Cashco 31-B User Manual download pdf

IOM-31-B

05-14

MODEL 31-B

Back Pressure Relief Service Regulator

SECTION I

II. INSTALLATION

1. An inlet block valve should always be installed.

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. Refer to Figure 1.

3. Pipe unions are recommended to be installed to

allow removal of this unit from piping. Trim can

be changed without removal from pipeline.

4. An inlet pressure gauge should be located ap-

prox i mate ly ten pipe diameters upstream, and

within sight.

5. All installations should include an upstream

re lief device if the inlet pressure could exceed

the pressure rating of any equipment or the

maximum inlet pressure rating of the unit.

SECTION II

I. DESCRIPTION AND SCOPE

The Model 31-B is a back pressure relief service regulator used to control upstream (inlet 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-B-TB for sizing, application and selection recommendations.

INSTALLATION, OPERATION & MAINTENANCE MANUAL (IOM)

CAUTION

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

disc.

2. IF GAS IS DETECTED BY SMELL, CONTACT YOUR GAS COMPANY IMMEDIATELY.

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

CAUTION

Installation of adequate overpressure pro tec tion is rec-

ommended to pro tect the reg u la tor from overpressure

and all up 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.

6. Clean the piping of all foreign material including

chips, welding scale, oil, grease and dirt before

in stall ing the regulator. Strainers are rec om-

mend ed.

7. 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 regulator

upon startup.

8. Flow Direction: Install so the ﬂ ow direction

match es the arrow cast on the regulator body.

9. Regulator may be rotated around pipe axis 360°,

and may be installed in a horizontal or vertical

pipeline. Two orientation/arrangement assembly

positions are standard. Orient to prevent the

upper case vent hole from collecting rainwater

or debris. Reorient ac tu a tor around the stem

axis 360° if nec es sary. Refer to Figure 2.

1 2 3 4 5 6 ... 11 12

Summary of Contents

Page 1 - MODEL 31-B

IOM-31-B05-14MODEL 31-BBack Pressure Relief Service RegulatorSECTION III. INSTALLATION1. An inlet block valve should always be installed.2. If servi

Page 2 - III. PRINCIPLE OF OPERATION

IOM-31-B10Figure 61-1/2" & 2" Body SizesFigure 7 Partial Section:Body Assembly (BA)-to-Upper Assembly(UA) Con nec tionNEW REPLACEMENT UN

Page 3 - SECTION IV

IOM-31-B11Figure 51/2" - 1' Body SizesFigure 8Top View of Pedestal in Lower CaseLinkage Lever (21) mounts between two spacers (39) that are

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. 31-

Page 5

IOM-31-B210. Regulators are not to be direct buried un der- ground.11. For insulated piping systems, recommendation is to not insulate regulator.12.

Page 6

IOM-31-B3SECTION IVIV. STARTUP1. Assure that the proper range spring is indicated to be within the regulator by inspection of the unit’s name plate.

Page 7

IOM-31-B4SECTION VIVI. MAINTENANCEA. General:1. Maintenance procedures hereinafter are based upon removal of the regulator unit from the pipeline whe

Page 8

IOM-31-B5upper di a phragm plate (13) with adhesive. Rotate the upper plate and repeat this action until the diaphragm (12) is fully re moved. Discard

Page 9 - VII. TROUBLE SHOOTING GUIDE

IOM-31-B621. 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 VIII

IOM-31-B7BODY SIZES 1/2", 3/4" & 1" (DN15, 20 & 25)BODY SIZES 1-1/2" & 2" (DN40 & 50)Figure 4snuggly”. Re pe

Page 11 - Internal Sensing Option

IOM-31-B82. Rotate adjustment screw (18) CCW to re- mov al.3. Remove existing range spring (17).4. Install new range spring (17) (refer to Table 2)

Page 12

IOM-31-B9SECTION VIIPossible Cause RemedyA. Diaphragm failure. A. Replace diaphragm.B.Body gasket failure.B1. Replace body gasket.VII. TROUBLE SHOOTI

Comments to this Manuals

No comments

Cashco 31-B User Manual

Browse online or download User Manual for Sensors Cashco 31-B. Cashco 31-B User Manual

Summary of Contents

Comments to this Manuals

Related products and manuals for Sensors Cashco 31-B