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PRESSURE REDUCING REGULATORS
I. DESCRIPTION AND SCOPE
The Model D is a pressure reducing regulator used to control downstream (outlet or P
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
recommendations.
II. INSTALLATION
For welded installations, all internal trim parts, seals
and diaphragm(s) must be removed from regulator
body prior to welding into pipeline. 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.
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.
Installation of adequate overpressure pro tec tion
is recommended to pro tect the reg u la tor from
overpressure and all down stream equip ment from
damage in the event of regulator failure.
INSTALLATION, OPERATION & MAINTENANCE MANUAL (IOM)
MODELS D and DL
CAUTION
CAUTION
SECTION I
SECTION II
Supply
@ P1
Blowdown-Drain
(Shaded portion for steam/condensate systems)
Recommended Piping Schematic
6.
Clean the piping of all foreign material in clud ing
chips, welding scale, oil, grease and dirt be fore
installing 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 flow 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
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.
) pressure. Sizes are 3/8" (DN10),
2
Model D or DL
Reducing
Regulator
For Pressure Reducing Station
IOM-D/DL
12-16
Outlet
@ P2
SRV
Bypass
Blowdown-Drain
. Rec-
o
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Table of Contents
Related Manuals for cashco D
Summary of Contents for cashco D
- Page 1 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 recommendations.
-
Page 2: Principle Of Operation
Inlet and Outlet pres sure and tem pera ture ratings are at dif fer ent levels. 13. Spring Chamber Vent Tap - Option D-25 or DL- 25: Pipe spring chamber vent opening to remote 10.B. Model D Cryogenic Regulator - Option D-5 or D-36 lo ca tion. -
Page 3: Maintenance
Phar ma ceu ti cal and Food ap pli ca tions” Op tion in flying parts that could cause personal injury. D-37 or D-37S, main te nance must in clude a level of cleanliness equal to Cashco cleaning Securely install the body (1) in a vise with stan dard #S-1576. - Page 4 (14); ensure spring button (4) NOTE: On regulators originally supplied as is laying flat. “oxygen clean”, Option D-5 , D-36, D-55, or DL-55, maintenance must include a level 11. Aligning the matchmarks, place spring cham ber of clean li ness equal to Cashco cleaning (2) over the above stacked parts.
-
Page 5: Troubleshooting Guide
(14) with a 100 psig (6.9 Barg) minimum. NOTE: When piston (15) assemblies are used with comp seats, Cashco, Inc. does not rec om mend attempting to remove the comp seat. If composition seat is dam aged, re place entire pis ton assembly. -
Page 6: Section Viii
Cashco, Inc. does not assume responsibility for the selection, use or maintenance of any product. Responsibility for proper selection, use and maintenance of any Cashco, Inc. product remains solely with the purchaser. - Page 7 Not Shown: Gauge Bushing NOT included in kits - must order additionally. NOTE: Mount in horizontal line with adjusting screw down (as shown). Figure 4: Option D-5 or D-36 Cryogenic Model D Metal Diaphragm Figure 5: Option-20 - Pressure Loaded IOM-D/DL...
- Page 8 (See items 45 and 64 in Tables). The pressure gauges offered as options on a few of the regulator models (DA’s, P1-7, D, 764, 521), use a plastic polycarbonate window that is a potential ignition source due to static electricity. To demonstrate that the gauges are...
- Page 9 If the above issues are addressed by selecting options that do not have potential sources of ignition, avoiding options that have not been assessed, and by taking the proper usage issue precautions, then Cashco regulators can be considered to be a mechanical device that does not have its own source of ignition and thus falls outside the scope of the ATEX directive.
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