Instruction Manual

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Vent or

Reservoir

Bypass

Supply

@ P

SRV

Model 8311HP or 8311LP

Back Pressure/Relief

Regulator

System

Recommended Piping Schematic

for Models 8311HP/LP

INSTALLATION, OPERATION & MAINTENANCE MANUAL

IOM-8311HP/LP-BASIC

12-13

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 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 inlet pressure gauge should be located ap prox i mate ly

ten pipe diameters upstream, and within sight.

5. All installations should include a upstream re lief device

if the inlet pressure could exceed the pressure rating of

any upstream equipment or the maximum inlet pres sure

rating of the unit.

6. Clean the piping of all foreign material including chips,

welding scale, oil, grease and dirt before in stall ing the

regulator. Strainers are recommended.

l. DESCRIPTION AND SCOPE

The Model 8311 is a high capacity back pressure / relief regulator with double seat design used to control upstream (inlet or P

)

pressure. Sizes are 1-1/2" (DN40), 2" (DN50), 2-1/2" (DN65), 3" (DN80) and 4" (DN100). With proper trim utilization, the unit

is suitable for liquid, gas eous, or steam service. Refer to Tech ni cal Bulletin 8311-TB for design conditions and selection recom-

mendations.

This is not a safety device and must not be sub sti tut ed for a code

approved pressure safety relief valve or rupture disc.

SECTION II

II. INSTALLATION

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 regulator upon start-up.

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

arrow on the body. Install an external sensing line (1/2"

O.D. tubing min i mum) from the 3/8" NPT con nec tion

to a point up stream, pref er a bly at gauge location. If

regulator pipe line is ex pand ing to a larger pipe line,

always connect sensing line to the larger pipe line.

9. For best performance, install in well drained hor i zon tal

pipe, properly trapped, if a steam service ap pli ca tion.

MODELS 8311HP AND 8311LP

BACK PRESSURE / RELIEF REG U LA TORS

SECTION l

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.

WARNING

The maximum inlet pressure is equal to 1.3 times the

larger number of the stated range spring on the nameplate,

and is the recommended “upper op er a tive limit” for the

sensing diaphragm. Higher pres sures could damage the

diaphragm. (Field hy dro stat ic tests frequently destroy

diaphragms. DO NOT HYDROSTATIC TEST THRU AN

IN STALLED UNIT; ISOLATE FROM TEST.)

CAUTION

Summary of content (8 pages)

PAGE 1
INSTALLATION, OPERATION & MAINTENANCE MANUAL IOM-8311HP/LP-BASIC 12-13 MODELS 8311HP AND 8311LP BACK PRESSURE / RELIEF REGULATORS SECTION l l. DESCRIPTION AND SCOPE The Model 8311 is a high capacity back pressure / relief regulator with double seat design used to control upstream (inlet or P1) pressure. Sizes are 1-1/2" (DN40), 2" (DN50), 2-1/2" (DN65), 3" (DN80) and 4" (DN100). With proper trim utilization, the unit is suitable for liquid, gaseous, or steam service.
PAGE 2
10. Basic Regulator - (Refer to Figure 1): Regulator may be rotated around the pipe axis 360°. Recommended position is with spring chamber vertical upwards. Orient such that the spring chamber vent hole does not collect rainwater or debris. 11. Regulators are not to be direct buried underground. 12. For insulated piping systems, recommendation is to not insulate regulator. SECTION III III. PRINCIPLE OF OPERATION 1. Movement occurs as pressure variations register on the diaphragm.
PAGE 3
SECTION VI VI. MAINTENANCE remove pressure plate nut (24) by rotating CCW (viewed from above). WARNING SYSTEM UNDER PRESSURE. Prior to performing any maintenance, isolate the regulator from the system and relieve all pressure. Failure to do so could result in personal injury. A. B. NOTE: Do not rotate the plug and stem assembly (12). The plug (12.
PAGE 4
(29) and nuts (30) by hand tightening. Mechanically tighten bolting (29) (30) in a crossing pattern that allows spring chamber (13) to be pulled down evenly. Recommended torques are as follows: Model Diaphragm Material Torque Bolt Size 8311HP ALL 45 ft-lbs (61 N-M) 5/8" Ø 8311LP ALL 45 ft-lbs (61 N-M) 1/2" Ø NOTE: Never replace bolting (29) (30) with just any bolting, if lost. Bolt heads and nuts are marked with specification identification markings. Use only proper grades as replacements. 17.
PAGE 5
SECTION VII VII. TROUBLE SHOOTING GUIDE 1. Erratic operation; chattering. Remedies Possible Causes A. Oversized regulator; inadequate rangeability. A1. Check actual flow conditions, resize regulator for minimum and maximum flow. A2. Decrease regulator pressure drop; decrease inlet pressure by placing a throttling orifice in inlet piping union. A3. Install next step higher range spring. Contact factory. A4. Before replacing regulator, contact factory. B. Worn plug/stem assembly; inadequate guiding. B1.
PAGE 6
SECTION VIII VIII. 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 stamped on the metal name plate and attached to the unit. This information can also be found on the Bill of Material ("BOM"), a parts list that was provided when unit was originally shipped. (Serial Number typically 6 digits).
PAGE 7
Item No. 1 2 3 4 5 6 7 8 10 11 12 13 14 15 16 17 18 19 20 21 22 24 25 27 28 29 30 31 32 33 34 35 36 43 54 55 Description Body Bonnet Bottom Flange Guide Bushing Stem Bushing Body Gasket Body Stud Body Stud Nut Upper Seat Ring Lower Seat Ring Valve Plug Assembly 12.1 Plug 12.2 Stem 12.
PAGE 8
Cashco, Inc. P.O. Box 6 Ellsworth, KS 67439-0006 PH (785) 472-4461 Fax. # (785) 472-3539 www.cashco.com email: sales@cashco.com Printed in U.S.A. IOM-8311HP/LP Cashco GmbH Handwerkerstrasse 15 15366 Hoppegarten, Germany PH +49 3342 4243135 Fax. No. +49 3342 4243136 www.cashco.com Email: germany@cashco.com Cashco do Brasil, Ltda. Al.Venus, 340 Indaiatuba - Sao Paulo, Brazil PH +55 11 99677 7177 Fax. No. www.cashco.com Email: brazil@cashco.