how to choose the right valve for pump control

HOW TO SELECT THE RIGHT VALVEFOR PUMP CONTROL

Brian GongolDJ Gongol & Associates, Inc.

July 18, 2014

Heartland Ops ConferenceKearney, Nebraska

Dangerous things to do

Get between Donald Trump and a camera

Follow too closely on the Interstate

Butt dial

Try to classify valves comprehensively

Lots of ways to try

Slide Rotary Globe Swing Sphere Diaphragm Sleeve Vertical-lift

Operator/actuation Seating Action Direction of flow Degree of rotation Allowable leakage Number of ports

But let's try a different way

Slide Rotary Globe Swing Sphere Diaphragm Sleeve Vertical-lift

Operator/actuation Seating Action Direction of flow Degree of rotation Allowable leakage Number of ports

Primarily: Purpose

What are we trying to make happen?

Protection

Management

Energy control

Secondarily: Means

How are we going about doing it?

Stopping flow

Throttling flow

1: Protecting by stopping (prior to pump)

1

Foot valve

Usually attached to a screen

Silent check valve

Suction-side check valve

1: Protecting by stopping (prior to pump)

High risk of clogging Introduces friction losses NPSH considerations (raises TDSL) Net energy impact: Priming protection vs. friction losses

2: Protecting by stopping (after pump)

2

Three basic types of post-pump check valve

Swing check

Lift check

Ball check

Lever-and-weight check

Cushioned check

Tilting-disc check

2: Protecting by stopping (after pump)

What's holding it closed? Weight of the ball, spring strength, disc weight

External controls or moving parts? Internal surface flow obstruction Adjustability Seating tightness

3: Protecting by stopping and throttling

3

Electric check

Throttling check

Tilting-disc check with buffers

3: Protecting by stopping and throttling

Controlling or dampening pump startup Controlling or dampening pump shutdown Immediacy of closure on power loss

4: Managing by stopping

4

Gate valves

Gate valves

Gate valves Knife-gate valves Resilient-wedge gate valves Double-disc gate valves

Water-control gates

Water-control gates

Slide gates Weir gates Sluice gates

5: Managing by stopping and throttling

5

Ball

Plug

Butterfly

Rotary pump control

Pinch

Cone

5: Managing by stopping and throttling

Solids passage Tightness of seal Seating type Coefficient of friction (Cv) versus clear opening Ease of seal/seat replacement

6: Energy control to protect (air)

6

Air-release (high-volume)

Vacuum-break

Air/vacuum

Air-release (low-volume)

Combination

6: Energy control to protect (air)

Potential for air accumulation Head to overcome on startup Weight of water column if held by vacuum Sidewall thickness of pipe Age of pipe

7: Energy control to protect (flow)

7

Surge-relief

Surge-anticipator

7: Energy control to protect (flow)

Abruptness of startup Abruptness of shutdown Momentum of water column Tendency to vaporize Pipe friction and tendency to dissipate

8: Energy control to manage

8

Pressure-reducing

Pressure-sustaining

Flow-control

Emergency cut-in

Altitude

9: Highly specialized

9

9: Highly specialized

Needle Solenoid Pilot

10: Backflow prevention

10

To recap

Protection by stopping

Protection by throttling

Protection by energy control

Management by energy control

Management by throttling

Management by stopping

Questions?

Thank you for coming! Brian Gongol DJ Gongol & Associates 515-223-4144 info@djgongol.com

References

Most valve images are courtesy of GA Industries All other images are original work by and copyright reserved

to Brian Gongol