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IOM-PGR-2

2

1.  When a loading pressure – P

Load

 – is applied to 

the top side of a diaphragm, the outlet controlled 
pressure – P

2

 – will balance at approximately        

.90 – .98 of the loading pressure - P

L

.

2.  Movement occurs as pressure variations register 

on the diaphragm.  The registering pressure is the 
outlet, P

2

, or downstream pressure.  The loading 

pressure fluid op pos es di a phragm move ment.  
As outlet pres sure drops, the loading pressure 
push es the di a phragm down, opening the port; as 
outlet pres sure increases, the diaphragm pushes 
up and the port opening closes.

3.  A diaphragm failure will tend to cause the reg u la tor 

to fall below setpoint. A loss of loading pres sure 
while inlet pressure is imposed will cause the  
regulator to fail close.

V. STARTUP

1  Start with the block valves closed.

2.  Rotate the adjusting screw (30.17) on the pilot 

valve CCW so that main regulator is trying to be 
con trolled at 0 psig pressure.  

DO NOT

 rotate 

the adjusting screw on the stabilizer, stabilizer 
was preset and calibrated at the factory.

 NOTE:  

If an adjustment to the stabilizer is necessary, 
it is recommended that a gauge be installed in 
optional port downstream of stabilizer. Once flow 
is established, if an adjustment is needed, the 
stabilizer should be set at 8 to 10 PSI above the 
set point attempting to be controlled.

3. 

DO NOT

 rotate knob on metering valve, it was 

preset at the factory at 2 to 3 full revolutions from 
closed position.  

DO NOT

 close metering valve.

4.  If it is a “hot” piping system, and equipped with 

a bypass valve, slowly open the bypass valve 
to preheat the system piping and to allow slow 
ex pan sion of the piping. Closely monitor outlet 
(down stream) pressure via gauge to ensure not 
over-pressurizing.  

NOTE: 

If no bypass valve is 

in stalled, extra caution should be used in starting 
up a cold system; i.e. do everything slowly.

5.  Crack open the outlet (downstream) block valve 

to approximately 10% full open.

6.  Slowly open the inlet (upstream) block valve to 

about 25% open.  Rotate the adjusting screw 

SECTION V

            CAUTION

DO NOT HYDROSTATIC TEST THROUGH AN IN STALLED 
UNIT; ISOLATE REGULATOR FROM TEST.  The "OUTLET 
RATING" as printed on the name plate is the rec om mend ed 
“upper op er at ing limit” for the sens ing di a phragm.  Higher 
pres sures could cause internal dam age.  In ad di tion, note 
on the nameplate that the Inlet and Outlet pres sure and 
temperature ratings are at different levels.

          CAUTION

Do not walk away and leave a bypassed reg u la tor 
unattended!

(30.17) on the pilot valve CW to increase setpoint 
pressure upwards until the main valve is flowing. 
Observe the outlet pressure gauge to ensure not 
over pressurizing.

7.  Continue to slowly open the inlet (upstream) block 

valve until fully open.

8.  Continue to slowly open the outlet (downstream) 

block valve, especially when the downstream 
piping system isn’t pressurized.  If the outlet 
(down stream) pressure exceeds the desired pres-
 sure, close the inlet block valve and go to Step 2. 
Close bypass valve approximately 25%, re peat 
pro ce dure.

9.  When flow is established steady enough that the 

outlet (downstream) block valve is fully open, begin 
to slowly close the bypass valve if installed.

10.  Develop system flow to a level near its expected 

normal rate, and reset the regulator set point by 
rotating the adjusting screw (30.17) on the pilot 
valve CW to change the setpoint to the desired 
outlet pressure level.  If downstream pressure is 
unstable, rotate knob on metering valve in quarter 
turn increments CW or CCW to combat instabil-
ity.   

NOTE:

 

1/4 turn increments are used due to 

sensitivity, in some cases the changes to the P

2

 

are significant.

  

DO NOT

 rotate knob more than 

6 full revolutions from closed position. Metering 
valve is preset at factory 2 to 3 full revolutions from 
closed position. 

DO NOT

 close metering valve.

11.  Reduce system flow to a minimum level and 

observe pressure set point.  Outlet pressure will 
rise from the set point of Step.  The max i mum rise 
in outlet pres sure on de creas ing flow should not 
exceed the 10%.  If it does, consult factory.

SECTION IV

IV.  PRINCIPLE OF OPERATION

Содержание PGR-2

Страница 1: ...idespacebelow above andaroundregula tor for removal of parts during maintenance 3 Install block valves and pressure gauges to pro vide means for adjustment operation bypass or removal of the regulator...

Страница 2: ...the inlet upstream block valve to about 25 open Rotate the adjusting screw SECTION V CAUTION DO NOT HYDROSTATIC TEST THROUGH AN INSTALLED UNIT ISOLATE REGULATOR FROM TEST The OUTLET RATING asprintedon...

Страница 3: ...olate the regulator from the system and relieve all pressure Failure to do so could result in personal injury SECTION VI 3 Remove all diaphragm nuts 9 and bolts 8 4 Remove loading chamber 33 pressure...

Страница 4: ...concentrically within the body cap 5 opening 10 Slide the piston 15 slowly into place assuring that the piston 15 post slides into the female groove of the pusher plate 11 12 Place piston spring 17 i...

Страница 5: ...the center hole of the body and the seat 30 7 square end first 6 Placeonesealgasket 30 15 onepistonseal 30 14 and one seal gasket 30 15 into the center bore on top of the stem 30 8 See Detail A Ensur...

Страница 6: ...y in a vise Position so that vise closes over the inlet and the outlet connections DIAPHRAGM REPLACEMENT Inlet Filter ELEMENT INSIDE BODY COVER 2 Unscrew the filter cover from the body Remove old elem...

Страница 7: ...er s procedures 6 Slide the post end of the piston 60 14 slowly into the body cavity 7 Place piston spring 60 7 over spring hub of the piston 60 14 8 Apply pipe thread sealant to the body cap 60 6 thr...

Страница 8: ...and spray liquid leak de tectortotestaroundbodyandspringchamber for leakage Ensure that an outlet pressure is maintained during this leak test of at least mid range spring level i e 20 80 psig 1 4 5 5...

Страница 9: ...replace B Oversized regulator B Check actual flow conditions resize regulator for minimum and maxi mum flow if necessary replace with smaller regulator C Metering Valve may not be adjusted correctly...

Страница 10: ...can also be found on the Bill of Material BOM a parts list that was provided when unit was originally shipped Serial Number typically 6 digits Product Code typical format as follows last digit is alp...

Страница 11: ...ng Use 3 8 or 1 2 DN10orDN15 outerdiametertubingtoconnectthepilotsensing port to a location in the piping down stream of the main regulator If PGR 2 is constructed with self contained feature tubing a...

Страница 12: ...Body 3 Pressure Plate 5 Body Cap 8 Cap Screw Flange Bolting 9 Nut Hex Flange Bolting 11 Pusher Plate 12 Diaphragm 15 Piston 16 Cylinder 17 Piston Spring 18 Cylinder Gasket 33 Loading Chamber Recommen...

Страница 13: ...arts Pilot Assembly Vent to Atmosphere Sense Port Pilot Inlet The contents of this publication are presented for informational purposes only and while every effort has been made to ensure their accura...

Страница 14: ...o com Item No Description 60 1 Body 60 2 Spring Chamber 60 3 Pressure Plate 60 4 Pusher Plate 60 5 Spring Button 60 6 Body Cap 60 7 Piston Spring 60 8 Adjusting Screw 60 9 Lock Washer 60 10 Nut Pressu...

Страница 15: ...e The details of the assessment in terms of the individual Essential Health and Safety Requirements are listed in Table 1 Table 2 lists all of the models and options that were evaluated and along with...

Страница 16: ...of system components and tubing due to adiabatic compression of the system gas 3 Heating systems installed by the user could possibly increase the surface temperature and must be evaluated by the user...

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