31N-IOM

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MODEL 31-NPressure Reducing Service Regulator

SECTION I

II. INSTALLATION

1. An inlet block valve should always be installed.An outlet block valve is recommended.

2. If service application is continuous such that

shutdown is not readily accomplished, it is rec-ommended that an outlet block valve and a manualbypass valve be installed.

3. Pipe unions are recommended to be installed toallow removal from piping. Trim can be changedwithout removal from pipeline.

4. An outlet pressure gauge should be located ap-proximately 10 pipe diameters downstream, andwithin sight.

5. All installations should include a downstream re-

lief device if the inlet pressure could exceed thepressure rating of any downstream equipment.

A downstream safety relief valve or a rupturedisc is absolutely required if the inlet P1 pres-sure exceeds 100 psig (6.9 Barg) under anynormal or upset conditions.

SECTION II

I. DESCRIPTION AND SCOPE

The Model 31-N is a pressure reducing service regulator used to control downstream (outlet or P2) pressure to levelsbetween 416 WC (115400 mm H2O). Sizes are 3/4, 1", 1-1/2" and 2" (DN20, 25, 40 and 50).

The unit is designed for gaseous service only.

Refer to Technical Bulletin 31-N-TB for sizing, application and selection recommendations.

INSTALLATION, OPERATION & MAINTENANCE MANUAL (IOM)

WARNING

1. Model 31-N does not include an internal relief mechanism. Overpressure protection requires use of a downstreamsafety relief valve or rupture disc.

2. User to determine acceptance of non-relieving design by federal, state, and/or local codes.3. IF GAS IS DETECTED BY SMELL, CONTACT YOUR GAS COMPANY IMMEDIATELY.

4. User to comply with instructions, operating requirements and maintenance requirements located herein in IOM-31-N.

WARNING

The maximum outlet pressure listed on the nameplate isthe upper operative limit for the sensing diaphragm.

Higher pressures could damage the internals. (Field hy-drostatic or pneumatic pressure tests frequently destroydiaphragms. DO NOT HYDROSTATIC OR PNEUMATIC

PRESSURE TEST THRU AN INSTALLED UNIT EXPOSINGTHE OUTLET PORTION OF THE REGULATOR TO PRES-SURES GREATER THAN 50 PSIG (3.45 BARG) FAILURE

TO HEED MAY RESULT IN CATASTROPHIC FAILURE WITHFLYING PARTS AND POSSIBILITY OF PERSONAL INJURY!ISOLATE FROM TEST.)

CAUTION

Installation of adequate overpressure protection is recom-

mended to protect the regulator from overpressure andall downstream equipment from damage in the event ofregulator failure.

CAUTION

For welded installations, all internal trim parts, seals anddiaphragm(s) must be removed from regulator body prior towelding into pipeline. The heat of fusion welding will dam-

age non-metallic parts if not removed. NOTE: This doesnot apply to units equipped with extended pipe nipples.

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7. In placing thread sealant on pipe ends prior to

engagement, assure that excess material is re-

6. Clean the piping of all foreign material includingchips, welding scale, oil, grease and dirt beforeinstalling the regulator. Strainers are recom-mended.

moved and not allowed to enter the regulator uponstartup.

8. FlowDirection:Installsotheowdirectionmatchesthe arrow cast on the regulator body.

9. Refer to Figure 2. Regulator may be rotatedaround the pipe axis 360, and may be installed

in a horizontal or vertical pipeline. Four orientation/arrangement assembly positions are standard. Ori-ent to prevent the spring chamber vent hole fromcollecting rainwater or debris. Reorient actuatoraround the stem axis 360 if necessary.

10. Regulators are not to be direct buried under-ground.

11. For insulated piping systems, recommendation isto not insulate regulator.

12. Cashco does not recommend eldweldingon

the body of the regulator. If weld connections aredesired, specify Opt-32, extended plain end pipenipples.

SECTION III

b. Model 31-N; for higher capacities and higherpressures (4 WC2 psig) (100 mmH2O0.14Barg).

3. Internals movement occurs as pressure variationsregister on the diaphragm. The registering pres-sure is controlled outlet pressure, P2, or down-stream pressure. The range spring opposesupwards movement of the diaphragm due to the

Figure 1Recommended Piping Schematic For

Pressure Reducing Station

Position 1 Position 2 Position 3 Position 4

FOR VERTICAL PIPING

FOR HORIZONTAL PIPING

Position 1 Position 3Position 2 Position 4

Figure 2

III. PRINCIPLE OF OPERATION

1. Refer to internals drawings Figures 5 thru 8.

2. For inch W.C. (mmH20) reducing service regulators,Cashco offers two Models to choose from:

a. Model 31-N; for smaller capacities and lowerpressures (416 WC) (100400 mmH2O);

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P2 pressure. As outlet pressure drops, the rangespring pushes the diaphragm down, opening theregulators port via the linkage lever travel. Asoutlet pressure increases, the diaphragm pushesup against the range spring and the port closes.

4. Model 31-N includes a linkage lever in its mech-anism. The linkage lever allows the regulator to

operate ow-to-open (FTO)and providesplugtravel multiplication thru the lever length ratio.

5. Aspiration (jet) effect is developed by properlylocating the windows of the loading ring. Whenproperly positioned, a high velocity path is intro-duced. This causes a corresponding decrease instatic pressure to be developed at a location thatallows this decreased pressure to register into thelower case and beneath the diaphragm. The netresult is to pull the diaphragm down and open the

valve port, providing higher unit capacity.

6. A complete diaphragm failure will cause the regu-lator to fail open.

SECTION IV

IV. STARTUP

1. Assure that the proper range spring is indicated tobe within the regulator by inspection of the unitsnameplate. Apply setpoint pressures that are onlywithin the stated range.

2. When stating direction of rotation of the adjustmentscrew, the view is with respect to looking downtowards the closing cap or its normal location.

3. Start with the block valves closed. A bypass valvemay be used to maintain outlet pressure in thedownstream system without changing the followingsteps.

4. Remove closing cap on top of spring chamber.Relax the range spring by turning the adjustmentscrew CCW a minimum of three (3) full revolutions.This reduces the outlet (downstream) pressure

setpoint.

5. Crack open the outlet (downstream) block valve.

6. Slowly open the inlet (upstream) block valve ob-serving the outlet (downstream) pressure gauge.Partially close off the bypass valve, if open. De-termineiftheregulatorisowing.Ifnot,slowlyrotate the regulator adjustment screw CW untilowbegins.

7. Continue to slowly open the inlet (upstream) blockvalve until fully open.

8. Continue to slowly open the outlet (downstream)block valve, especially when the downstream pip-ing system isnt pressurized. If the outlet (down-stream) pressure exceeds the desired pressure,

closetheinlet(upstream)blockvalverst,thenthe outlet (downstream) block valve, and go toStep 4, then return to Step 6.

9. Whenowisestablishedsteadyenoughthattheoutlet (downstream) block valve is fully open, beginto slowly close the bypass valve if installed.

10. Developsystemowtoalevelnearitsexpectednormal rate, and reset the regulator setpoint perSection VII.

11. Reducesystemowtoaminimumlevelandob-

serve setpoint. Outlet pressure may rise from thesetpoint of Step 10. The maximum rise in outletpressureondecreasingowshouldnotexceedthestated upper limit of the range spring by greater than10%; i.e. 5.58.0 WC (140200 mmH2O) rangespring,atlowowtheoutletpressureshouldnotexceed 8.8 WC (224 mmH2O). If it does, consultfactory.

SECTION V

V. SHUTDOWN

1. On systems with a bypass valve, and where sys-tem pressure is to be maintained as the regulatoris shut down, slowly open the bypass valve whileclosing the inlet (upstream) block valve. Fullyclose the inlet (upstream) block valve. (When onbypass, the system pressure must be constantlyobserved and manually regulated.) Close the outlet(downstream) block valve.

2. If the regulator and system are to both be shut-down, slowly close the inlet (upstream) blockvalve. Close the outlet (downstream) valve onlyif regulator removal is required.

WARNING

Do not walk away and leave a bypassed regulatorunattended.

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1ProductofFisherScienticCompany

SECTION VI

VI. MAINTENANCEA. General:

1. Maintenance procedures hereinafter are basedupon removal of the regulator from the pipelinewhere installed.

2. Owner should refer to owners procedures forremoval, handling and cleaning of reusableparts, the disposal of non-reusable parts, i.e.gaskets, suitable solvents, etc.

NOTE:Model 31-N does not contain any asbestosmaterials.

3. If desired, gaskets may be oiled, or coated withgasket sealant or thread sealing compound,providedthesealantiscompatiblewiththeu -id. (See below for oxygen cleaned valves.)

4. Valves originally supplied as special cleaned(Opt-56) are assembled using special sealant,Fluorolube GR-3621, or equivalent. Cashco,Inc., recommends following factory cleaningspecication#S-1542,orequivalent.Contactfactory for details.

5. When directions such as upwards, downwards,leftwards or rightwards are given, they are withrespect to Figures 5 and 6.

When counter clockwise (CCW) or clockwise(CW) rotations are indicated, they are withrespect to:

a. Spring Chamber as viewed from abovelooking down towards the closing cap orits normal location.

b. Body as viewed looking into the body cav-ity with the actuator assembly removed.

B. Diaphragm Replacement:

1. Securely install the body (1) in a vise with thespring chamber (4) directed upwards.

2. Remove closing cap (5). Relax range spring

(17) by turning adjustment screw (18) CCWuntil removed from spring chamber (4); countnumber of full revolutions and record below.

No. of revolutions to remove adjustmentscrew (18) ____________________ .

3. Paint or embed a match mark between lowercase casting (3) and spring chamber casting(4)alongangedarea.

4. Removealldiaphragmangenuts(10)andscrews (9).

5. Remove spring chamber (4) and range spring(17).

6. Pry up the diaphragm (12) from around theperimeter of the lower case (3) diaphragmangetoassurethatthediaphragm(12)isnot sticking.

7. Grasp protruding stop post (19) and lift up-wards and rightwards to disengage linkagelever (21) from circular opening of lower dia-phragm plate (20). Fully remove diaphragm

sub-assembly (DSA).

8. Place the ear of the lower diaphragm plate(20) into a soft jawed vise and fully secure,with stop post (19) pointed upwards. Place awrench on the hex surface of stop post (19)and loosen by rotating CCW (viewed fromabove).

9. Graspupperdiaphragmplate(13)withngersand continue to loosen stop post (19) until re-moval. Finger remove washer (16), and nylonbushing (15). Lift upper diaphragm plate (13),

together with stuck-on diaphragm (12) awayfrom lower diaphragm plate (20), and placeon bench top.

WARNING

SYSTEM UNDER PRESSURE. Prior to performing any

maintenance, isolate the regulator from the systemand relieve all pressure. Failure to do so could resultin personal injury.

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10. While holding upper diaphragm plate (13)by palm of hand, hand-pull diaphragm (12)away from upper diaphragm plate (13). (NOTE:The diaphragm (12) is adhered to the upperdiaphragm plate (13) with adhesive.) Rotateand repeat until the diaphragm (12) is fully re-moved. Discard used diaphragm (12). Removeremaining adhesive from upper diaphragm

plate (13).

11. Examine upper diaphragm plate (13) forbending or distortion. Replace if deformationis present.

12. Spread a thin layer of compatible adhesiveonto the cleaned upper pressure plate (13),staying away from the edges approximately1/2" (12 mm). Place a new diaphragm (12)downontoaatsurfacewiththediaphragms(12)angeedgesup,formingabowlwithahole in the center. Carefully lift the upper dia-

phragm plate (13), invert 180, and lower intothe diaphragm (12) bowl with the adhesivemeeting the diaphragm (12); align the upperdiaphragm plate (13) as concentrically as able.Carefully lift the adhered parts (12)(13) andinvert 180. Align the diaphragm (12) hole andupper diaphragm plate (13) hole concentrically.Work out any bubbles formed between thediaphragm (12) and the upper diaphragmplate(13)usingaattoolasnecessary.Oncealigned, set adhered parts (12)(13) back downto allow adhesive approximately 30 minutessetting/drying time. Note: Adhesive must be

BOSTIK#4035orequal.

13. Place the adhered diaphragm (12) and theupper diaphragm plate (13) back onto thelower diaphragm plate (20) still resting in thevise. Position/align the diaphragm (12) withrespect to the lower diaphragm plate (20) asindicated in Figure 3; failure to align properlymay cause poor unit performance.

14. Set nylon bushing (15) into hole in the top ofthe upper diaphragm plate (13). Place washer(16) on top of nylon bushing (15).

15. Insert stop post (19) thru the center openingof stacked parts (16, 15, 13, 12) and engagethreaded end of stop post (19) into lowerdiaphragm plate (20). Carefully tighten stoppost (19) to ensure concentricity of stackedparts (16, 15, 13, 12). Tighten stop post (19)to 1820 in-# (2.02.3 N-M) torque. Thiscompletes diaphragm sub-assembly (DSA);remove from vise.

Figure 3

16. Position the diaphragm sub-assembly (DSA)towards the rightwards of center of the lowercase (3) with the opening of the lower dia-phragm plate (20) oriented perpendicular tothe linkage lever (21). Insert the linkage lever(21) thru the opening of the lower diaphragm

plate (20). Align the bolt holes of diaphragm(12) with the bolt holes of the lower case(3).

17. Place range spring (17) over stop post (19),and align properly by setting spring (17) overwasher (16) and nylon bushing (15) so thatthe spring (17) rests on upper diaphragm plate(13).

18. Clean threads of spring chamber (4) barrelthoroughly using suitable solvent.

19. Set spring chamber (4) onto lower case (3)aligning matchmarks of Step 3 previous.

20. Insertscrews(9)intoangeboltholes.En-gage nuts (10). Align and push nuts (10) upagainst the underneath side of the lower case(3)ange,ensuringthatthetipsofthenutsare not improperly positioned due to the smalllugsonthelowercaseange.Hand-tightenall screws (9) and nuts (10).

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21. In an alternating cross-pattern, tighten screws(9) in one revolution increments. Repeatpattern until torque reaches 2530 in-#(2.83.4 N-M).

22. Engage adjustment screw (18) the same num-ber of revolutions as recorded from Step 2previous.

23. Remove and replace closing cap gasket (6).Replace closing cap (5) and nger tightenonly.

C. Trim Replacement:

1. Place body (1) into a vise and secure.

2. Loosen both cap screws (11) bolting the ac-tuator assembly (AA) to the body (1). Holdingthe actuator assembly (AA) in hand, rotate capscrews (11) to removal. Note: The actuator

assembly (AA) may be rotated around thestem (24) axis during this procedure.

3. Place actuator assembly (AA) in a vise or ona workbench to allow cleaning of the gasket(8)surfaceofthelowercase(3)withaattool. Use spray solvent as necessary (do notimmerse).

4. Remove rubber seat (27) from end of stem(24); examine and discard. Place new seat(27) onto end of stem (24). For sizes 1-1/2"and2"(DN40&50),adeectorring(32)isincluded. Ensure the proper orientation of thedeectorring(32)whenpushingthenewseat(27) into position. (See Figure 6.)

5. Return to the body (1) in vise. Observe positionof split in loading ring (25, 33) with respectto proper location as indicated in Figure 4.Using both thumbs, push the interior walls topry apart the split of the loading ring (25, 33),untilthering(25,33)slipsofftheorice(26).Remove the loading ring (25, 33).

6. Remove the body (1) from the vise. Clean thegasket(8)recessofthebody(1)withaattool. Solvent clean body (1). Replace body(1) into vise.

7. Examineorice(26)fordamagetotheseat-ingedge.Replaceorice(26)ifdamaged.Toremoveorice(26),placeasocketovertheorice(26)hex,androtateCCWtoloosen/remove.Whenreplacingorice(26)usepipesealant PLS-2 or PST Loctite. Rotate CW

totightenorice(26);tightento3540ft-#(47.454.2 N-M). Note:Do not replace orifce(26) without replacing seat (27).

8a. Examineglass-llednylonloadingring(25)for sizes 3/4" and 1" (DN20 & 25). This piecemay wear notches at the location where theloadingring(25)touchestheorice(26)hex

points. It is necessary that the loading ring(25)beclampedsnuglytotheorice(26);replaceloadingring(25)iftisloose.

8b. Examine SST loading ring (33) for sizes1-1/2" and 2" (DN40 & 50). Assure that thethree impression points (2 rectangular, 1circular) are still present; if an impressionpoint is missing, replace loading ring (33). Itis necessary that the loading ring (33) clampsnuglytotheorice(26)topreventrotation;replaceloadingring(33)iftisloose.

9. Refer to Figure 4 for proper alignment ofloading ring (25, 33) split. Using both thumbs,push the interior walls of the loading ring (25,33) apart and lower the loading ring (25, 33)down into the body (1) cavity, and over theorice(26).Releasethumbs.Assureloadingring (25, 33) clamps snuggly. Repeat untilloading ring (25, 33) is properly located perFigure 4. The split of the loading ring (25)is factory assembled along the body (1) axialcenterline for body sizes 3/4" and 1" (DN20 &25), and for loading ring (33) at the 21 markon the body (1) for body sizes 1-1/2" and 2"(DN40 & 50). For all body sizes the split inthe loading ring (25, 33) is located oppositetheowdirection.

10. Return to the actuator assembly (AA). Ensurethat snap ring (7) is into recess of retainerange(2)properly.

11. Place gasket (8) into body (1) recess.

12. Reposition actuator assembly (AA) into posi-tion by hand, aligning body (1) bolt holes withretainerange(2)boltholes.Inserttwocapscrews(11)andngertighteninanalternatingcross pattern. Note:Make sure the snap ring(7) is not allowed to spring out of its recess inthe retainer ange (2) during this procedure.

13. Wrench tighten cap screws (11) in an alter-natingcrosspatterntoatorqueof810ft.-#(10.813.5N-M).

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BODY SIZES 3/4" & 1" (DN20 & 25)

BODY SIZES 1-1/2" & 2" (DN40 & 50)

Figure 4

D. Linkage Lever and Stem Replacement:

1. Remove diaphragm sub-assembly (DSA) asdescribed in Section VI.B., Steps 1 thru 7.

2. Remove lower casing (3) from body (1) asdescribed in Section VI.C., Steps 1 and 2.

3. Remove both machine screws (22), washers(37) and retaining linkage pivot pin (23). (SeeFigure 8.) Lift linkage lever (21) from its posi-tion of engagement with stem (24) bringinglinkage pivot pin (23) along. Remove pin (23)and inspect for wear, bending, etc. Replacepin (23) if required.

4. Inspect linkage lever (21) for bending, dis-tortion, etc. Replace lever (21) if required.

5. Inspect stem (24) to assure that there is nobending in the slot area where the stem (24)and linkage lever (21) engage. Replace stem(24) if there are any signs of bending or fric-tion in the stem (24) guide or engagementzones.

6. Insert linkage pivot pin (23) thru hole in link-age lever (21). Simultaneously engage thelinkage lever (21) and the stem (24), andplace pin (23) ends back into the cradlesof the pedestal supports of the lower casing(3), replace washer (37), engage and tightenboth machine screws (22).

7. Reinstall diaphragm sub-assembly (DSA) andspring chamber (4) as described in SectionVI.B., Steps 17 thru 24.

8. Reinstall actuator assembly (AA) to body (1)as described in Section VI.C., Steps 12 and13.

E. Range Spring Replacement:

1. Remove closing cap (5) from spring chamber(4).

2. Rotate adjustment screw (18) CCW to re-moval.

3. Remove existing range spring (17).

4. Install new range spring (17) (refer to Table2).

5. Put thread locking compound on threads ofspring chamber (4) and on adjustment screw(18).

6. Engage adjustment screw (18) into spring

chamber (4) by rotating CW until the rangespring (17) begins to compress.

7. Shop calibrate the setpoint per Section VII.

8. Remove old nameplate (28) and drive screws(29); install new nameplate with correct rangespring indicated.

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SECTION VII

VII. SETPOINT ADJUSTMENT/CALIBRATION

1. Establish ow thru the regulator, preferably arelativelylowowrate,approximately50SCFH.

2. Remove closing cap (6) by rotating CCW.

3. If P2 outlet pressure is less than desired, rotateadjustment screw (18) CW; if higher than desired,rotate adjustment screw (18) CCW.

4. Reinstall closing cap (6) using pipe joint lubricant/sealantonthreads;ngertightenonly.

5. Increaseowratetonearmaximum.Checkforadequate P2. Repeat Steps 2 thru 4. as required.

NOTE:Athigherowrates,removaloftheclos -ing cap (6) can induce an instability. If this occurs,make adjustment, and quickly replace closing cap(6), then observe the new setpoint.

SECTION VIII

VIII. TROUBLE SHOOTING GUIDE

Possible Cause Remedy

A. Oversizedvalve,insufcientrangeability. A1.

A2.

Checkactualowconditions;consideruseofsmallerorice.Reduce P1 pressure if possible.

B. Undersizedvalve,insufcientrangeability. B1.

B2.

Checkactualowconditions;consideruseoflargerorice.Increase P1 pressure if possible.

C. High Inlet P1 pressure. C. Reduce P1 pressure to 60 psig (4.14 Barg) or lower.

D. Loading ring is loose. D. Replace loading ring.

E. Variation of Inlet P1 pressure. E. P2 pressure setpoint will vary as P1 pressure varies;provide stable P1 inlet pressure.

F. Dirty service gas; unit becomes unresponsive. F1.F2.

Clean gas stream with liquid separators, strainers, etc.Disassemble and clean buildup on a routine basis.

G. Downstream over-pressurization. G1.

G2.

G3.

G4.G5.G6.

Install safety relief valve or rupture disc with a 50 psig(3.45 Barg) setting or lower.Disassemble actuator assembly and check for bentupper diaphragm plate. Check for relief cap distortion.Flow is tightly shutoff downstream of regulator;relocate shutoff valve.Seat leakage; replace seat.Failureoforicethreadsealant;reinstallorice.Correct process conditions/controls that cause P2pressure to become greater than 50 psig (3.45 Barg).

H. Process pressure pulsations inlet or outlet. H1.

H2.

Stabilize process pressures at source or end use.

Install volume tanks to reduce pulsation effects.J. Adjustment screw loosening, P2 outlet pressure

decreasing.J1.J2.

Place locking compound on threads of adjustmentscrew.Stabilizeowtoreducevibrations.

1. Variation in outlet P2 pressure.

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A. Diaphragm failure. A. Replace diaphragm.

B. Downstream over-pressurization. B1.

B2.

B3.

B4.

B5.

Correct process conditions/controls that cause P2pressureto become greater than 50 psig (3.45 Barg).Install safety relief valve or rupture disc with a 50 psig

(3.45 Barg) setting or lower.Disassemble actuator assembly and check for bentupper diaphragm plate. Check for relief cap distortion.Flow is tightly shutoff downstream of regulator;relocate shutoff valve.Seat leakage; replace seat.

C. Body gasket failure. C1.C2.

Replace body gasket.Snap ring misinstalled; reinstall with snap ring properlypositioned.

2. External leakage.


A. Closing cap removed. A. Reinstall gasketed closing cap.

B. Plug vent. B. Clean vent opening in spring chamber.

3. Unstable Operation.

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NEW REPLACEMENT UNIT:

Contact your local Cashco, Inc., Sales Represen-tative with the Serial Number and Product code.With this information they can provide a quotationfor a new unit including a complete description,price and availability.

7

IX. ORDERING INFORMATION:

NEW REPLACEMENT UNIT vs PARTS "KIT" FOR FIELD REPAIR

To obtain a quotation or place an order, please retrieve the Serial Number and Product Code that was stampedon the metal name plate and attached to the unit. This information can also be found on the Bill of Material(parts list) that was provided when unit was originally shipped.) (Serial Number typically 6 digits). Product Code

typicalformatasfollows:(lastdigitisalphacharacterthatreectsrevisionlevelfortheproduct).

PARTS "KIT" for FIELD REPAIR:

Contact your local Cashco, Inc., Sales Represen-tative with the Serial Number and Product code.Identify the parts and the quantity required to repair

the unit from the Bill of Materials sheet that wasprovided when unit was originally shipped.

NOTE: Those part numbers that have a quantity indicatedunder "Spare Parts" in column "A reectminimumparts required for inspection and rebuild, - "SoftGoods Kit". Those in column B include minimumtrim replacement parts needed plus those "SoftGoods" parts from column "A".

If the "BOM" is not available, refer to the cross-sectional drawings included in this manual for partidenticationandselection.

Local Sales Representative will provide quota-tion for appropriate Kit Number, Price and Avail-ability.

CAUTIONDo not attempt to alter the original construction of anyunit without assistance and approval from the factory.All purposed changes will require a new name plate with

appropriate ratings and new product code to accomodatethe recommended part(s) changes.

SECTION IX

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Figure 5

3/4" & 1' Body Sizes

Figure 61-1/2" & 2" Body Sizes

Figure 8Partial Plan: Linkage Lever (21) Pedestals

Linkage Lever

(21) mounts be-tween pedestals;

not shown for

clarity.

Item

No. Description

1 Body2 Retainer Flange3 Lower Case4 Spring Chamber5 Closing Cap6 Gasket (Closing

Cap)7 Snap Ring8 Gasket (Body)9 Machine Screw

10 Nut, Hex.11 Cap Screw12 Diaphragm13 Upper Diaphragm

Plate15 Nylon Bushing16 Washer17 Range Spring18 Adjustment Screw19 Stop Post20 Lower Diaphragm

Plate21 Linkage Lever22 Machine Screw23 Linkage Pivot Pin24 Stem25 Nylon Loading

Ring 26 Orice

27 Seat28 Nameplate29 Drive Screw30 Warning Plate 32 DeectorRing

33 SST LoadingRing

34 Bug Proof VentPlug (not shown)

37 Washer(at)* DSA Diaphragm

Sub-Assembly

Figure 7Partial Section:

Body Assembly (BA)-to-Actuator Assembly(AA) Connection

Pedestals

* Diaphragm Sub-Assembly (DSA) is madeup of Item Nos. 12, 13, 14, 15, 16 & 19.

Pedestal

Body Assembly (BA) Actuator Assembly (AA)

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Cashco, Inc.P.O. Box 6Ellsworth, KS 67439-0006PH (785) 472-4461FAX (785) 472-3539www.cashco.comE-mail: [email protected]

[email protected] in U.S.A. IOM-31-N

31N-IOM

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