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101015-RMG-BD226 Product Handbook-JJ

ECC/226-TICM

Bryan Donkin RMG Gas Controls Limited

LOW GAS PRESSURE REGULATOR RMG-BD226 SERIES

Introduction

The RMG-BD226 series is a range of Low Pressure,

Direct-Acting, diaphragm operated, spring loaded

regulators.

Use with confidence on natural and manufactured

gases of non-aggressive nature, including Nitrogen,

Carbon Dioxide, Propane and Butane etc.

Application:

Designed primarily for control of fuel feeds to

industrial and commercial burners, heater units,

boilers and other items of equipment where an

accurate, safe and reliable controlled pressure is

required.

Features & Benefits

Quick response to rapid load changes

Installation at any angle

Wide operational pressure range

PRODUCT HANDBOOK

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INDEX

Page

1 Introduction

2 Index

3 Models

4 / 5 Spring Selection

6 Capacities

7 Dimensions & Weights

8 Spares Kit Selection

9 / 12 Health & Safety Guidance – Pressure Control Equipment

13 Pre-Commissioning Instructions

14 / 16 Installation & Commissioning Instructions

17 Fault Finding

18 / 19 Maintenance Instructions for 1/2”, 3/4” & 1” - RMG-BD226 series Mk.2 regulator

10 / 21 Maintenance Instructions for 1.1/4”, 1.1/2” & 2” - RMG-BD226 series Mk.3 regulator

22 /24 Maintenance Instructions for DN50 - RMG-BD226 series Mk.2 regulator

25 / 27 Maintenance Instructions for DN65 & DN80 - RMG-BD226 series Mk.2 regulator

28 / 30 Maintenance Instructions for DN100 & DN150 - RMG-BD226 series Mk.2 regulator

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Service Conditions

Size Connection Type Type OS NUMBER Outlet Pressure Range

1/2” Screwed 226 Mk2 RMG-BD226L1018 3.7 to 75 mbarg

3/4" Screwed 226 Mk2 RMG-BD226L1026 3.7 to 75 mbarg

1” Screwed 226 Mk2 RMG-BD226L1034 3.7 to 75 mbarg

1.1/4” Screwed 226 Mk3 RMG-BD226L1042 3.7 to 80 mbarg

1.1/2” Screwed 226 Mk3 RMG-BD226L1059 3.7 to 80 mbarg

2” Screwed 226 Mk3 RMG-BD226L1067 3.7 to 80 mbarg

DN 50 Flanged 226 Mk2 RMG-BD226L3005 3.7 to 80 mbarg



DN100 Flanged 226 Mk2 RMG-BD226L3039 7.5 to 150 mbarg

DN150 Flanged 226 Mk2 RMG-BD226L3047 12.5 to 150 mbarg

DN 50 Flanged 226H Mk2 RMG-BD226H3004 70 to 150 mbarg



Temperature Range: -20 to +60 Deg.C

Screwed Connections: ISO 7-1 Rp (other thread connections considered on request)

Flanged Connections: PN16: BS EN 1092-2: 1997

Designed to comply with the requirements of EN88, Class B, Group 2

Approval: Gas Appliance Directive (90/396/EEC)

Optional Extra‟s

Inlet Filter (screwed sizes = push-in type, Flanged sizes = joint type)

Safety Diaphragm (SD)

ECL – External Control Line (impulse)

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SPRING SELECTION OVERVIEW

Threaded models (aluminium body)

OS Number (size)

[226 Mk.2] Spring No. Colour

Outlet Pressure Range

in mBar

RMG-BD226L1018 (½”)

RMG-BD226L1026 (¾”)

RMG-BD226L1034 (1”)

50055830-397 Red 3.7 – 7.5

50055830-398 Blue 7.5 – 15

50055830-399 Self 12.5 – 25

50055831-045 Green 24 – 37

50055830-805 Yellow 35 - 75

OS Number (size)



in mBar

RMG-BD226L1042 (1¼”)

RMG-BD226L1059 (1½”)

50055831-153 White 3.7 – 10

50055831-067 Red 8– 14

50055831-068 Green 12 – 25

50055831-069 Blue 21– 35

50055831-070 Yellow 33- 55

50055831-071 Black 50 - 80

OS Number (size)

[226 Mk.3) Spring No. Colour


in mBar

RMG-BD226L1067 (2”)

50055831-154 White 3.7 – 10

50055831-072 Red 8– 14

50055831-073 Green 12 – 25

50055831-074 Blue 21– 35

50055831-075 Yellow 33- 55

50055831-076 Black 50 - 80

Flanged models (aluminium body)

OS Number (size)



in mBar

RMG-BD226L3005 (DN50)

50055830-292 Red 3.7 – 7.5

50055830-293 Blue 7.5 – 15

50055830-283 Self 12.5 – 25

50055830-284 Green 23 – 37

50055830-285 Yellow 35 - 80

OS Number (size)

226H – Mk.2 Spring No. Colour


in mBar

RMG-BD226H3004 (DN50)

50055830-772 Brown 70 – 112

50055830-773 Orange 100 - 150

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SPRING SELECTION OVERVIEW

OS Number (size)



in mBar

RMG-BD226L3013 (DN65)

RMG-BD226L3021 (DN80)

50055830-545 Red 3.7 – 7.5

50055830-547 Blue 7.5 – 15

50055830-548 Self 12.5 – 25

50055830-549 Green 23 – 37

50055830-550 Black 35 – 60

50055830-598 Grey 55 - 80

OS Number (size)

[226H – Mk.2] Spring No. Colour


in mBar

RMG-BD226H3012 (DN65)

RMG-BD226H3020 (DN80)

50055830-774 Brown 70 – 112

50055830-775 Orange 100 - 150

Flanged models (ductile iron body)

OS Number (size)



in mBar

RMG-BD226L3039 (DN100)

50055830-409 White/Gold 7.5 – 15

50055830-410 Black/Gold 12.5 – 25

50055830-412 Yellow/Gold 23 – 37

50055830-414 Brown/Gold 35 – 80

50055830-407 Grey/Maroon 70 - 150

OS Number (size)



in mBar

RMG-BD226L3047 (DN150)

50055830-419 Lt.Blue/Dk.Green 12.5 – 25

50055830-420 Yellow/Lt.Blue 23 – 37

50055830-430 Lt.Green/Brown 35 – 60

50055830-431 Lt.Green/Grey 55 – 112

50055830-617 Self 100 - 150

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Dimensions & Weights

SIZE Type A B C D E F Wt.

Kg‟s

1/2” SC 226 Mk2 103 35 90 108 80 140 0.68

3/4" SC 226 Mk2 103 35 90 108 80 140 0.66

1” SC 226 Mk2 103 35 90 108 80 140 0.60

1.1/4” SC 226 Mk3 163.5 55 137.5 170 80 210 1.58

1.1/2” SC 226 Mk3 163.5 55 137.5 170 80 210 1.58

2” SC 226 Mk3 210 61.5 172.5 230 90 270 3.17

DN50 FL 226 Mk2 210 58 261 213 110 420 5.0

DN65 FL 226 Mk2 318 102 384 381 240 600 16.4

DN80 FL 226 Mk2 318 102 384 381 240 600 16.4

DN100 FL 226 Mk2 369 134 620 451 310 970 63.5

DN150 FL 226 Mk2 473 194 830 559 435 1270 114.7

SC = Screwed, FL = Flanged connections) All Dimensions in mm

Minimum

Service

Space. „A‟ Screwed

‘A‟ Flanged

B

C

F

Minimum

Service

Space. D dia.

E

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STANDARD SPARES KIT SELECTION

Size Series Conn, OS NUMBER Spares Kit Ref

1/2" 226 Mk.2 SC RMG-BD226L1018 200/WS-001-2

3/4” 226 Mk.2 SC RMG-BD226L1026 200/WS-001-2

1” 226 Mk.2 SC RMG-BD226L1034 200/WS-001-2

1.1/4” 226 Mk3 SC RMG-BD226L1042 201/WS-001

1.1/2” 226 Mk3 SC RMG-BD226L1059 201/WS-001

2” 226 Mk3 SC RMG-BD226L1067 202/WS-001

DN50 226 Mk2 FL RMG-BD226L3005 200/WS-016

DN65 226 Mk2 FL RMG-BD226L3013 200/WS-005

DN80 226 Mk2 FL RMG-BD226L3021 200/WS-005

DN100 226 Mk2 FL RMG-BD226L3039 200/WS-008

DN150 226 Mk2 FL RMG-BD226L3047 200/WS-010

DN50 226H Mk.2 FL RMG-BD226H3004 200/WS-016



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HEALTH AND SAFETY GUIDANCE – PRESSURE CONTROL EQUIPMENT

GENERAL

Regulators and other pressurised components, which may contain toxic, flammable or otherwise hazardous

media, are potentially dangerous items of equipment if not operated and maintained in the correct manner.

It is imperative that all users of such equipment fully educate themselves as to the potential dangers and satisfy

themselves that those personnel responsible for installing, testing, commissioning, operating and maintaining the

plant are competent to do so.

The instructions provided in this document assume some basic level of competence by user staff.

If there are any doubts or ambiguities concerning correct procedures contact your local supplier who will be

pleased to advise or provide competent service or instructions.

It should be understood that anything which is stated in this document, does not revoke or override instructions

which are issued by any other competent or authorised body and reference should be made to all relevant Codes

of Practice.

The following comments, whilst not exhaustive, provide guidance as to possible sources of danger to health and

safety.

NOISE

Regulators, and other pressure reducing devices can generate high levels of noise which can be injurious to people

exposed to it for long periods of time. Various recommendations and codes of practice are in existence and users

must ensure that adequate precautions are taken to prevent a health hazard to employees or third parties in this

respect.

INSTALLATION

All pressure containing equipment is designed to withstand the mechanical loads, experienced in normal service

i.e. torque and bending moments in addition to internal pressure. However, care should be taken during

installation to ensure the equipment is not subjected to excessive loads, which would overstress the product and

may result in a serious failure when the product is commissioned.

Excessive stresses can be caused by unsupported lengths of pipe work, or misalignment, and therefore

installations should adequately supported and carefully aligned.

All regulators, slam shut valves, relief valves, etc., should be installed with the correct direction of flow.

Pressure sensing lines are important components of any control system and it is essential that they are installed

correctly in accordance with instructions. Failure to do so can result, especially in the case of slam shut valves, in

excessive pressurisation of the downstream system.

Pressure sensing lines must be adequately supported to eliminate vibration which can result in fatigue failure.

They should also be positioned to ensure they cannot be used as foot or hand holds. Pressure sensing lines

should be slightly inclined so that liquids and condensates drain into the main pipe.

Auxiliary systems should not be tampered with or modified without a full knowledge of the operating conditions

and permission from the relevant engineering authority.

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OPERATION

Depending on the mode of operation the internal valves of regulators may be in the open position. Therefore, when

commissioning a regulator, isolation valves should be opened slowly so that the regulator may assume a regulating

position. If the valves are opened rapidly the regulator may not respond sufficiently quickly to prevent over-

pressurisation of the downstream system.

All regulators, etc., should only be fitted with the control or pressure loading spring as specified by the manufacturer.

Fitting an incorrect spring, or operating a spring outside its specified range, could result in the spring becoming 'coil

bound'. This is especially important when operating relief valves or slam shut valves as incorrect springs may prevent

a relief valve from opening or a slam shut valve from closing.

Precautions should be taken to prevent ingress of water through vent and breather holes. Ice on top of a diaphragm

may dangerously effect the operation of a regulator, slam shut valve or other equipment.

MAINTENANCE

WARNING

Before undertaking any maintenance work the system should be isolated and vented down in accordance with

current SAFETY CODES AND HEALTH AND AT SAFETY AT WORKS REGULATIONS

It may be necessary to purge the installation with an inert gas, such as nitrogen.

Special precautions are necessary for gases such as oxygen or chlorine and the user must ensure that adequate

procedures are prepared and implemented.

After venting it is wise to assume that high-pressure gas may be present when removing covers and plugs.

MAINTENANCE

As previously stated Pressure Control Equipment contains gases at pressures, which are sometimes higher than

atmospheric pressure. Before attempting to investigate problems to service or maintain equipment it must be safely

depressurised or pressurised to atmospheric conditions. As the gaseous medium may be flammable, toxic, corrosive

or otherwise hazardous, it may be necessary to purge the installation with an inert gas, such as nitrogen. Special

precautions are necessary for gases such as oxygen or chlorine and the user must ensure that adequate procedures

are prepared and implemented.

It is not sufficient to isolate the equipment as high pressures may be trapped between the isolating valves. Do not

attempt to remove covers, casing, plugs, etc., before the device has been correctly vented. Even then it is wise

to assume that high pressure gas may be present when removing covers and plugs.

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Most pressure control equipment use coil springs as a loading device. It is important to reduce the load on these

springs by winding back the spring adjuster as far as possible. In certain cases residual load will still be present which

may cause the spring housing to jump up when its fasteners are removed.

In some cases heavy residual spring loads are present even when the spring is relaxed to its maximum within the

confines of the spring housing. In such a case special dismantling screws are provided and it is imperative they be

gradually and evenly slackened in turn to allow the spring to fully extend to its free length. Failure to use these

dismantling screws may result in damage or personal injury.

On slam shut valves in general the door may be in the open position and before any maintenance work is carried out

the door should be tripped to its closed position. However on cartridge type slam shut valves it should be noted the unit

is removed from the body with the door in a latched open position and before any maintenance work is carried out the

door should be tripped to its closed position.

Note the coil spring attached to the door is a loading device and care should be taken when tripping unit.

The area around regulators, relief valves, slam shut valves, etc., may require to be subject to monitoring in order to

detect gas leaks, etc., and due consideration must be given to the installation of gas detecting equipment. The use of

naked flames and non-certified electrical or potential spark generating equipment in such environments is

strictly forbidden.

All gas venting points must be piped to a safe location and fitted with an approved flame trap, as must drain lines which

may allow the escape of gas.

Consideration should be given to reduce the possibility of static electricity being produced in clothing, to avoid a source

of ignition.

WARNING

Maximum rated working pressures and temperatures must not be exceeded.

WE REPEAT - IF IN DOUBT ASK - DO NOT TAKE RISKS

Pressurised components, which may contain hazardous media, are potentially dangerous items of equipment if not

operated and maintained in the correct manner.

All users of such equipment must be trained and competent to carry out their work. Instructions assume a level of

competence by user staff.

Attention must be paid to relevant regulatory requirements and Codes of Practice. All necessary notifications should be

made and measures taken for the protection of personnel.

If there are any doubts or ambiguities concerning correct procedures contact your local supplier who will be pleased to

advise or provide competent service or instructions. DO NOT TAKE RISKS

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INSTALLATION

Care should be taken during installation to ensure the equipment is not subjected to excessive loads, which would

over stress the product and may result in a failure when the product is commissioned. To avoid excessive

stresses pipe work should be adequately supported and carefully aligned. Additional equipment must not be

bolted on to the regulator without due attention to the effect of the extra weight on flanges and other loadings.

Check the equipment is suitable for system pressures, it is installed with the correct direction of flow and that gas

velocity limits in the pipe work will not be exceeded.

Use new fasteners, gaskets or other sealing materials.

Check that adequate space is provided for maintenance and removal / replacement of elements.

For best performance install with the diaphragm casing horizontal with the spring housing vertically upwards,

inverted installation will reduce the outlet pressure range, spring horizontal installations are not recommended.

External control line (ECL) type regulators, the impulse connections should be made from 12 mm stainless steel

pipe connected either on the top or side of the outlet pipe (never on the underside). To assist with

commissioning/maintenance impulse connections should be fitted with ancillary isolation valve(s).

To function, the regulator has to ‘breathe’ to atmosphere. Refer to codes of practice for the need to pipe the

breather to a ‘safe’ area, this breather will pass gas if the diaphragm is ruptured, or, in the case of integral relief

functions, when the relief set pressure is exceeded.

Regulators may pass a very small amount of gas when closed therefore to avoid overpressure occurring a

relief valve must be fitted in the downstream pipe upstream of any isolating valve.

All relief valve outlets (gas discharge to atmosphere) must be piped away to a safe area.

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PRE-COMMISSIONING INSTRUCTIONS

GENERAL

The information contained in the following installation and commissioning instructions is intended to provide

guidance additional to any mandatory, International, National, Company or Site Standards, or Codes of Practice or

Operating Procedures, which apply to the item of equipment or installation.

The personnel undertaking the installation and commissioning should be familiar with the applicable Standards and Regulations and have the necessary knowledge to carry out the recommended procedures.

INSTALLATION

Equipment should be installed without distortion of the adjacent pipe work.

Pipe line stresses must not be transmitted to the equipment.

The flow arrow on the body indicates direction of media flow through the equipment.

Measuring and Impulse lines - transmit pressure from the sense point to the diaphragm chamber.

Vent lines - connect the reference side of the diaphragm to atmosphere and will vent the media to atmosphere in the event of a diaphragm failure.

Loading and Unloading lines - transmit pressure from a pilot or similar device to the active side of the regulator diaphragm.

COMMISSIONING

Before commencement of commissioning the appropriate „Purging Procedures‟ and any standing instructions on „Pressurising‟ together with „Health and Safety at Works Act‟ requirements must be adhered to.

The application of pressure together with the opening and closing of valves is an important and integral

part of the commissioning procedure and must be carried out with due care, instructions to “open slowly”

or “open very slowly”, where applied, should be strictly observed.

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INSTALLATION & COMMISSIONING INSTRUCTIONS

SAFETY RECOMMENDATIONS

It is recommended before undertaking any installation or commissioning all operatives are fully conversant with the

Health & Safety and Pre-Commissioning guidance information contained in pages 9 to 13.

Ensure all applicable standards, codes, government regulations are observed and recommendations and

requirements are satisfied.

TYPICAL INSTALLATION

REGULATOR INSTALLATION

1. Clean inlet piping to remove any dirt and debris that could damage the regulator or impair its operation.

During operation, if debris is likely to be present in the system, a filter should be fitted upstream of

regulator.

2. Check the required duty is within the regulator badged operational band.

3. Ensure all packing including thread protectors or/and flange covers are removed. Check for internal or

external damage. Clean out regulator body if necessary.

4. Position regulator so it is accessible for adjustment, ensure adequate space is available on the top and

below for maintenance purposes.

5. Install regulator in a horizontal pipe with spring case uppermost and allow for at least 5 pipe diameters (of

expanded size if applicable) of straight outlet for optimum performance.

6. Check regulator flow arrow is in the correct direction. Use pipe sealant on male threads only. On flanged

installations use gaskets. Tighten flange bolts equally and diametrically opposite until all firmly secured.

7. On all well ventilated outdoor installations make sure the vent valve is fitted to prevent water, insects and

debris entering the diaphragm case, as this will interfere with the correct operation of the regulator.

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8. On indoor inadequately ventilated installations fit a remote vent line, which should be as short as possible

with a minimum use of bends and terminate to a safe area. Protect terminal point against entry of water

inspects and debris, but do not impair operation.

9. If the regulator has a connection for an External Control Line (ECL), use 1\2” or 12mm OD Stainless

Steel tubing and valve of the same bore for the line. Site with adequate protection against breakage,

regulator goes wide open if line is broken and align to drain away from regulator and without ‘U’ bends to

avoid moisture pockets. Run the line for a minimum of 5 pipe diameters (of expanded size if applicable)

downstream from the regulator to a straight run of pipe where turbulence is at a minimum. Keep clear of

elbows, valves and other causes of flow disturbance. When making the control connection ensure inside

the pipe is smooth and clean, remove any rough edges, weld build up etc. and locate on the centre line or

above (not the bottom).

10. Purge the installation in accordance with mandatory local regulations. Make sure there are no leaks and

all connections are firm and tight.

TO COMMISSION REGULATOR INITIALLY

11. Remove regulator top cap. Rotate spring adjuster anti clockwise to approximate minimum position.

12. Slowly open external control line valve C (ECL regulators only).

13. Slowly open downstream valve B.

14. Very slowly open upstream Valve A.

REGULATOR ADJUSTMENT

15. As the gas flows through the regulator. Turn spring adjuster clockwise to increase the outlet pressure, to

the required level.

16. Replace top cap and screw well down to prevent debris entering. The absence of top cap may also cause

unstable operation as the diaphragm, thus valve can move too quickly.

To check lock up, close down the demand, ensure the regulator locks up adequately at zero flow, expect no more

than 5 to 15mbar above setting, depending on size.

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TO SHUT DOWN REGULATOR FOR MAINTENANCE

17. Carefully close Valve A, allow inlet pressure to dissipate into outlet and then Valves B and C (ECL

regulators only).

18. Vent installation in a safe manner in accordance with local mandatory regulations and standards.

Proceed in accordance with relevant maintenance instructions

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OPERATION - Fault Finding – Direct Control Regulators

Fault Location Possible Cause Remarks

No outlet Pressure

Control Regulator

Check type of regulator:

ICL – Internal Control Line

ECL – External Control Line

If ECL type, connect Impulse Line

downstream

Installed in pipeline with body arrow

pointing in wrong direction

Install regulator with body arrow

pointing in direction of flow

Regulator internals damaged. Check and replace regulator

internals – if necessary

Closing Pressure is

too high

Valve does not close

Regulator main valve

or middle sealing

diaphragm

Defective diaphragm Fit new Diaphragm - consider

Spares Kit

Valve seat damaged or worn Check Valve/Orifice and Valve Seat

– replace where necessary

Worn or damaged seal(s) Fit new seals

Pulsating/Oscillating

Outlet Pressure

Regulator main valve Regulator Valve operating near

closed position e.g. chattering

Check for correct sizing of

Regulator

Diaphragm assembly Diaphragm acting too fast against

outlet pressure fluctuations

Consider fitting a restrictor/jet in the

atmospheric vent or External

Control Line – to dampen down

Excessive Control

Deviations Pressure sensing point

Incorrect Impulse location in outlet

pipe work

Check for correct positioning of

ECL

If the pipe is expanded ECL must

be fitted into the larger sized pipe.

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MAINTENANCE INSTRUCTIONS FOR:

3\4” and 1” SCREWED – RMG-BD226 SERIES (MK.2) REGULATORS

BEFORE SERVICING REGULATOR

Before undertaking any maintenance, ensure you are fully conversant with the Health & Safety information given in

pages 9 to 12. – IF IN DOUBT ASK

TO PREPARE REGULATOR FOR SERVICING

1. Remove cap (1) and gasket or ‘O’ ring (2).

Rotate spring adjuster (3) anti-clockwise until

free

Lift out spring (4) from spring case (5).

2. Loosen setscrews (7) and remove. Lift away

upper diaphragm\spring case (5).

3. Unscrew bottom plug (22). Remove from

regulator body.

4. Ease away main diaphragm 9 from the lower

diaphragm case\body (21).

5. Insert box spanner through bottom opening

and hold on nut (20) whilst releasing nut (6).

Remove upper diaphragm plate (8), main

diaphragm (9), lower diaphragm plate (10)

and distance piece (11).

6. Remove spindle\valve assembly and washer (15) via the bottom opening.

7. Release setscrews (12). Remove retaining plate (13) and balancing diaphragm (14) from regulator body.

TO SERVICE REGULATOR

8. Thoroughly clean regulator body, casings, covers, etc., free from rust, scale, etc.

9. Look into the regulator body and inspect the valve orifice, especially the radiused seating area, this must be

smooth and dirt free. Clean if necessary by lightly rubbing surface with fine emery cloth (well used O grade

– 220 grit is suitable). On no account bring pressure to bear. Clean well down afterwards.

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10. Inspect all other machined parts of regulator body, casings, covers, etc. Ensure they are clean and free

from rough edges which would prevent proper sealing of gaskets, diaphragms and ‘O’ rings.

11. Check that the small vent orifice in upper diaphragm\spring case (5) is open and clear.

12. Carefully stretch both diaphragms where they flex on plates (8), (10) & (13) washer, distance piece (11) &

(12) and also on the casings (5) & (21). No hairline cracks are permissible, neither are surface blisters or

crushing at the rim - all warrant diaphragm replacement, remember diaphragm failure means regulator

goes out of control.

On no account apply grease onto any part of the diaphragms.

13. Apply a very small amount of grease (Centaurus No. 3 or equal) on setscrews (12) and bottom plug (22)

also on threads of spindle (11) to help sealing.

14. Examine carefully the valve cover (17). Its surface must be smooth, free from any cutting or abrasion

marks. It should not be twisted and lie firmly on valve washer (18). Replace as routine measure. Firmly

tighten down nut (20).

15. Ensure impulse tube (19) is clear of any obstruction. Check by blowing down body port.

TO RE-ASSEMBLE REGULATOR

16. Replace balancing diaphragm (14) (convolution uppermost), retaining plate (13) (rim cut out to match one

in diaphragm (14). Tighten setscrews (12) evenly and firmly down.

17. Insert valve and spindle (16) assembly with washer (15) in place through the bottom opening into sealing

diaphragm (14).

18. Use box spanner to hold valve and spindle assembly vertically and centrally up into body orifice. Refit

distance piece (11). Lower diaphragm plate (10), main diaphragm (9)-convolution uppermost and upper

diaphragm plate (8).

19. Hold tight on nut (20) and upper diaphragm plate\main diaphragm (8) & (9) Tighten nut (6) firmly down.

20. Refit upper diaphragm\spring case (5). Evenly tighten setscrews (7) to ensure gas-tight diaphragm seal.

21. Check valve, spindle and diaphragm assembly moves freely. Replace bottom plus (22).

22. Replace spring (4) making sure it rests correctly over nut (6), spring adjuster (3), top cap with gasket or ‘O’

ring (1) & (2)

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1.¼”, 1.½” & 2” SCREWED – RMG-BD226 SERIES (MK.3) REGULATORS




1. TO PREPARE REGULATOR FOR SERVICING

1.1 Remove cap (9) and ‘O’ ring

(8). Rotate spring adjuster

(11) anti-clockwise until free.

Press cap (11) and turn anti-

clockwise to remove. Lift out

spring (5) from spring

housing (2).

1.2 Loosen screws (42) and

remove. Lift away spring

housing (2) taking care not

to damage safety diaphragm

(36), if fitted.

1.3 Lift out safety diaphragm

assembly (if fitted).

1.4 Remove bottom plug (23)

and ‘O’ ring (22) from

regulator body.

1.5 Easy away main diaphragm

(3) from regulator body.

1.6 Insert Allen Key through

bottom opening and fit into

recess on valve back (21).

Unscrew bolt (7) and remove

together with washer (6).

1.7 Remove main diaphragm plate (4), main diaphragm (3)and distance piece (16) from above and remove

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valve back (21), valve seat (20) and valve plug (18) through bottom opening.

1.8 Remove screws (24) and middle diaphragm (17) from regulator body.

2. TO SERVICE REGULATOR

2.1 Thoroughly clean regulator body, casings, covers, etc., free from rust, dirt, scale, etc.

2.2 Look into regulator body and inspect valve orifice, especially the valve seating area. This must be

smooth and free from dirt and any other deposits. Clean if necessary by lightly rubbing the surface with

fine emery cloth (well used O grade – 220 grit is suitable). On no account bring pressure to bear.

Clean well down afterwards.

2.3 Inspect all other parts of regulator body, casings, covers, etc. Ensure that they are free from rough

edges which would prevent correct sealing of diaphragm ‘O’ rings, etc.

2.4 Remove vent plug (14) and check that the breather passage is free from accumulations of paint and

dirt, etc.

2.5 Ensure impulse tube (19) is clear of any obstruction. Check by blowing down body port.

3. TO REASSEMBLE REGULATOR

The regulator is reassembled in reverse order of that detailed in Section 1 above. However, special care should

be taken of the following points.

3.1 Replace ‘O’ rings (8) and (22) with new items.

3.2 Replace safety diaphragm assembly (if fitted), middle diaphragm, main diaphragm and valve seat.

3.3 When refitting middle diaphragm (17) ensure that slot on outer edge is fitted over peg on body.

3.4 Tighten bolt (7) to a maximum torque of 6Nm.

3.5 When fitting the top casing ensure:

(a) The middle diaphragm is not twisted.

(b) The main diaphragm is not twisted and the sealing bead is fitted in the groove in the body.

(c) The safety diaphragm is not twisted and the sealing bead is fitted in the groove on the top casing.


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DN50 FLANGED – RMG-BD226 SERIES (MK.2) REGULATOR





1. Remove cap (31) and gasket or ‘O’

ring (32); rotate spring adjuster (33)

anticlockwise until free; lift out thrust

washers (34) and spring from spring

case (35).

2. Loosen setscrews (20) and remove;

lift away upper diaphragm/spring

case (35).

3. Unscrew bottom plug (25); remove

from regulator body.

4. Ease away main diaphragm (12) from

the lower diaphragm case/body.

5. Insert box spanner through bottom

opening and hold tight on nut (9)

whilst releasing the other nut (9)

(screwed onto the spring retainer).

Remove spring retainer (10), main

diaphragm (12), distance piece (38),

(flanged models only), travel stop (13).

6. Remove spindle and valve assembly

via the bottom opening.

7. Release setscrews (21); remove

washer (22) – [if fitted], balancing

diaphragm (14) from regulator body.


*Note: The Diagram illustrates our DN50 Series 226 HP Regulator

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ECC/226-TICM


8. Thoroughly clean regulator body, casings, covers, etc., free from rust, scale etc.

9. Look into the regulator body and inspect the valve orifice, especially the radiused seating area this must

be smooth and dirt free. Clean if necessary by lightly rubbing surface with fine emery cloth (well used ‘O’

grade – 220 grit is suitable). On no account bring pressure to bear; clean well down afterwards.



11. Check vent plug (7); see that breather passage is clear of paint and dirt accumulations; also check that

the small vent orifice in upper diaphragm/spring case (35) is open and clear.

12. Apply a very small amount of grease (Centaurus No. 3 or equal) on setscrews (21) and bottom plug (25)

to help sealing.

13. Make sure the guide pin (fitted only on flanged regulators with 0.5 bar inlet pressure rating) can move

freely inside nut (9).

14. Carefully stretch both diaphragms where they flex on their integral plates and also on the casings, no

hairline cracks are permissible, neither are surface blisters or crushing at the rim; all warrant diaphragm

replacement – remember diaphragm failure means regulator goes out of control.

When renewing balancing diaphragm (14) apply a smear of grease (Centaurus No. 3 or equal) just

around the impulse hole and within the sealing bead to help tightness.

On no account apply compound onto diaphragm rims.

15. Examine carefully the valve cover (16), its surface must be smooth, free from any cutting or abrasion

marks; it should not be twisted and lie firmly on valve washer (17); replace as routine measure; firmly

tighten down nut (9).

16, Ensure impulse tube (24) is clear of any obstruction, check by blowing down body port (RMG-BD226

series-ECL regulators, excepted, impulse pipe replaced by plug).

TO ASSEMBLE REGULATOR

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ECC/226-TICM


17. Replace balancing diaphragm (14) [convolution uppermost]; washer (22) [if fitted], or nearest setscrew to

impulse tube (24); tighten setscrews (21) firmly down.

18. Insert valve and spindle (15) assembly through the bottom opening into sealing diaphragm (14).

19. Use box spanner to hold valve and spindle assembly vertically and centrally up into body orifice.; refit

travel stop (13), distance piece (38), (flanged models only) main diaphragm (12) (convolution uppermost)

and spring retainer (10).

20. Hold tight on nut 9 and main diaphragm (12). Tighten nut (9) firmly down.

21. Refit upper diaphragm/spring case (35), evenly tighten setscrews (20) to ensure gas tight diaphragm seal.

22. Replace bottom plug (25); check valve, spindle and diaphragm assembly moves freely on the guide pin (if

fitted).

23. Replace the spring, making sure it rests correctly over spring retainer (10), thrust washers (34), spring

adjuster (33), top cap with gasket or ‘O’ ring (31) and (32).


DN65 and DN80 FLANGED – RMG-BD226 SERIES (MK.2) REGULATOR

25


ECC/226-TICM






1. Disconnect the remote vent

line/back loading line/external

control line (if fitted).

2. Remove cap (20) and gasket or ‘O’

ring (22); rotate spring adjuster (23)

anticlockwise until free; lift out thrust

washers (15) and spring (14) from

spring case (25).

3. Loosen setscrews (4) and remove;

lift away spring case (25) and

gasket (12) - if fitted.

4. Mark the position of bottom cover

(1) relative to valve body (40) and

then hold firmly whilst releasing nuts

(46). Gently lower cover and gasket

(2) from regulator body (40).

5. Remove setscrews (10), gently pull

away upper diaphragm case (28).

Ease away main diaphragm (29)

from lower diaphragm case (30).


opening and hold tight on guide

bush (38) whilst releasing nut (13).

Remove spring retainer (26), upper

main diaphragm plate (11), main

diaphragm (29), lower main

diaphragm plate (31), distance

piece (9) and upper sealing


7. Remove spindle and valve assembly with lower sealing diaphragm plate (5) and washer (37) via the

bottom opening.

26


ECC/226-TICM


8. Release nuts (46), remove lower diaphragm case (30), sealing diaphragm (6) and gasket (2) from

regulator body.



10. Look into the regulator body and inspect the valve orifice, especially the tapered seating area. This must

be smooth and dirt free. Clean if necessary by lightly rubbing surface with fine emery cloth (well used ‘O’

grade – 220 grit is suitable). On no account bring pressure to bear. Clean well down afterwards.



12. Check vent valve (if fitted). Make sure internal valve plates lay firmly and closely together on the valve

seat. If vent plug fitted, see that breather passage is clear of paint and dirt accumulations.

13. Renew all gaskets. Rub well into both surfaces a very small amount of grease (Centaurus No. 3 or

equal) to help sealing. Also, lightly grease the rim of lower diaphragm case (30) to ensure tightness.

Also renew gasket or ‘O’ ring (22) with a ‘O’ ring in a dry and grease free condition.

14. Make sure guide pin (42) (fitted only on regulators with 0.5 bar inlet pressure rating) can move freely

inside guide bush (42) and that the pin retaining nut is tightened firmly down.

15. Carefully stretch both diaphragms where they flex on the diaphragm plates (11), (31), (33), (5) and

casings (28), (30) and body (40). No hairline cracks are permissible, neither are surface blisters or

crushing at the rim, all warrant diaphragm replacement. Remember diaphragm failure means regulator

goes out of control.

When renewing diaphragms apply a sealing compound (Pasticol X106 or equal) on both sides around the

central hole, say for 1”\25mm dia. On the sealing and 2”\50mm dia on the main diaphragm. Also apply

compound on the diaphragm plates and spring retainer.

On no account apply compound onto diaphragm rims.

16. Examine carefully the valve assembly ‘O’ ring (34), its surface must be smooth, free from any cutting or

abrasion marks. It should not be twisted and lie firmly between valve wing (35) and valve back (36).

Renew in a perfectly dry and grease free condition as a routine measure. Lightly grease (silicone type)

new ‘O’ ring (43) before fitting to help sealing. Firmly tighten down guide bush (38).

17. Ensure impulse tube (55) is clear of any obstruction, check by blowing down body port (RMG-BD226

series-ECL regulators, excepted, impulse pipe replaced by plug).

27


ECC/226-TICM


18. Check that the small pressure orifice is open and clear. Replace the sealing screw and firmly tighten

down.

19. Check that the remote vent line\back loading line\external control line (if fitted) are secure, clear and free

from dirt and paint accumulations.


20. Replace gasket (2) sealing diaphragm (6) (dish towards regulator body) and lower diaphragm case (30).

Tighten nuts (46) firmly down.

21. Insert valve and spindle (8) assembly with washer (37) and lower diaphragm plate (5) in place through

bottom opening into sealing diaphragm (6).


upper diaphragm plate (33), distance piece (9), lower main diaphragm plate (31), main diaphragm (29)

[dish towards regulator body], upper main diaphragm plate (11), spring retainer (26) and nut (13) [leave

loose].

23. Adjust the height of the valve and spindle assembly sufficiently to allow main diaphragm rim to lie flat on

the lower diaphragm casing (30). Turn main diaphragm to match holes in rim with holes in casing.

24. Hold tight on guide bush (38) and main diaphragm (29). Tighten nut (13) firmly down.

25. Refit upper diaphragm case (28), evenly tighten setscrews (10) to ensure gas tight diaphragm seal.

26. Replace gasket (2), bottom cover (1) – [in marked position, tighten nuts (46) firmly down].

27. Lift the diaphragm\valve\spindle assembly to the closed position. Let go and watch movement, this must

be smooth and even to the fully open position (on guide pin (42) - if fitted).

28. Refit gasket (12) - if fitted, spring case (25), setscrews (4), spring (14), making sure it rests correctly over

spring retainer (26), thrust washers (15), spring adjuster (23), top cap with ‘O’ ring (20) and (22).

29. Reconnect the remote vent line\back loading line\external control line (if fitted).

MAINTENANCE INSTRUCTIONS FOR: DN100 and DN150 FLANGED – RMG-BD226 SERIES (MK.2) REGULATOR

28


ECC/226-TICM






1. Remove cap (23), reduce compression of

spring (27) to a minimum by rotating

adjusting spindle (2) anti-clockwise.

2. Hold spring housing (21) firmly down

whilst removing nuts (30). Allow spring

housing to slowly rise [under the action

of spring (2)] away from the upper

diaphragm case (32). Remove the

spring housing and spring at the same

time (if regulator installed with minimum

service space specified) and gasket (31).

3. Hold bottom cover (46) firmly whilst

releasing nuts (30). Gently lower cover

and gasket (8) from regulator body (55).

4. Loosen bolts and nuts (30) & (37) and

remove. Gently lift away upper

diaphragm case, ease away main

diaphragm (36) from lower diaphragm

case (38).


opening and hold tight on guide bush

(1)whilst releasing nut (17). Remove

spring retainer (16), upper main

diaphragm plate (34), main diaphragm

(36) lower main diaphragm plate (35)

support bracket (if fitted), distance piece (39) and upper sealing


6. Remove spindle and valve assembly with lower sealing diaphragm plate (7) and washer (6) [DN100/4”

regulators only] via the bottom opening.

29


ECC/226-TICM


7. Release nuts (30). Remove lower diaphragm case (38), sealing diaphragm (10) and gasket (8) from

regulator body.



9. Look into the regulator body and inspect the valve orifice, especially the tapered seating area, this must

be smooth and dirt free. Clean if necessary by lightly rubbing surface with fine emery cloth (well used

‘O’ grade – 220 grit is suitable). On no account bring pressure to bear. Clean well down afterwards.

10. Inspect all other machined parts of regulator body, casings, covers, etc. Ensure they are clean and

free from rough edges which would prevent proper sealing of gaskets, diaphragms and ‘O’ rings.

11. Check vent valve and make sure internal valve plates lie firmly and closely together on valve seat. If

vent plug fitted, see that breather passage is clear of paint and dirt accumulation.

12. Renew all gaskets. Rub well into both surfaces a very small amount of grease (Centaurus No. 3 or

equal) to help sealing.

13. Make sure guide pin (47) can move freely inside guide bush (1). Check that the guide pin retaining nut

on the underside of bottom cover (46) is firmly tightened down (latest DN100/4” regulators only).

14. Carefully stretch both diaphragms where they flex on diaphragm plates (34), (35), (9), & (7), casings

(32), (38) and body (55). No hairline cracks are permissible, neither all surface blisters nor crushing at

the rim. All warrant diaphragm replacement, remember diaphragm failure means regulator goes out of

control.

When renewing diaphragms, apply a sealing compound (Plasticol X106 or equal) on both sides around

the central hole, say for 1”\25mm dia on the sealing diaphragm and say for 2”\50mm dia on the main

diaphragm. Also apply compound on the diaphragm plates and spring retainer for a gas tight seal. On

no account apply compound or grease on the diaphragm rims or diaphragm case rims; these must be

left perfectly dry.

15. Examine carefully the valve assembly ‘O’ ring (4), its surface must be smooth, free from any cutting or

abrasion marks. It should not be twisted and lie firmly between the valve plug or valve wing (DN100/4”

regulators manufactured prior to January 1984 only) and the valve back (3). Renew in a perfectly dry

and grease free condition as a routine measure.

Lightly grease (silicone type) new stem ‘O’ ring (2) before fitting to help sealing. Make certain washer

above is in place (DN100/4” regulators only). Firmly tighten down guide bush (1).

16. Ensure impulse tube (50) is clear of any obstruction. Check by blowing down the body port.

30


ECC/226-TICM


17. Renew ‘O’ ring (25) on adjusting spindle (20) by first releasing spring clip (24) and withdrawing the

spindle from inside of the spring case. Lightly coat the ‘O’ ring with a silicone type grease, before

replacing, to help sealing and free movement of the spindle.


18. Replace gasket (8), sealing diaphragm (10) (dish towards regulator body) lower diaphragm case (38),

tighten nuts (30) firmly down.

19. Insert valve and spindle (18) assembly with washer (6) [DN100/4” regulators only) and lower sealing

diaphragm plate (7) in place, through bottom opening into sealing diaphragm (10).


upper sealing diaphragm plate (9), distance piece (39), support bracket (if fitted), lower main diaphragm

plate (35), main diaphragm (36) (dish towards regulator body), upper main diaphragm plate (34), spring

retainer (16) and nut (17) (leave loose).

21. Lower valve and spindle assembly sufficiently to allow main diaphragm rim to lie flat on the lower

diaphragm casing (38). Turn main diaphragm to match holes in rim with holes in casing.

22. Hold tight on the guide bush (1) and main diaphragm (36). Tighten nut (17) firmly down.

23. Carefully fit upper diaphragm case (32). Evenly tighten nut and bolts (30), (37) to ensure gas tight

diaphragm seal.

24. Replace gasket (8), bottom cover (46) and nuts (30).

25. Lift the diaphragm\valve\spindle assembly to the closed position. Let go and watch the movement, this

must be smooth and even to the fully open position on guide pin (47).

26. Replace gasket (31), make certain spring adjuster (26) is in the top position. Insert spring (27) inside

the spring case and lift the two together back on the upper diaphragm case (if regulator installed with

minimum service space specified) making sure the spring rests correctly over spring retainer (16).

27. Push the spring case down and tighten nuts (30) firmly down, replace cap (23).

31


ECC/226-TICM


low gas pressure regulator - 燃烧器 燃烧器配件 ... · pdf filelow gas pressure...

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low gas pressure regulator - 燃烧器燃烧器配件 ... · pdf filelow gas pressure...