, or Anti-Slam

device is used. The air is rapidly

vented at 2-5 psi from the pump

column at a controlled rate so

that all or most of the air escapes

just before the force of the pump

pressure opens the

check valve. For systems with power actuated

check valves, a Well Service Air Release

Valve is used. The valve orifice is sized to

control the rise of water in the pump columnat a reasonable velocity such as 2ft/sec. The

valve vents air at the full pump pressure fo

a given period of time after which the contro

valve is signaled to open. The control valve

opens after the Air Release valve vents air at

the full pump pressure for any given time

(See Val-Matic technical paper AEG-302.)

LOOK TO VAL-MATICFOR SOLUTIONS!

Engineering excellence....Manufacturing

experience.A broad line of valves. No

wonder Engineers and system operators

look to Val-Matic for solutions.

Basic Applications and Solutions

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Applications, Functions, Purpose, and Features

Val-Matic A

Valves ful

comply wit

ANSI/AWWC512.

x

The following technical papers are available for additional information:

Theory, Application, and Sizing of Air Valves; as well as Air Valves for Fire Protection.

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WATER & WASTEWATERAIR RELEASE VALVES

Val-Matic Air Release Valves maintain your pipelines

efficiency. Trapped pockets of air that accumulate in your

pipeline will lower your flow rates and increase surges. An Air

Release Valve that automatically releases these pockets of

air is an inexpensive and safe way to protect your line and

improve its value. As the flow decreases in a pipeline, the

pumps are forced to work harder and are less efficient;

ultimately this could result in a total system blockage. Air

Release Valves protect your line with minimal maintenance

or management. Unconditionally guaranteed stainless Steel

floats housed in rugged cast bodies assure that your line is

protected. The operation of an efficient line requires the use

of an Air Release Valve.

MATERIALS OF CONSTRUCTIONStandard Optional

Body and CoverCast Iron, ASTM A126 Class B

< 300 psig

Cast Steel, ASTM A216 Grade WCB

Stainless Steel, ASTM A351 Grade CF8M

Ductile Iron, ASTM A536

Trim Type 316 Stainless Steel --

Coating Universal Alkyd Primer Fusion Bonded Epoxy

Venting Capacity for Air Release Valve Orifice Sizes

OPTIONS:Vacuum Check

Outlet Hoods

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WATER AIR RELEASE VALVES

ModelNumber

ValveSize

InletSize

OutletSize NPT

CWPPSI

Orifice Size DimensionsA B

15A 1/2 1/2 1/2 175 1/16 4 3/4 5 1/4

15A.2 3/4 3/4 1/2 175 1/16 4 3/4 5 1/4

15A.3 1 1 1/2 175 1/16 4 3/4 5 1/4

22.3 1 1 1/2 175 3/32 5 1/8 6

22.4 1/2 - 3/4 3/4 1/2 175 3/32 5 1/8 6

22.7 1/2 1/2 1/2 300 1/16 5 1/8 6

22.9 1/2 - 1 1 1/2 300 1/16 5 1/8 6

25.5 1 1 1/2 150 1/8 6 1/8 7

25.6 3/4 - 1 1 1/2 300 3/32 6 1/8 7

38 1 1 1/2 150 3/16 7 1038.2 2 2 1/2 150 3/16 7 10

38.5 1 1 1/2 300 5/32 7 10

38.6 2 2 1/2 300 5/32 7 10

45 2 2 1 150 23/64 9 1/2 12 1/4

45.2 3 3 1 150 23/64 9 1/2 12 1/4

45.5 2 2 1 300 7/32 9 1/2 12 1/4

45.6 3 3 1 300 7/32 9 1/2 12 1/4

50 2 2 1 500 7/32 10 7/8 13

50HP 2 2 1 1000 1/8 10 7/8 13

WASTEWATER AIR RELEASE VALVES

ModelNumber

ValveSize

InletSize NPT

OutletSize NPT

CWPPSI

Orifice Size DimensionsA B

48A 2 2 1/2 150 3/16 7 15 5/16

48A.2 3 3 1/2 150 3/16 7 15 5/16

48A.4 2 2 1/2 75 5/16 7 15 5/16

48A.5 3 3 1/2 75 5/16 7 15 5/16

49A 2 2 1 150 7/16 9 1/2 17 9/16

49A.2 3 3 1 150 7/16 9 1/2 17 9/16

49A.4 2 2 1 75 1/2 9 1/2 17 9/16

49A.5 3 3 1 75 1/2 9 1/2 17 9/16

WASTEWATER AIR RELEASE VALVES W/ BACKWASH ACCS.

Model

Number

Valve

Size

Inlet

Size NPT

Outlet

Size NPT

CWP

PSIOrifice Size

Dimensions

A B

48ABW 2 2 1/2 150 3/16 10 1/2 23 5/16

48A.2BW 3 3 1/2 150 3/16 10 1/2 26 13/16

48A.4BW 2 2 1/2 75 5/16 10 1/2 23 5/16

48A.5BW 3 3 1/2 75 5/16 10 1/2 26 13/16

49ABW 2 2 1 150 7/16 14 26 1/16

49A.2BW 3 3 1 150 7/16 14 29 9/16

49A.4BW 2 2 1 75 1/2 14 26 1/16

49A.5BW 3 3 1 75 1/2 14 29 9/16

INSTALLATION DIMENSIONS/ORIFICE SIZES

15A - 50HP

Air Release Valve

48A - 49A.5Wastewater Air Release Va

48ABW - 49A.5BW

Wastewater Air Release Val

w/BWA

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Val-Matics dual feature Air/Vacuum valve protects your

pipeline from the damaging and expensive effects of air.

When filling your line, large quantities of air are exhausted

through an Air/Vacuum Valve maximizing your fluid levels.

Less air means more space available for fluid. An

Air/Vacuum valve responds to the loss of pressure during

intentional drains, power failures, and pipe bursts. The valve

allows air to re-enter a system, which, equalizes the pressure

and lessens the vacuum that causes pipeline collapses and

intensifies surges.

OPTIONS:Vacuum Check Kits Threaded and Flanged Outlets

Threaded Hoods Hooded Outlets

Anti-Slam Device

WATER & WASTEWATERAIR/VACUUM VALVES

MATERIALS OF CONSTRUCTION

Standard Optional


Class 125 and 250

Ductile Iron, ASTM A536 Grade 65-45-12


Trim Type 316 Stainless Steel -


FLOW CAPACITY OF AIR/VACUUM VALVES

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WATER & WASTEWATERAIR/VACUUM VALVES

WATER AIR/VACUUM VALVES

Model

Number

Valve

Size

Inlet

Size

Outlet

Size

CWP

PSI

Dimensions

A B

100S 1/2 1/2 NPT 1/2 NPT 300 6 1/8 7

101S 1 1 NPT 1 NPT 300 7 9 1/2

102S 2 2 NPT 2 NPT 300 9 1/2 12

103S 3 3 NPT 3 NPT 300 9 1/2 12

WATER AIR/VACUUM VALVES

ModelNumber

ValveSize

InletSize

OutletSize

CWPPSI

Dimensions

A B

104S

154S4 4 Flg. 4 NPT

125lb - 150

250lb - 30012 17

106156

6 6 Flg. 6 Hood 125lb - 150

250lb - 30014 20

108

1588 8 Flg. 8 Hood

125lb - 150

250lb - 30018 23

110

16010 10 Flg. 10 Hood

125lb - 150

250lb - 30020 26

112

16212 12 Flg. 12 Hood

125lb - 150

250lb - 30024 31

114

16414 14 Flg. 14 Hood

125lb - 150

250lb - 30027 34

116

16616 16 Flg. 16 Hood

125lb - 150

250lb - 30030 1/2 34

120

17020 20 Flg. 20 Hood

125lb - 150

250lb - 30038 1/4 36 1/4

WASTEWATER AIR/VACUUM VALVES

ModelNumber

ValveSize

InletSize

OutletSize

CWPPSI

Dimensions

A B

301A 1 1 NPT 1 NPT 150 7 15 1/16

302A 2 2 NPT 2 NPT 150 9 1/2 17 7/16

303A 3 3 NPT 3 NPT 150 9 1/2 17 7/16

304 4 4 Flg. 4 NPT 150 11 1/2 36 1/2

306 6 6 Flg. 6NPT 150 14 36 1/2

308 8 8 Flg. 8 Flg. 150 18 41 1/4

WASTEWATER AIR/VACUUM VALVES W/ BACKWASH ACCESSORIES

ModelNumber

ValveSize

InletSize

OutletSize

CWPPSI

Dimensions

A B

301ABW 2 x 1 2 NPT 1 NPT 150 10 1/2 23 1/16

302ABW 2 x 2 2 NPT 2 NPT 150 14 24 7/16

303ABW 3 x 3 3 NPT 3 NPT 150 14 29 7/16

304BW 4 4 Flg. 4 NPT 150 17 45 1/2

306BW 6 6 Flg. 6 NPT 150 20 47

308BW 8 8 Flg. 8 Flg. 150 23 53

100S - 103S

Air/Vacuum

Valves

104S - 170

Air/Vacuum

Valves

301A - 308

Wastewate

Air/Vacuum

Valve

301ABW - 308

Wastewater

Air/Vacuum Va

w/BWA

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Designed to bring together the features of an Air Release

and Air/Vacuum Valve, Combination Air Valves give you the

maximum of pipeline protection and efficiency. For highcapacity venting of air during pipeline filling the

Air/Vacuum feature maximizes your fluids flow area. An

Air/Vacuum valve also forces air back into a system. This

pressurizes the pipeline and avoids a destructive vacuum

that occurs during draining or pipe bursts. Trapped pockets

of air that travel through a pipeline system are exhausted

through Air Release Valves. These pockets collect at high

points and limit your fluids flow rate. That forces your pump

to work harder which increases your cost. Combination

Valves combine the traditional and proven features of both

the Air Release and Air Vacuum valve.

OPTIONS:Outlet Hoods

Backwash Accessories

Isolation Valves

6

WATER & WASTEWATERCOMBINATION AIR VALVES


Standard Optional


Class 125 and 250

Ductile Iron, ASTM A536 Grade 65-45-12




FLOW CAPACITY OF COMBINATION AIR VALVES

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WATER COMBINATION AIR VALVES (SINGLE BODY)

Model

Number

Valve

Size

Inlet

Size

Outlet

Size

CWP

PSIOrifice Size

Dimensions

A B

201C.2 1 1 NPT 1 NPT 300 5/64 11 3/8 10 1/2

202C.2 2 2 NPT 2 NPT 300 3/32 14 13

203C.2 3 3 NPT 3 NPT 300 3/32 16 15

204C.2 4 4 NPT 4 NPT 300 3/32 18 1/2 17

203C.14 3 3 125lb Flg. 3 NPT 150 3/32 16 17

204C.14 4 4 125lb Flg. 4 NPT 150 3/32 18 1/2 19

203C.15 3 3 250lb Flg. 3 NPT 300 3/32 16 17 1/2

204C.15 4 4 250lb Flg. 4 NPT 300 3/32 18 1/2 19 1/2

206C 6 6 125lb Flg. 6 Hood 150 3/8 21 20 1/4

256C 6 6 250lb Flg. 6 Hood 300 7/32 21 20 1/4

208C 8 8 125lb Flg. 8 Hood 150 3/8 25 23 1/2

258C 8 8 250lb Flg. 8 Hood 300 7/32 25 23 1/2

WATER COMBINATION AIR VALVES (DUAL BODY)

Model

Number

Valve

Size

Inlet

Size

Outlet

Size

CWP

PSI Orifice Size

Dimensions

A B

101S/22.9 1 1 NPT 1 NPT 300 1/16 7 7/8 15 5/8

102S/22.9 2 2 NPT 2 NPT 300 1/16 10 1/4 17 7/8

103S/22.9 3 3 NPT 3 NPT 300 1/16 10 1/4 18 1/4

201C.2 - 204C.15

Combination Air Valve

206C - 258C

Single Body


101S/22.9 - 103S/22.9

Dual Body Combination

Air Valve

Anti-Slam Combination Air Valves and Isolation Valves in a pump discharge application.

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WATER COMBINATION VALVES (DUAL BODY)

Model

Number

Valve

Size

Inlet

Size

OutletSize

Air/Vacuum

CWP

PSI

Orifice Size

Air Release

Dimensions

A B

104S/38

154S/38.54 4 Flg. 4 NPT

125lb - 150

250lb - 300

3/16

5/3221 22

106/38

156/38.56 6 Flg. 6 Hood

125lb - 150

250lb - 300

3/16

5/3224 23

108/38

158/38.58 8 Flg. 8 Hood

125lb - 150

250lb - 300

3/16

5/3227 26

108/45

158/45.58 8 Flg. 8 Hood

125lb - 150

250lb - 300

23/64

7/3230 29

110/38

160/38.510 10 Flg. 10 Hood

125lb - 150

250lb - 300

3/16

5/3230 28

110/45

160/45.5 10 10 Flg. 10 Hood

125lb - 150

250lb - 300

23/64

7/32 33 31

112/38

162/38.512 12 Flg. 12 Hood

125lb - 150

250lb - 300

3/16

5/3233 32

112/45

162/45.512 12 Flg. 12 Hood

125lb - 150

250lb - 300

23/64

7/3237 34 1/2

114/38

164/38.514 14 Flg. 14 Hood

125lb - 150

250lb - 300

3/16

5/3236 34

114/45

164/45.514 14 Flg. 14 Hood

125lb - 150

250lb - 300

23/64

7/3240 36

116/38

166/38.516 16 Flg. 16 Hood

125lb - 150

250lb - 300

3/16

5/3239 34

116/45

166/45.516 16 Flg. 16 Hood

125lb - 150

250lb - 300

23/64

7/3244 37

WASTEWATER COMBINATION AIR VALVES (SINGLE BODY)Model

Number

Valve

Size*

Inlet

Size

Outlet

Size

CWP

PSIOrifice Size

Dimensions

A B

801A 2x1 2 NPT 1 NPT 150 1/8 7 14 15/16

802A 2x2 2 NPT 2 NPT 150 9/64 9 1/2 18 1/16

803A 3x3 3 NPT 3 NPT 150 11/64 11 23 1/2

804 4x4 4 NPT 4 NPT 150 11/64 11 23 1/2

WASTEWATER COMBINATION AIR VALVES (DUAL BODY)

Model

Number

Valve

Size*

Inlet

Size

Outlet

Size

CWP

PSIOrifice Size

Dimensions

A B

48A/301A 2x1 2 NPT 1 NPT 150 3/16 20 20 5/16

48A/302A 2x2 2 NPT 2 NPT 150 3/16 20 3/4 25 3/4

49A/302A 2x2 2 NPT 2 NPT 150 7/16 20 3/4 22 3/4

48A/303A 3x3 3 NPT 3 NPT 150 3/16 21 1/2 28 1/4

49A/303A 3x3 3 NPT 3 NPT 150 7/16 21 1/2 24 3/4

48A/304 4X4 4 Flg. 4 NPT 150 3/16 20 3/4 36 1/2

49A/304 4x4 4 Flg. 4 NPT 150 7/16 20 3/4 36 1/2

48A/306 6x6 6 Flg. 6 NPT 150 3/16 23 1/4 36 1/2

49A/306 6x6 6 Flg 6 NPT 150 7/16 23 1/4 36 1/2

48A/308 8X8 8 Flg. 8 Flg. 150 3/16 25 3/4 41 1/4

49A/308 8x8 8 Flg. 8 Flg. 150 7/16 27 1/2 41 1/4

104S/38 - 166/45.5

Dual Body Combination

Air Valve

801A - 804

Wastewater

Single Body Combination

Air Valve

48A/301A - 49A/303A

Dual Body Wastewater


48A/304 - 49A/308


Combination Air Valve* Inlet x Outlet

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WASTEWATER COMBINATION AIR VALVES W/ BWA (SINGLE BODY)

ModelNumber

ValveSize

InletSize

Outlet

Size

Air/Vacuum

CWPPSI

OrificeSize

DimensionsA B

801ABW 2x1 2 NPT 1 NPT 150 1/8 10 1/2 23 1/16

802ABW 2x2 2 NPT 2 NPT 150 9/64 14 23 9/16

803ABW 3x3 3 NPT 3 NPT 150 11/64 16 30 1/2

804BW 4x4 4 NPT 4 NPT 150 11/64 16 33

WASTEWATER COMBINATION AIR VALVES W/BWA (DUAL BODY)

Model

Number

Valve

Size

Inlet

Size

Outlet

Size

Air/Vacuum

CWP

PSI

Orifice

Size

Dimensions

A B

48A/301ABW 2x1 2 NPT 1 NPT 150 3/16 28 1/4 22 13/16

48A/302ABW 2x2 2 NPT 2 NPT 150 3/16 29 1/2 24 1/249A/302ABW 2x2 2 NPT 2 NPT 150 7/16 35 32

48A/303ABW 3x3 3 NPT 3 NPT 150 3/16 35 28 1/2

49A/303ABW 3x3 3 NPT 3 NPT 150 7/16 35 32

48A/304BW 4x4 4 Flg. 4 NPT 150 3/16 34 46

49A/304BW 4x4 4 Flg. 4 NPT 150 7/16 34 46

48A/306BW 6x6 6 Flg. 6 NPT 150 3/16 36 47

49A/306BW 6x6 6Flg. 6 NPT 150 7/16 36 47

48A/308BW 8x8 8 Flg. 8 Flg. 150 3/16 39 53

49A/308BW 8x8 8 Flg. 8 Flg. 150 7/16 39 53

801ABW - 804BW

Single Body Wastewater


48A/301ABW - 49A/303ABW



48A/304BW - 49A/308BW


Combination Air ValveAir Valves are commonly found in plant service as well as pipelines

for efficiency and protection.

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ANTI-SLAMCOMBINATION AIR VALVES

Anti-Slam Combination Air Valves (CAV) are equipped with an Anti-

Slam Device which controls the flow of water into the air valve to

educe surges. This style of air valve provides pipelines with all of the

protection of a standard CAV plus the additional feature of regulated

closure which prevents the CAV from being slammed shut during

critical operation. By thus preventing the rapid closure of the valve,

a shock or water hammer condition is prevented from occurring

within the valve and possibly causing damage to the pipeline or valve.

When equipped with an Anti-Slam Device, the sizing differential

pressure may be as high as 5 PSI (35 kPa) as opposed to the typical

2 PSI (14 kPa), thus resulting in the selection of a smaller valve.

The Anti-Slam Device is mounted on the inlet of the CAV. It allows air to

pass through it unrestricted during either the air discharge or air re-entry

cycle. When water (because of its greater density) enters the Anti-Slam

Device, the disc will rapidly close and provide for slow closure of the

float. The disc contains ports which allow water to flow through the anti

slam device when closed to fill the CAV with water at a controlled rate.

The flow area of the anti-slam disc ports is typically about 5% of the full

port area and is adjustable by adding threaded plugs to the ports.


COMPONENT STANDARD OPTIONAL

Body Cast Iron ASTM A126 Class B Ductile Iron ASTM A536 Gr. 65-45-12

Trim Bronze ASTM B584, C83600 Stainless Steel ASTM A351, Grade CF8M

Exterior Coating Universal Primer Fusion Bonded Epoxy

FLOW CAPACITY OF ANTI-SLAM COMBINATION AIR VALVES

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ANTI-SLAMCOMBINATION AIR VALVES

ANTI-SLAM COMBINATION AIR VALVES (SINGLE BODY)ValveSize

Model Number Inlet Size CWP (PSI) Orifice SIze A B

1 1201T/201C.2 1 NPT 250 5/64 11 3/8 13 5/8

2 1202T/202C.2 2 NPT 250 3/32 14 17 1/4

3 1203/203C.2 3 125LB Flg. 300 3/32 16 23

4 1204/204C.2 4 125LB Flg. 300 3/23 18 1/2 26 1/4

61206/206C 6 125LB Flg. 150 3/8 21 30

1256/256C 8 250LB Flg. 300 7/32 21 30

81208/208C 6 125LB Flg. 150 3/8 25 36

1258/258C 8 250LB Flg. 300 7/32 25 36

ANTI-SLAM COMBINATION AIR VALVES (DUAL BODY)ValveSize

Model Number Inlet Size CWP (PSI) Orifice SIze A B

1 1201T/101S/38.5 1 NPT 300 5/32 14 1/2 16 1/2

2 1202T/102S/38.5 2 NPT 300 5/32 16 1/2 22 1/43 1203T/103S/38.5 3 125LB Flg. 300 5/32 26 3/4 16 3/4

41204/104S/38 4 125LB Flg. 150 3/16 21 29

1254/154S/38.5 4 250LB Flg. 300 5/32 21 29

61206/106/38 6 125LB Flg. 150 3/16 22 1/2 33

1256/156/38.5 6 250LB Flg. 300 5/32 22 1/2 33

81208/108/38 8 125LB Flg. 150 3/16 27 38

1258/158/38.5 8 250LB Flg. 300 5/32 27 38

101210/110/45 10 125LB Flg. 150 23/64 33 47

1260/160/45.5 10 250LB Flg. 300 7/32 33 47

121212/112/45 12 125LB Flg. 150 23/64 37 48 1/2

1262/162/45.5 12 250LB Flg. 300 7/32 37 48 1/2

141214/114/45 14 125LB Flg. 150 23/64 40 50

1264/164/45.5 14 250LB Flg. 300 7/32 40 50

161216/116/45 16 125LB Flg. 150 23/64 44 54

1266/166/45.5 16 250LB Flg. 300 7/32 44 54

201220/120/45 20 125LB Flg. 150 23/64 51 3/4 59 7/8

1270/170/45.5 20 250LB Flg. 300 7/32 51 3/4 59 7/8

1201T/201C.2 - 1202/202C

Anti-Slam Single Body


1203/203C.2 - 1204/204C

Anti-Slam Single Body


1204/104S/38 - 1270/170/45.5

Anti-Slam Dual Body


1201T/101S/38.5 - 1203T/103S/38.5

Anti-Slam Dual Body


1206/206C - 1258/258C

Anti-Slam Dual Body


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Vertical pumps have an air-filled discharge column when not

running. A well pump is typically submerged several hundred

feet and isolated from the pipeline by a check valve mounted

at ground level. When the pump is off, the water level in the

well drops to its static level allowing a large column of air to

collect in the pump column. In the absence of an air valve, the

air in the pump column would be pressurized upon pump start

up and forced through the check valve into the pipeline

causing air related problems. All vertical pumps should have

a Well Service Air Valve installed just

upstream of the check valve.

MATERIALS OF CONSTRUCTIONStandard Optional

Body and

Cover

Cast Iron ASTM A126, Class B

Class 125 and 250

Ductile Iron ASTM A536

Grade 65-45-12, Class 300

Stainless Steel, ASTM

A351 Grade CF8M



WELL SERVICE AIR VALVE SIZING

VALVE

SIZE

NO HEAD PUMP

CAPACITY, GPM

MODEL NUMBER

150 PSI MODEL 300 PSI MODEL

1/20 - 200 100WS

0 - 350 100ST

1201 - 500 101WS

351 - 1,350 101ST

2 501 - 1,200 102WS1,351 - 4,000 102ST

31,201 - 2,000 103WS

4,001 - 7,000 103ST

4 7,001 - 11,000 104WS 154WS

6 11,001 - 24,000 106WS 156WS

8 24,001 - 50,000 108WS 158WS

10 50,001 - 70,000 110WS 160WS

12 70,001 - 110,000 112WS 162WS

The purpose of the Throttling Device is to slow the

release of air and thereby slow the rise of water in the

pump column. Dual Port Throttling Devices are standard

on Well Service valves sizes 1/2 - 3 and optional on

larger valves when valve closure is rapid.

A Throttling Device has an exhaust disc which is typically

adjusted between 5% and 30% open to control the

venting rate. The valve needs to be set in the field and

tuned to the operation of the pump. The Throttling

Device should be opened just enough so that all of the

air is discharged before the check valve opens. Opening

the Throttling Device further will increase the pressure

surge in the pump column.

The Throttling Device also allows air to re-enter the pumpcolumn when the pump is stopped to prevent a vacuum. A

vacuum can damage the seals in the pump or cause pump

damage if it is restarted while the water is still dropping in

the well. To provide positive assurance against a vacuum,

a Dual Ported Throttling Device is needed where the

vacuum port is separate from the exhaust port.

If there is a common outlet, then the vacuum flow will be

greatly restricted through the air discharge pipe. The

vacuum flow could also be stopped or contaminated if

the air discharge pipe becomes submerged in a drain or

a high wet well level. A Dual Port Throttling Device

should be used at all times.

DUAL PORTTHROTTLING

DEVICE

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Well Service Air Valve

w/ Dual Port Throttling Device

Model

Number

Valve

Size

Inlet

Size

Outlet

SIze

CWP

PSI

Dimensions

A B

100ST 1/2 1/2 1/2 NPT 300 6 1/8 11 3/4

101ST* 1 1 1 NPT 300 7 14 3/4

102ST* 2 2 2 NPT 300 9 1/2 20 1/8

103ST* 3 3 3 NPT 300 9 1/2 22 1/8

Well Service Air Valve with Anti-Slam

Valve

Size

Model

NumberInlet Size Outlet Size

CWP

PSIA B

4104WS

154WS

4 125lb Flg.

4 250lb Flg.4NPT

150

30011 1/2 22 3/4

6106WS

156WS

6 125lb Flg.

6 250lb Flg.6 NPT

150

30014 28 1/2

8108WS

158WS

8 125lb Flg.

8 250lb Flg.8 125lb Flg.

150

30017 1/4 35 5/16

10110WS

160WS

10 125lb Flg.

10 250lb Flg.10 125lb Flg.

150

30020 1/4 40 1/16

12112WS

162WS

12 125lb Flg.

12 250lb Flg.12 125lb Flg.

150

30024 44 5/16

*UL Listed


100ST - 103ST


104WS - 162WS


DESIGN FEATURES

The 1/2 - 3 threaded inlet valves are equipped with a dual port

throttling device. The flanged inlet valves 4 and larger are equipped

with an anti-slam device. It is recommended that for in plant

installations the threaded discharge of the valve be piped to a drain

to accommodate any small amount of water that may be discharged

from the valve on closure. An optional well screen (WS) is available

to further dissipate the water velocities in the valve (sizes 1/2 - 3.)

WELL SERVICE AIR VALVE OPERATION

Well Service Air Valves are similar to Air/Vacuum Valves and are

designed to exhaust air on pump start-up and admit air upon pump

shut down. The valve is a normally open, float-operated valve that

vents or admits air at high rates. When water enters the valve, thefloat automatically rises and closes to prevent discharge of the water.

As the last of the air is vented, water simultaneously strikes the air

valve and the closed check valve. If the flow velocity is high enough,

surges will occur in the pump column and discharge pipe. Anti-Slam

Devices and Throttling Devices are provided to control the rate of air

release and minimize surges, especially with slow opening, contro

type check valves and to protect the Air Valve from pressure surges.

WELL SERVICE AIR VALVE INSTALLATION

Pump service is a severe application for air valves. The Well Service

Air Valve is installed at ground level upstream of the check valve

When the pump is started, it runs for the first few seconds against lit

tle or no head. Hence, the actual flow rate can be as high as 150%

of the normal flow rate while the air is being vented. Because of the

dynamics involved, the air discharge is sonic and can cause water to

bypass the rapidly closing air valve. Therefore, the valve outlet should

be piped back to the wet well or an open drain.

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Val-Matic Vacuum Breaker Valves protect and maintain a

pipeline's structural integrity during vacuum conditions.

Vacuums created by power failures, line breaks, and

pressure surges are broken by the admission of large

quantities of air through a Vacuum Breaker Valve. These

vacuums are strong enough to collapse pipelines and

storage tanks. They also have the potential to draw

contaminates into the system through pipes and valves.

When coupled with an Air Release Valve, large pockets of air

are admitted into a line then slowly released through the

Release Valve. This creates a cushioning effect during surge

conditions limiting the impact the fluid has on a pipe

system. These valves can also be used to supplement

conventional Air/Vacuum valves when conditions require

greater intake capacity than exhaust capacity.


MATERIALS OF CONSTRUCTION CHART

Material Standard Optional

Body and Cover

ASTM A126

Class B Cast Iron

Class 125 and 250

Ductile Iron

ASTM A536 Grade 65-45-12

TrimBronze, ASTM B584,

C83600

Stainless Steel ASTM A351,

Grade CF8M


VENTING CAPACITY FOR VACUUM BREAKERS

FEATURES:

FULL FLOW AREA

SIZES 2 - 24

ANSI FLANGED CONNECTION

HOODED OR FLANGED AIR INLET

RESPONDS TO .25 P.S.I. PRESSURE DIFFERENTIAL

POSITIVE SYNTHETIC SEATING AT ALL WORKING

PRESSURES

OPTIONS:Flanged Outlet

Air Release Valve

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VACUUM BREAKER WITH AIR RELEASE VALVE

VALVE

SIZE

MODEL NUMBERA B

125 LB. CLASS (CWP) 250 LB. CLASS (CWP)

3 1803VB/38 150 1853VB/38.5 300 16 15

4 1804VB/38 150 1854VB/38.5 300 17 3/8 15 7/8

5 1805VB/38 150 1855VB/38.5 300 18 3/4 16 3/4

6 1806VB/38 150 1856VB/38.5 300 20 17 1/4

8 1808VB/38 150 1858VB/38.5 300 22 3/4 18 1/4

10 1810VB/38 150 1860VB/38.5 300 25 5/8 19 3/4

12 1812VB/38 150 1862VB/38.5 300 28 3/4 19 1/8

14 1814VB/38 150 1864VB/38.5 300 30 7/8 19 7/8

16 1816VB/38 150 1866VB/38.5 300 33 3/4 21

VACUUM BREAKER PRESSURE/TEMPERATURE RATING

MAXIMUM NON-SHOCK PRESSURE, psig

MAXIMUM TEMPERATURE 150 F

ANSI CLASS 125 ANSI CLASS 250

2 - 12 14 - 42 2 - 12 14 - 42

200 150 400 300

T

he unique seating design provides initial contact with the valve

disc and the Buna-N ring, providing a drop-tight seal. As the

pressure increases, the Buna-N ring is compressed slightly and

the disc makes contact with the metal portion of the valve seat, preventing

any further compression of the Buna-N ring. The Buna-N ring will continue

to provide the drop-tight seating during the higher pressure ranges without

damage from the increased pressure loading.

VACUUM BREAKER WITH AIR RELEASE VALVE

FOR WASTEWATER SERVICE

VALVE

SIZE

MODEL NUMBERA B

125 LB. CLASS (CWP)

3 1803VBS/48A 200 16 20 5/16

4 1804VBS/48A 200 17 3/8 21 5/16

5 1805VBS/48A 200 18 3/4 22 1/16

6 1806VBS/48A 200 20 22 9/16

8 1808VBS/48A 200 22 3/4 23 9/16

10 1810VBS/48A 200 25 5/8 25 1/16

12 1812VBS/48A 200 28 3/4 24 7/16

14 1814VBS/48A 150 30 7/8 25 3/16

16 1816VBS/48A 150 33 3/4 26 5/16

1803VB/38 - 1816VB/38Vacuum Breaker Valve

1803VBS/48A - 1816VBS/48A

Vacuum Breaker Valve

SEAT DETAIL

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VACUUM PRIMING VALVES

COMPONENT MATERIAL

Body and Cover Cast Iron ASTM A126, Class B

Trim Stainless Steel, Type 316

Exterior Coating Universal Alkyd Primer

Orifice Seal Buna-N

APPLICATION

Centrifugal pumps require that the pump housing and suction

piping be filled with water or "primed" before they can be started.

Vacuum priming systems are often used to draw air out of the

pump housing and suction piping to create a vacuum thereby

raising the water level until the pump is full of water or primed.

The purpose of the Val-Matic Vacuum Priming Valve is to

automatically allow air to be drawn out of the pumping system until

the pump fills with water. Then, when the water reaches the priming

valve, the float rises and closes the priming valve to prevent fluid

from flowing to the vacuum priming system. The priming valve will

then continue to release air while the pump is running.

DESIGN FEATURES

The Val-Matic Model 38P and 45P priming valves are designed specifically for priming service. The valve includes a long

body and skirted float to eliminate leakage caused by the high vacuum levels that occur at the valve outlet. All of the inter-

nal trim is Type 316 Stainless Steel for long life, even in aggressive water.

OPTIONS

An optional Water Level Control Switch (WLCS suffix) is sometimes used to signal when the water level has reached the pump

or provide a warning that the pump has lost its prime (wet well is empty or suction line is blocked.) The flow switch has SPDT

contacts rated 5A @ 125/250 VAC, 3A Inductive @ 30 VDC, UL and CSA Listed Explosion Proof.

VAL-MATIC VACUUM PRIMING VALVES

MODEL

NO.

INLET

SIZE

CWP,

PSI

ORIFICE

SIZEA B

38P 2 NPT 150 3/16 7 15 5/16

38P.2 2 NPT 75 5/16 7 15 5/16

45P 2 NPT 150 23/64 9 1/2 12 1/4

45P.3 2 NPT 75 1/2 9 1/2 12 1/4

RECOMMENDED PIPING

ARRANGEMENT


MODEL NUMBERS

38P - 45P.3

Vacuum Priming Valve

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VACUUM PRIMING VALVES

The table lists the capacities of the various valve orifices at a range of differential pressures from 0.5 in

mercury (.24 psi) to 29 inches mercury (14.2 psi). The required flow (SCFM) and the differentia

pressure (inches-mercury) can be used to select an orifice size. The flow can be estimated by

calculating the volume of the suction piping and pump housing and dividing by the desired initiapriming time (typically 30 minutes). The sizing differential pressure is typically 10 in-hg but is affected

by the required lift of the water. For multiple pump applications, a priming valve should be installed at

each pump.

FLOW CAPACITIES FOR VAL-MATIC PRIMING VALVES

PRESSURE

DIFFERENTIAL

ACROSS

ORIFICE

INCHES HG*

RATE OF FLOW IN SCFM

No. 38P PRIMING VALVE No. 45P PRIMING VALVE

ORIFICE 3/16 ORIFICE 5/16 ORIFICE 23/64 ORIFICE 1/2

C.W.P. 150 C.W.P. 75 C.W.P. 150 C.W.P. 75

.5 1.4 3.5 5.0 10.0

1 1.9 4.8 7.5 13.5

2 2.4 7.3 10.5 17.0

3 2.6 8.3 11.5 21.0

4 3.0 10.0 14.0 24.0

5 3.3 11.0 15.0 27.0

6 3.6 11.5 16.5 30.0

7 3.9 13.0 18.0 32.0

8 4.2 13.5 19.0 34.0

9 4.4 14.0 20.5 36.0

10 4.6 15.0 22.0 39.0

11 4.8 16.0 23.0 40.0

12 5.0 16.5 23.8 42.0

13 5.3 17.0 24.6 43.0

14 5.5 17.7 25.6 45.0

15 5.7 18.5 26.5 47.5

16 5.8 19.0 27.0 48.5

17 6.0 19.5 28.0 50.0

18 6.2 20.0 29.0 52.0

19 6.5 20.7 30.0 53.0

20 6.6 21.3 30.5 55.0

21 6.8 21.8 31.4 56.0

22 6.9 22.3 32.0 57.0

23 7.0 23.0 32.7 58.0

24 7.2 23.5 33.5 60.0

25 7.4 24.0 34.0 61.0

26 7.7 24.3 35.0 62.0

27 7.9 25.0 36.0 64.0

28 8.0 25.6 36.8 65.0

29 8.1 26.0 37.3 67.0

*Mercury

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