Cashco 6987 User Manual download pdf

II. INSTALLATION

IOM-6987

12-13

MODEL 6987

BACK PRESSURE / RELIEF REGULATOR

SECTION I

I. DESCRIPTION AND SCOPE

The Model 6987 is a back pressure relief regulator used to control upstream (inlet or P

) pressure. Sizes are 1/2" and

3/4" (DN15 and 20). With proper trim utilization, the unit is suitable for air, inert gases, water, fuel oil and chemicals.

The Model 6987 is not normally utilized in steam service. Refer to Technical Bulletin 6987-TB for design conditions

and se lec tion rec om men da tions.

SECTION II

6. Clean the piping of all foreign material in clud ing

chips, welding scale, oil, grease and dirt before in-

stall ing the valve. Strain ers are rec om mended.

7. In placing thread sealant on pipe ends prior to

en gage ment, ensure that excess material is re-

moved and not allowed to enter the valve upon

startup.

8. Flow Direction: Install so the ﬂ ow direction match-

es the arrow cast on the body. The body has an

angle con ﬁ g u ra tion with a side inlet and bottom

outlet.

9. Regulator may be installed in a vertical or hor i -

zon tal pipe.

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 rec-

om mended that an inlet block valve, outlet block

valve, and a manual bypass valve be in stalled.

3. Pipe unions should be installed to allow removal

from piping.

4. An inlet pressure gauge should be lo cated ap-

proxi mately ten pipe diameters upstream and

within sight. An outlet pres sure gauge is op-

tional.

5. All installations should include an upstream relief

de vice if the inlet pressure could exceed the pres-

sure rating of any equipment or the maximum inlet

pressure rating of the unit.

Recommended Piping Schematic for

Back Pressure/Relief Station

INSTALLATION, OPERATION & MAIN TE NANCE MANUAL (IOM)

CAUTION

This is not a safety device and must not be substituted for a code approved pressure safety relief valve or a rupture disc.

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.

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.

1 2 3 4 5 6 7 8

Summary of Contents

Page 1 - MODEL 6987

II. INSTALLATIONIOM-698712-13MODEL 6987BACK PRESSURE / RELIEF REGULATORSECTION II. DESCRIPTION AND SCOPEThe Model 6987 is a back pressure relief reg

Page 2 - WARNING

IOM-69872SECTION IV10. Basic Regulator- (See Figure 1): Regulator may be rotated around the pipe axis 360°. Rec om -mend ed po si tions are with sprin

Page 3

IOM-69873A. General:1. Maintenance procedures hereinafter are based upon removal of the regulator unit from the pipe line where installed.2. Owner s

Page 4

IOM-698749. If available, collapse the piston spring (20) using the special tool from Figure 1. If no special tool is available, proceed to Step 10.

Page 5 - VII. TROUBLE SHOOTING GUIDE

IOM-69875SECTION VIIVII. TROUBLE SHOOTING GUIDEPossible Causes RemediesA. Oversized regulator. A1. A2.A3.A4.A5.Check actual ﬂ ow conditions, resize r

Page 6 - CAUTION

IOM-69876SECTION VIIINEW REPLACEMENT UNIT:Contact your local Cashco, Inc., Sales Rep re sen- ta tive with the Serial Number and Product code. With th

Page 7

IOM-69877Figure 2: Basic Model 6987 - Metal Seat Range Springs from 50 psig to 200 psig. ITEM REPAIR PARTS NO. DESCRIPTION Kit B 1 Body 2 S

Page 8

Cashco, Inc.P.O. Box 6 Ellsworth, KS 67439-0006PH (785) 472-4461Fax. # (785) 472-3539www.cashco.comemail: [email protected] in U.S.A. IOM-6987

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Cashco 6987 User Manual

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Summary of Contents

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