Cashco 31-N User Manual download pdf

IOM-31-N

05-14

MODEL 31-N

Pressure 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

shut down is not readily accomplished, it is

rec om mend ed that an outlet block valve and a

manual bypass valve be installed.

3. Pipe unions are recommended to be installed to

allow removal from piping. Trim can be changed

without removal from pipeline.

4. An outlet pressure gauge should be located

ap prox i mate ly 10 pipe diameters downstream,

and within sight.

5. All installations should include a downstream

re lief device if the inlet pressure could exceed the

pressure rating of any downstream equipment.

A downstream safety relief valve or a rupture

disc is absolutely required if the inlet P

pres sure exceeds 100 psig (6.9 Barg) under

any normal 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 P

) pressure to levels

between 2" – 16 “WC (50–400 mm H

O). Sizes are 1/2" 3/4”, 1", 1-1/2" and 2" (DN15, 20, 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 mech a nism. Overpressure protection requires use of a downstream

safety 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.

User to comply with instructions, operating re quire ments and maintenance requirements located herein the “IOM-31-N”.

WARNING

The maximum outlet pressure listed on the name plate is

the “upper operative limit” for the sensing di a phragm.

Higher pressures could damage the internals. (Field hy-

dro stat ic or pneumatic pressure tests fre quent ly destroy

diaphragms. DO NOT HY DRO STAT IC OR PNEUMATIC

PRESSURE TEST THRU AN IN STALLED UNIT EX POS ING

THE OUTLET POR TION OF THE REGULATOR TO PRES-

SURES GREATER THAN 50 PSIG (3.45 BARG) FAIL URE

TO HEED MAY RESULT IN CAT A STROPH IC FAIL URE WITH

FLYING PARTS AND POSSIBILITY OF PER SON AL INJURY!

ISO LATE FROM TEST.)

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 ... 11 12

Summary of Contents

Page 1 - MODEL 31-N

IOM-31-N05-14MODEL 31-NPressure Reducing Service RegulatorSECTION III. INSTALLATION1. An inlet block valve should always be installed. An outlet bloc

Page 2 - III. PRINCIPLE OF OPERATION

IOM-31-N10Figure 61-1/2" & 2" Body SizesFigure 7 Partial Section:Body Assembly (BA)-to-Actuator Assembly(AA) Con nec tionNEW REPLACEMENT

Page 3 - SECTION IV

IOM-31-N11Figure 8Partial Plan: Linkage Lever (21) PedestalsLinkage Lever (21) mounts be-tween pedestals; not shown for clarity.ItemNo. Description 1

Page 4 - VI. MAINTENANCE

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

Page 5

IOM-31-N27. In placing thread sealant on pipe ends prior to en gage ment, assure that excess material is re moved and not allowed to enter the regula

Page 6

IOM-31-N33. Model 31-N includes a linkage lever in its mech a- nism. The linkage lever allows the regulator to operate ﬂ ow-to-open (FTO) and provid

Page 7

IOM-31-N41 Product of Fisher Scientiﬁ c CompanySECTION VIVI. MAINTENANCEA. General:1. Maintenance procedures hereinafter are based upon removal of th

Page 8 - VIII. TROUBLE SHOOTING GUIDE

IOM-31-N510. While holding upper diaphragm plate (13) by palm of hand, hand-pull diaphragm (12) away from upper di a phragm plate (13). NOTE: The dia

Page 9

IOM-31-N621. In an alternating cross-pattern, tighten screws (9) in one revolution increments. Repeatpattern until torque reaches 25–30 in-# (2.8–3.4

Page 10 - SECTION IX

IOM-31-N7BODY SIZES 1/2', 3/4" & 1" (DN15, 20 & 25)BODY SIZES 1-1/2" & 2" (DN40 & 50)Figure 42. Remove lower

Page 11 - Internal Sensing Option

IOM-31-N8SECTION VIIVII. SETPOINT ADJUSTMENT/CAL I BRA TION1. Establish ﬂ ow thru the regulator, preferably a relatively low ﬂ ow rate, approximately

Page 12

IOM-31-N9Possible Cause RemedyA. Diaphragm failure. A. Replace diaphragm.B. Downstream over-pressurization. B1.B2.B3.B4.B5.Correct process conditions/

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