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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.

Summary of content (16 pages)

PAGE 1
INSTALLATION, OPERATION & MAINTENANCE MANUAL (IOM) IOM-DA5 11/13 MODEL DA5 DA5 - DIRECT-ACTING, SPRING LOADED BACK PRESSURE REGULATOR SECTION I 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 utilization, the unit is suitable for liquid, gaseous, or steam service.
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A 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 pipe for sensing lines of 5 to 50 feet. d. For condensable vapors (i.e. steam) slope the external sensing line downward 2 to 5 degrees to inlet piping to prevent water pockets, which allows the diaphragm chamber to always be self draining. The external sensing line may be sloped upward for gas or liquid service; i.e. non-condensibles.
PAGE 3
9. Reduce system flow to a minimum level and observe pressure set point. Inlet pressure will decrease from the set point of Step 8. The maximum build in inlet pressure on increasing flow should not exceed the stated upper limit of the range spring by greater than 30%. If it does, consult factory. SECTION VI VI. SHUTDOWN 3. Shutoff the outlet block valve. 4. Relieve the trapped upstream and downstream pressure. 1. Shutoff inlet block valve. 2.
PAGE 4
(FTC Flow Direction Only) Figure 1: Dynamic Side Seals 4 IOM-DA5
PAGE 5
B. Main Valve Disassembly: 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.* * Includes external sensing connection if applicable. 1. Shut down the system in accordance with Section VI. 2. Disconnect the external sensing line, if installed. 3.
PAGE 6
c. d. e. f. g. h. i. j. Remove diaphragm locknut (7) after fully loosened and socket wrench is removed. Remove upper diaphragm pressure plate (8). Remove diaphragm(s) (9, 9.1, 9.2, 9.9). Examine diaphragm(s) to determine whether failed; determine if operating conditions are exceeding pressure drop or temperature limits. Remove upper stem seal (14.1). Remove lower diaphragm pusher plate (10). Remove middle stem seal (14.2). Remove piston/guide bearing (13) with dynamic side seal (27) in place.
PAGE 7
(20). Repeat this procedure with a second piston ring seal (27.5). Orient/ rotate the "splits" in piston ring seals (27.5) 180° across from each other. vise 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 threaded end upwards, place into a vise, grasping the seat disc nut (30); tighten the vise lightly, only enough to "hold" the plug (20) from rotating out of the vise.
PAGE 8
be on upper side, “flat” side downwards. For metal diaphragm construction the “rounded” surface of the lower diaphragm pusher plate (10) should be on upper side, “flat” side downwards. 11. For composition diaphragm construction, place new o-ring upper stem seal (14.1) on/over upper end of valve plug (20) and into groove of lower diaphragm pusher plate (10). 12. For metal diaphragm construction, place compatible gasket sealant on both sides and place new lower pusher plate gasket (14.
PAGE 9
circumferentially press the first (lower) piston ring seal (27.5) inwards into the valve plug (20) groove until the first piston ring seal (27.5) “slips into” the cage (19). Repeat for the second piston ring seal (27.5) c. Type UC: Position the ITA's valve plug (20) lower end over and into upper end of cage (19) until the cap seal (27.1) edge touches the upper lip of the cage (19).
PAGE 10
of 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 greater than 55 psig, use test pressure of 50 psig. b. While applying GN2 or air pressurization fluid, turn adjusting screw CCW until valve appears to be closed. Add one additional revolution CCW to adjusting screw. c. Tube outlet to a beaker of water to observe number of escaping gas bubbles. or GN2, whichever is higher. b.
PAGE 11
3. Upstream pressure too high. Possible Causes Remedies A. Debris in trim preventing movement. A. Clean unit of debris. B. Undersized regulator. B. Check actual flow conditions; resize regulator for minimum and maximum flow; if necessary, replace with larger regulator. 4. Diaphragm continually breaks (steam service regulators). Possible Causes Remedies A. Stem seals, which protect fluorocarbon elastomer in A. diaphragm assembly, may have deteriorated. Replace with new seals. B.
PAGE 12
SECTION IX IX. 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 13
Figure 3 Metal Diaphragm FTO – Flow To Open Item No. 1 2 4 5 6 7 8 9 9.1 9.2 10 11 12 * 14 14.2 14.4 IOM-DA5 Description Adjusting Screw Adjusting Screw Lock Nut Spring Chamber Spring Follower (Button) Range Spring Diaphragm Lock Nut Upper Diaphragm Pressure Plate Diaphragm Diaphragm (Material #1) Diaphragm (Material #2) Lower Diaphragm Pusher Plate Flange Bolts Flange Bolting Nuts Stem Seal Middle Stem Seal Lower Pusher Plate Gasket Item No.
PAGE 14
Figure 4 Composition Diaphragm FTO – Flow to Open Reverse Flow Direction (Most Common) Item No. 1 2 4 5 6 7 8 9 9.1 9.2 9.9 10 11 12 * 14 14.1 14.
PAGE 15
The contents of this publication are presented for informational purposes only, and while every effort has been made to ensure their accuracy, they are not to be construed as warranties or guarantees, express or implied, regarding the products or services described herein or their use or applicability. We reserve the right to modify or improve the designs or specifications of such product at any time without notice. Cashco, Inc.
PAGE 16
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. DA5-IOM 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.