Cashco DA5 User Manual download pdf

INSTALLATION, OPERATION & MAINTENANCE MANUAL (IOM)

IOM-DA5

11/13

I. DESCRIPTION AND SCOPE

The Model DA5 is a spring operated back pressure regulator used to control upstream (inlet or P1) pressure. Sizes

are 1/2" (DN15), 3/4" (DN20), 1" (DN25), 1 1/4" (DN32), 1 1/2" (DN40), 2" (DN50), 2 1/2" (DN65), 3" (DN80) and

4" (DN100). With proper trim uti li za tion, the unit is suitable for liquid, gaseous, or steam service. The Model DA5

is available in a more common “reverse” ﬂ ow direction arrangement, that is balanced against outlet pressure varia-

tions, and a “standard” ﬂ ow direction arrangement that is unbalanced. Refer to Technical Bulletin DA5-TB for design

conditions and selection rec om men da tions. (NOTE: This product was formerly iden ti ﬁ ed as a Model D5 or Type V;

a Model DA5, D5 and Type V are one and the same product.)

MODEL DA5

DA5 - DIRECT-ACTING, SPRING LOADED

BACK PRESSURE REGULATOR

SECTION I

II. REFERENCES

Refer to Technical Bulletin DA5-TB and DAG-TB for

tech ni cal speciﬁ cations of a Model DA5 regulator.

ABBREVIATIONS

CCW – Counter Clockwise

CW – Clockwise

ITA – Inner Trim Assembly

III. INSTALLATION

4. Install block valves and pressure gauges to pro-

vide means for adjustment, operation, bypass,

or removal of the regulator. A pipeline strainer is

recommended upstream of inlet port to remove

typical pipe line debris from entering valve and

damaging internal “soft goods”, primarily the dy-

namic side seal and V-TFE seat when applied.

5. Upstream Sensing Installation Considerations

– Internal or External Sensing:

a. The regulator may be installed with internal

or external sensing. Unless otherwise spec-

i ﬁ ed, the regulator is supplied by the factory

with internal sensing. The regulator may be

con vert ed in the ﬁ eld to external sensing. (See

Section VII maintenance, Part H – Converting

Internal/External Sensing.

b. Reference DAG-TB, Table DAG-12 for rec-

om men da tions for applying external pressure

sensing.

c. For internal sensing, no external line is re-

quired. For external sensing, use an external

control line. The line is connected from the

port 1/4" (DN8) NPT on the side of the body

di a phragm ﬂ ange (see following schematic)

to a pressure tap upstream of the regulator.

SECTION III

SECTION II

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. Install per direction of ﬂ ow arrow indicated on body,

or "IN" and "OUT" markings.

2. Regulator may be rotated around pipe axis 360

degrees. For ease of maintenance, the rec om -

mend ed position is with the spring chamber (4)

upwards. In liquid service it is recommended that

the spring cham ber be oriented down wards, and

that a cus tom er supplied and installed vent valve

be pro vid ed at the external sensing connection

to bleed-off trapped gas/air under the diaphragm

during initial startup.

3. Provide space below, above, and around reg u la tor

for removal of parts during maintenance.

1 2 3 4 5 6 ... 15 16

Summary of Contents

Page 1 - MODEL DA5

INSTALLATION, OPERATION & MAINTENANCE MANUAL (IOM) IOM-DA511/13I. DESCRIPTION AND SCOPEThe Model DA5 is a spring operated back pressure regul

Page 2 - CAUTION

IOM-DA510of range spring is less than 55 psig, use test pressure of 5 psig less than upper value of range spring. If upper value of range spring is gr

Page 3 - SECTION VI

IOM-DA5 113. Upstream pressure too high.Possible Causes RemediesA. Debris in trim preventing movement. A. Clean unit of debris.B. Undersized regulato

Page 4 - (FTC Flow Direction Only)

IOM-DA512SECTION IXNEW REPLACEMENT UNIT:Contact your local Cashco, Inc., Sales Rep re sen- ta tive with the Serial Number and Product code. With this

Page 5 - WARNING

IOM-DA5 13 Item No. Description 1 Adjusting Screw 2 Adjusting Screw Lock Nut 4 Spring Chamber 5 Spring Follower (Button) 6 Range Spring

Page 6

IOM-DA514 Item No. Description 1 Adjusting Screw 2 Adjusting Screw Lock Nut 4 Spring Chamber 5 Spring Follower (Button) 6 Range Spring

Page 7

IOM-DA5 15The contents of this publication are presented for informational purposes only, and while every effort has been made to ensure their accurac

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. DA5-IOMC

Page 9

IOM-DA52A tubing outside diameter of 0.25 inch is adequate for short sensing lines (less than 4 feet). Use 3/8" tubing or 1/4" schedule 40

Page 10 - SECTION VIII

IOM-DA5 39. Reduce system ﬂ ow to a minimum level and ob-serve pressure set point. Inlet pressure will de-crease from the set point of Step 8. The m

Page 11

IOM-DA54Figure 1: Dynamic Side Seals(FTC Flow Direction Only)

Page 12 - CAUTION

IOM-DA5 5B. Main Valve Disassembly:1. Shut down the system in accordance with Section VI. 2. Disconnect the external sensing line, if in- stalled.3

Page 13 - FTO – Flow To Open

IOM-DA56Re move di a phragm lock nut (7) after fully loosened and socket wrench is removed.c. Remove upper diaphragm pressure plate (8).d. Remove di

Page 14

IOM-DA5 7vise and rotate end-for-end and resecure in vise using same metal bars.5. Body Sizes 2-1/2" thru 4":a. Orient plug (20) with thre

Page 15 - IOM-DA5 15

IOM-DA58be on upper side, “ﬂ at” side down wards. For metal diaphragm construction the “rounded” surface of the lower diaphragm push er plate (10) sho

Page 16

IOM-DA5 9circumferentially press the ﬁ rst (low er) piston ring seal (27.5) inwards into the valve plug (20) groove until the ﬁ rst piston ring seal