Cashco POSR-2 Manuel d'utilisateur télécharger pdf

MODEL POSR-2

PILOT OPERATED PRESSURE RE DUC ING REGULATOR

SECTION I

I. DESCRIPTION AND SCOPE

The POSR-2 is a pilot operated pressure reducing reg u la tor used to control downstream (P

) pressure. Sizes are

1", 1-1/2", 2", 3" and 4" (DN25, 40, 50, 80, 100). The unit is suitable for steam service only. Refer to Technical Bul-

letin POSR-2-TB for design conditions and selection recommendations. NOT RECOMMENDED FOR DEAD END

SERVICE.

SECTION II

II. INSTALLATION

A. General:

IOM-POSR-2

12-13

INSTALLATION, OPERATION & MAINTENANCE MANUAL (IOM)

6. Clean the piping of all foreign material in-

clud ing chips, welding scale, oil, grease and

dirt before installing the regulator. Strainers

are recommended.

B. Piping the Valve:

1. An inlet block valve should always be in-

stalled.

2. If service application is continuous such that

shut down is not readily accomplished, it is

recommended that an inlet block valve, outlet

block valve, and a manual bypass valve be

installed.

3. Pipe unions are recommended for NPT

screwed in stal la tions to allow removal from

piping.

4. An outlet pressure gauge should be located ap-

prox i mate ly ten pipe diameters down stream,

and within sight.

5. All installations should include a downstream

re lief device if the inlet pressure could ex-

ceed the pressure rating of any downstream

equip ment or the maximum allowable outlet

pres sure rating of the unit.

FIGURE 1

Recommended Piping Schematic for POSR-2

WARNING

Do not dead end (no ﬂ ow demand) downstream of POSR-2

if P

- Inlet Pressure is greater than max i mum allowable

outlet design pressure.

Max. Allowable

Spring Range Outlet Pressure

5-15 psig (0.34–1.03 Barg) 100 psig (6.9 Barg)

10–40 psig (0.69–2.8 Barg) 200 psig (13.8 Barg)

30–80 psig (2.1–5.5 Barg) 200 psig (13.8 Barg)

70–150 psig (4.8–10.3 Barg) 200 psig (13.8 Barg)

CAUTION

Installation of adequate overpressure pro tec tion is recom-

mended to pro tect the reg u la tor from overpressure and

all down stream equip ment from damage in the event of

regulator failure.

CAUTION

For welded installations, all internal trim parts, seals and

diaphragm(s) must be removed from reg u la tor body prior to

welding into pipeline. The heat of fusion welding will dam-

age non-metallic parts if not re moved. NOTE: This does

not apply to units equipped with extended pipe nip ples.

1 2 3 4 5 6 ... 19 20

Résumé du contenu

Page 1 - MODEL POSR-2

MODEL POSR-2PILOT OPERATED PRESSURE RE DUC ING REGULATORSECTION II. DESCRIPTION AND SCOPE The POSR-2 is a pilot operated pressure reducing reg u la

Page 2 - III. PRINCIPLE OF OPERATION

IOM-POSR-21021. Using a sharp, ﬂ at-edged tool, clean the gas- ket fac ings and all surfaces where a metal-to-metal joint occurs on the body (1), bonn

Page 3 - POSITION “VD”

IOM-POSR-2 11partial assembly of previous article above until centered over the peg. Lower partial assembly down onto peg until weight is resting on p

Page 4 - IV. START-UP

IOM-POSR-21257. Rig the reassembled main valve (MV) for over head hoisting. Re move temporary duct tape. Lift and remove from vise.E. Joining:1. Plac

Page 5

IOM-POSR-2 135. Remove hose from open end of jar. Open valve #2. Close valve #1. Place hose end back into jar. Follow a similar pro ce dure as in art

Page 6

IOM-POSR-2147. Slowly pressurize the inlet of the main valve (MV) and pilot valve (PV) to 100 psig (6.9 Barg). NOTE: If the pilot valve (PV) has any

Page 7

IOM-POSR-2 15SECTION IXNEW REPLACEMENT UNIT:Contact your local Cashco, Inc., Sales Rep re sen ta- tive with the Serial Number and Product code. With

Page 8

IOM-POSR-216NOTES

Page 9 - 4" 5/8" – 11 UNC

IOM-POSR-2 17NOTES

Page 10

IOM-POSR-218FIGURE 7FIGURE 8 ITEM NO. DESCRIPTION 19 Pipe Nipple 20 Tube Fitting 21 Tubing 26 90° Elbow 27 90° Street Elbow 28 Union 29 Pip

Page 11 - WARNING

IOM-POSR-2 19FIGURE 10POSR-2 Flanged End Con nec tionFIGURE 9MV – MAIN VALVE ITEM NO. DESCRIPTION 1 Body 2 Bonnet 3 Cylinder 4 Cylinder Head 5

Page 12 - VII. LEAK TESTING

IOM-POSR-2210. See Figure 2 for installation ori en ta tion for hor i zon tal or vertical piping. For best per for -mance Cashco rec om mends in sta

Page 13

ITEM NO. DESCRIPTION 1 Body 2 Spring Chamber 4 Plug & Seat Assembly 4.1 Valve Seat 4.2 Valve Plug 6 Screen 7 Spring 8 Valve

Page 14 - VIII. TROUBLE SHOOTING GUIDE

IOM-POSR-2 3FIGURE 2Orientation/ArrangementPOSITION “H”POSITION “VU”Pilot valve and main valve shipped as two units. Installer to connect between pilo

Page 15 - CAUTION

IOM-POSR-24the bleed oriﬁ ce. The reduced loading pres- sure on the upper side of the piston closes the main valve’s plug enough to restore the down

Page 16 - IOM-POSR-216

IOM-POSR-2 5SECTION VV. SHUTDOWNA. General1. On systems with a bypass valve, and where system pressure is to be maintained as the POSR-2 is shut down

Page 17 - IOM-POSR-2 17

IOM-POSR-262. Loosen locknut (20) by rotating CCW (viewed from above) ONLY two revolutions. Relax range spring (15) by turning adjusting screw (19) C

Page 18 - FIGURE 6

IOM-POSR-2 718. Remove seat gasket (8) using a tool with a bent sharp end. Discard the seat gasket (8).19. Using a sharp edged tool, clean all gaske

Page 19

IOM-POSR-28the bolts (17) before replacing into bolt hole. Fin ger-tighten nuts (18).41. Observe through opening in top of spring cham ber (2) to ens

Page 20

IOM-POSR-2 9not apply excessive sideways force to the cylinder (3). Move the ﬂ at tool fully around the bonnet-to-body joint to ensure being fully loo