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IOM-SLR-2

2

IV.  PRINCIPLE OF OPERATION

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

.

 (NOTE:

 

Fluc tu a tions in P

1

 – Inlet Pressure will cause a 

deviation in P

– Outlet Pressure due to inverse 

sym pa thet ic ratio effect.)  See Section VIII.

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.  A by pass valve 

may be used to maintain out let pres sure in the 
down stream sys tem without changing the fol low-
 ing steps.

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

4.  Crack open the outlet (downstream) block valve 

to approximately 10% full open.

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

about 25% open. Rotate the knob on the loading 
regulator CW to increase the setpoint pressure 
if necessary until the main regulator is flowing. 
Observe the outlet pressure gauge to ensure not 
over pressurizing.

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

valve until fully open.

7.  Continue to slowly open the outlet (downstream) 

block valve, especially when the downstream pip-
ing 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%, and re peat 
pro ce dure.

8.  When flow is established steady enough that the 

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

SECTION IV

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!

Model SLR-2 - External Sense

Non-Relieving
Loader & PI

Recommended Piping Schematic

For Pressure Reducing Station

Loader Relieves to outlet of Main Regulator

2.  Rotate the knob (4) of the loading regulator CCW  

three revolutions to decrease the set point pres-
sure of the main regulator.  

NOTE: 

If no set point 

is specified at the time of purchase, the knob (4) 
of the loading regulator is backed all the way off, 
CCW. Caution shoud be taken during start up to 
prevent exceeding the pressure drop across the 
seat, potentially damaging the seat.

3.  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 

Содержание SLR-2

Страница 1: ...alveanddamaging internal soft goods primarily the dynamic seal 4 DownstreamSensingInstallationConsiderations Internal or External Sensing a The regulator may be installed with inter nal or external se...

Страница 2: ...m block valve until fully open 7 Continue to slowly open the outlet downstream block valve especially when the downstream pip ing system isn t pressurized If the outlet down stream pressure exceeds th...

Страница 3: ...Seal w Metal Energizer 27 4 OR O Ring Seal SECTION VII Adetailedviewofthedynamicsidesealparts is shown in Figure 1 on the next page NOTE On regulators originally supplied as oxygen clean Opt 55 mainte...

Страница 4: ...or body in a vise with the cover dome 25 upwards 5 Loosen and remove the diaphragm flange bolts 11 and nuts 12 uniformly Set loading regulator aside 6 Place matchmarks on body 23 and cover dome 25 fla...

Страница 5: ...temperature limits Remove dynamic side seal 27 components Special care should be taken when using tools to remove the components to ensure that no scratches are imparted to any portion of the guide be...

Страница 6: ...tallation aid 2 Place wiper washer 17 1 into cup of Wiper Seal 16 Holding these parts 17 1 16 between thumb and forefinger insert into cage 19 at an approximate 45 angled approach with wiper washer 17...

Страница 7: ...ate against seat ring 21 during tightening 8 This completes ITA preliminary reassembly F Main Regulator Reassembly 1 Place body 23 in a vise 2 Reinstallinternalsensingdrilledplug 33 with compatible th...

Страница 8: ...einstall all flange bolts 11 and nuts 12 with nameplate 99 located under one bolt head Hand tighten nuts 12 10 Evenly tighten the body bolting 11 12 in an alternating cross pattern in one revolution i...

Страница 9: ...r SPRING UNDER COMPRESSION Prior to removing spring chamber relieve range spring compression by turning knob CCW until rotation comes to a complete stop Failure to do so may result in flying parts tha...

Страница 10: ...seat 12 11 Install new seat retainer 13 with seat 12 into body 1 cavity with the seat facing downward toward the angled seating sur face of the poppet 8 Tighten seat retainer to the following torque v...

Страница 11: ...ston subassembly per Section VI Steps M 1 M 7 2 With a 5 16 socket rotate seat retainer 13 CCW to remove from the body 3 Remove the pressed in seat 12 from re tainer 13 Remove poppet 8 and poppet spri...

Страница 12: ...iston Spring psig Barg LVPS psig Barg none none 0 0 0 0 2 5 14 34 3 21 2 14 1 2 07 14 1 07 1 07 4 10 28 6 9 6 41 4 28 SIZE ORIENTATION S O Factor Body Size in DN Orientation Cover Dome on Top Cover Do...

Страница 13: ...external sensing line C Oversized regulator C Check actual flow conditions resize regulator for minimum and maxi mum flow if necessary replace with smaller regulator D Too much variation in Inlet Pres...

Страница 14: ...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 alpha character that reflects revisio...

Страница 15: ...Internal Sensing Only 99 Nameplate Not Shown Not required on 2 CS SST Body Material Recommended Repair Parts Figure 7 Main Regulator Assembly The contents of this publication are presented for inform...

Страница 16: ...2 Actuator Post 7 3 Actuator Nut 7 4 Actuator Gasket 7 5 Actuator O ring 8 Poppet 9 Poppet Spring 10 Diaphragm Gasket 12 Seat 13 Seat Retainer 15 Range Spring 16 Spring Clip 21 Inline Filter 39 Snap i...

Страница 17: ...ct leads to heating or cooling of the process gas depends on the process gas and the inlet and outlet pressures The system designer is responsible for determining whether the process gas temperature m...

Страница 18: ...5 DA6 DA8 DA0 DA1 DAP SAP SLR 1 SLR 2 PTR 1 ALR 1 ULR 1 PGR 1 BQ BQ OPT 45 BQ CRYO 123 123 CRYO 123 OPT 45 123 OPT 46G 123 1 6 123 1 6 OPT 45 123 1 6 OPT 46G 123 1 6 S 123 1 6 S OPT 40 1000HP 1000HP O...

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