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INSTALLATION, OPERATION & MAINTENANCE MANUAL (IOM)

IOM-D/DL

12-13

MODELS D and DL

PRESSURE REDUCING REGULATORS

SECTION I

I. DESCRIPTION AND SCOPE

The Model D is a pressure reducing regulator used to control downstream (outlet or P

) pressure. Sizes are 3/8" (DN10),

1/2" (DN15), 3/4" (DN20) and 1" (DN25). With proper trim utilization, the unit is suit able for liquid, gase ous, or steam

serv ice. Refer to Technical Bulletin D-TB for design conditions and se lec tion recommendations.

The Model DL is also a pressure reducing regulator similar to above Model D. Sizes are 1-1/2" (DN40) and 2" (DN50).

(Model DL was formerly a Cashco Model D). Refer to Technical Bulletin DL-TB for design conditions and selection recom-

mendations.

SECTION II

II. INSTALLATION

1. An inlet block valve should always be in stalled.

2. If service application is continuous such that shut-

down is not readily accomplished, it is rec ommended

that an inlet block valve, outlet block valve, and a

manual bypass valve be installed.

3. Pipe unions should be installed to allow re moval

from piping.

4. An outlet pressure gauge should be located ap prox i-

mate ly ten pipe diameters downstream and within

sight.

5. All installations should include a downstream re lief

device if the inlet pressure could exceed the pres-

sure rating of any downstream equip ment or the

maximum outlet pressure rating of the unit.

Recommended Piping Schematic

For Pressure Reducing Station

6. Clean the piping of all foreign material in clud ing

chips, welding scale, oil, grease and dirt be fore in-

stalling the regulator. Strainers are rec om mend ed.

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 regu la tor upon

startup.

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

the arrow cast on the body.

9. For best performance, install in well drained hori-

zon tal pipe, properly trapped, if a steam service

application.

10.A. Basic Regulator - (Refer to Figure 2): Regu la tor

may be rotated around the pipe axis 360

. Rec-

om mended position is with spring cham ber ver ti cal

upwards. Ori ent such that the spring cham ber vent

hole does not collect rainwater or debris.

CAUTION

For welded installations, all internal trim parts, seals

and diaphragm(s) must be removed from regula-

tor body prior to welding into pipelne. The heat

of fusion welding will damage non-metallic parts if

not removed. NOTE: This does not apply to units

equipped with extended pipe nipples.

CAUTION

Installation of adequate overpressure pro tec tion is

recommended to pro tect the reg u la tor from overpres-

sure and all down stream equip ment from damage

in the event of regulator failure.

Supply

@ P1

Outlet

@ P2

SRV

Model D or DL

Reducing

Regulator

Bypass

Blowdown-Drain Blowdown-Drain

(Shaded portion for steam/condensate systems)

Summary of content (8 pages)

PAGE 1
IOM-D/DL 12-13 INSTALLATION, OPERATION & MAINTENANCE MANUAL (IOM) MODELS D and DL PRESSURE REDUCING REGULATORS SECTION I I. DESCRIPTION AND SCOPE The Model D is a pressure reducing regulator used to control downstream (outlet or P2) pressure. Sizes are 3/8" (DN10), 1/2" (DN15), 3/4" (DN20) and 1" (DN25). With proper trim utilization, the unit is suitable for liquid, gaseous, or steam service. Refer to Technical Bulletin D-TB for design conditions and selection recommendations.
PAGE 2
CAUTION DO NOT HYDROSTATIC TEST THRU AN INSTALLED UNIT; ISOLATE REGULATOR FROM TEST. The upper range spring pressure level listed on the nameplate or 100 psig (6.9 Barg) minimum is the recommended “upper operative limit” for the sensing diaphragm (see Section IV. Startup, Number 7.) Higher pressures could cause internal damage. In addition, note on the nameplate that the Inlet and Outlet pressure and temperature ratings are at different levels. 10.B.
PAGE 3
SECTION V V. SHUTDOWN 1. CAUTION On systems with a bypass valve, and where system pressure is to be maintained as the regulator is shut down, slowly open the bypass valve while reducing the loading pressure (Opt.-20) and slowly closing the inlet (upstream) block valve. When all loading pressure is relieved, fully close the inlet (upstream) block valve. (When on bypass, the system pressure must be constantly observed and manually regulated.) Close the outlet (downstream) block valve.
PAGE 4
10. Place multi-purpose, high temperature grease into depression of spring button (4) where adjusting screw bears. Set spring button (4) onto range spring (14); ensure spring button (4) is laying flat. 6. NOTE: On regulators originally supplied as “oxygen clean”, Option D-5 , D-36, D-55, or DL-55, maintenance must include a level of cleanliness equal to Cashco cleaning standard #S-1134.
PAGE 5
15. Spray liquid leak detector around body cap (5) and body (1) for test for leakage. Test pressure should be a minimum of 100 psig (6.9 Barg) at the inlet. Outlet should be tested to upper value of range spring (14) with a 100 psig (6.9 Barg) minimum. NOTE: When piston (15) assemblies are used with comp seats, Cashco, Inc. does not recommend attempting to remove the comp seat. If composition seat is damaged, replace entire piston assembly. SECTION VII VII. TROUBLE SHOOTING GUIDE 1.
PAGE 6
4. Excessive pressure downstream. Possible Causes Remedies A. Regulator not closing tightly. A. Inspect the seating. Clean and lap metal seat surfaces; replace if lapping does not remedy. If composition seats are depressed, nicked or embedded with debris, replace trim. B. Downstream block. B. Check system; isolate (block) flow at regulator inlet - not outlet. Relocate regulator if necessary.. C. No pressure relief protection. C. Install safety relief valve, or rupture disc. D.
PAGE 7
Figure 1: Option D-3 or DL-3 Handwheel and Locking Lever Figure 2: Basic Model D - Comp Diaphragm Repair Parts Figure 3: Option-4 - Stabilizer NOTE: Mount in horizontal line with adjusting screw down (as shown). Item No.
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. D/DL-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.