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IOM-BQ

2

a.   Recommended installation is with the spring cham ber 

directed upwards.

b.  No corrosive 

fl

 uid should be utilized for spring cham-

 ber loading.

c.   System operation should ensure that loading pres-

 sure (P

LOAD

) not exceed inlet pressure (P

1

); in ter nal 

diaphragm damage may occur if this op er a tion al 
mode occurs.

11.     Regulators are not to be direct buried underground.

12.     For insulated piping systems, recommendation is to not 

insulate regulator.

13.    Spring Chamber Vent Tap - Option -25: Pipe spring 

chamber vent opening to remote location. Orient so as 
not to take on rainwater.

10a.  Basic Regulator - (Refer to Figure 1): Regulator may 

be rotated around the pipe axis 360°. Recommended 
positions are with the spring chamber vertical upwards, 
or horizontal. Orient such that the spring chamber vent 
hole does not collect rainwater or debris.

10b.   Cryogenic Regulator - Option -5 or -36 (Figure 2):

a.   Recommended installation is with spring cham ber 

hang ing directly below the body in a ver ti cal down-
 wards orientation. Allow water to drain; i.e. melting 
frost, rain water.

b.  Recommend inert purge gas to spring cham 

ber 

through vent hole and out drain hole.

10c.   Differential Regulator - Option -1+6 (Refer  to Figure 3).

7.  Slowly open the outlet (downstream) block valve ob-

 serv ing the inlet (upstream) pressure gauge. De ter mine 
if the regulator is 

fl

 owing. If not, slowly rotate the regula-

tor adjusting screw counterclockwise (CCW) until 

fl

 ow 

begins.

8.  Continue to slowly open the outlet (downstream) block 

valve until fully open.

9.  Observing the inlet (upstream) pressure gauge, rotate 

the adjusting screw clockwise (CW) slowly until the inlet 
pressure begins to rise. Rotate CW until the desired 
setpoint is reached.

10.  Continue to slowly open the inlet (upstream) block valve. 

If the inlet (upstream) pressure exceeds the desired 
setpoint pressure, rotate the adjusting screw (CCW) 
until the pressure decreases.

11. When 

fl

 ow is established steady enough that both the 

outlet and inlet block valves are fully open, begin to 
slowly close the bypass valve if installed.

12. Develop system 

fl

 ow to a level near its ex pect ed normal 

rate, and reset the regulator setpoint by turning the 
adjusting screw CW to increase inlet pressure, or CCW 
to reduce inlet pressure.

13. Reduce system 

fl

 ow to a minimum level and observe 

setpoint. Inlet pressure will rise from the setpoint of Step 
9. (Ensure that this rise does not exceed the stated upper 
limit of the range spring by greater than 50% i.e. 30-80 
psig (2.07 - 5.52 Barg) range spring, at maximum 

fl

 ow 

the inlet pressure should not exceed 1.5 x 80 (5.6 Barg) 
or 120 psig (8.3 Barg). If it does, consult factory.)

14. Increase 

fl

 ow to maximum level if possible. Inlet (up-

 stream or P

1

) pressure should rise. Readjust setpoint 

as necessary at the normal 

fl

 ow rate.

IV. STARTUP

* NOTE:

  

Systems sequencing operations at startup, normal opera-

tion, failure mode(s), and shutdown must assure that the pressure 
(P

Load

) on the spring chamber does not exceed the pressure regis-

tering on the wetted side of the diaphragm.  Should this "pressure 
reversal" occur, particularly to metal diaphragms, the diaphragm 
may be permanently damaged and cause improper operation.

P

1

 > P

Load

Pressure reversal is normally caused by the inlet pressure 
to a regulator being interrupted (automatically or manually).

1.  Ensure that the proper range spring is indicated to be 

within the regulator by inspection of the unit's name plate. 
Apply setpoint pressures that are only within the stated 
range.

2. 

When stating direction of rotation of the adjustment screw, 
the view is with respect to looking down towards the 
adjusting screw or its normal location.

3. 

Start with the block valves closed. A bypass valve may be 
used to maintain inlet pressure in the upstream system 
without changing the following steps.

4.  Remove closing cap, if installed. Relax the range spring 

by turning the adjusting screw counterclockwise (CCW) 
a minimum of three (3) full revolutions. This reduces the 
inlet (upstream) pres sure setpoint.

5.  If it is a “hot” piping system, and equipped with a by-

pass valve, slowly open the bypass valve to pre-heat 
the system piping and to allow slow expansion of the 
piping. Ensure proper steam trap operation if installed. 
Closely monitor inlet (upstream) pressure, via gauge, to 
ensure not over-pressurizing. NOTE: If no bypass valve 
is installed, extra caution should be used in starting up 
a cold system; i.e. do everything slowly.

6.  Crack open the inlet (upstream) block valve.

III. PRINCIPLE OF OPERATION

1.  Movement occurs as pressure variations register on 

the diaphragm. The registering pressure is the inlet, 
P

1

 or upstream pressure. The range spring opposes 

di a phragm movement. As inlet pressure drops, the range 

spring pushes the diaphragm down, closing the port; 
as inlet pressure increases, the di a phragm pushes up 
and the port opens.

2. A 

com 

plete diaphragm failure will cause the outlet 

process 

fl

 uid to mix with the loading 

fl

 uid.

SECTION III

SECTION IV

Summary of Contents for BQ

Page 1: ...or Back Pressure Relief Station CAUTION This is not a safety device and must not be substituted for a code approved pressure safety relief valve or a rupture disc SECTION II SECTION I WARNING Themaxim...

Page 2: ...of Step 9 Ensurethatthisrisedoesnotexceedthestatedupper limit of the range spring by greater than 50 i e 30 80 psig 2 07 5 52 Barg range spring at maximum flow the inlet pressure should not exceed 1 5...

Page 3: ...efertoFigure1forbasicconstruction Figure3for differential construction and Figure 2 for cryogenic construction Forablow upofthecompositionseat trim see Figure 4 4 Whencounterclockwise CCW orclockwise...

Page 4: ...n to the following torques C Special Instructions for Diaphragm Replacement 1 FortheOption 1 6DifferentialConstruction reas semblethediaphragmsubassemblyinSub Section B Step 12 as follows assemble par...

Page 5: ...replace with larger unit B Plugged trim B Remove trim and check for plugged holes in cylinder C Incorrect range spring screwing out CCW of adjusting screw does not allow bringing pressure level to a...

Page 6: ...kits where possible METHOD A USE OF PRODUCT CODE Step 1 If available obtain the 18 character product code num ber from a The Bill of Materials sheet attached herein b The metal tag attached to the re...

Page 7: ...nder 4 Diaphragm 5 Piston Gasket 6 Diaphragm Gasket 7 Hex head Cap Screw Flange Bolting 8 Nut Flange Bolting 9 Piston Cap Screw 10 Pressure Plate 11 Range Spring 12 Spring Button 13 Adjusting Screw 14...

Page 8: ...Cashco Inc P O Box 6 Ellsworth KS 67439 0006 PH 785 472 4461 Fax 785 472 3539 E mail sales cashco com exportsales cashco com Printed in U S A IOM BQ...

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