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BALANCED PRESSURE REDUCING REGULATOR
I. DESCRIPTION AND SCOPE
The Model P4 is a high flow single stage pressure reducing regulator used to control downstream (outlet or P
pressure. Sizes are 3/8" and 1/2" (DN10 and DN15) FNPT or 1/2" (DN15) with Tri-Clamp connections. The unit is
suitable for gaseous service. Refer to Technical Bulletin P4-TB for design conditions and selection recommendations.
II. INSTALLATION
Installation of adequate overpressure pro tec tion
is recommended to pro tect the reg u la tor from
over pres sure and all down stream equip ment from
dam age in the event of regulator failure.
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-
ommended that an inlet block valve, outlet block
valve, and a manual bypass valve be installed.
3. Pipe unions should be installed to allow removal
from piping.
4. An outlet pressure gauge should be located ap-
proxi mately ten pipe diameters downstream, and
within sight.
5. All installations should include a downstream re-
lief de vice if the inlet pressure could exceed the
pres sure rating of any downstream equip ment or
the maximum outlet pressure rating of the unit.
6. Clean the pip ing of all foreign material including
chips, welding scale, oil, grease and dirt before
installing the reg u la tor.
mend ed.
INSTALLATION, OPERATION & MAINTENANCE MANUAL (IOM)
MODEL P4
CAUTION
Strainers are rec om-
SECTION I
SECTION II
Supply
@P
1
Blowdown-Drain
7. In plac ing thread seal ant on pipe ends pri or to
en gage ment, ensure that excess material is
re moved and not allowed to enter the regulator
upon startup.
8. Flow Direction: Install so the flow direction match-
es the inlet stamp on the main regulator body (1).
9. For best performance, install in well drained hori-
zon tal pipe.
10. Basic Regulator - (Refer to Figure 2): Regula-
tor may be rotated around the pipe axis 360°.
Recommended position is with knob (4) ver ti cal
upwards.
11. Regulators are not to be buried un der ground.
12. For insulated piping systems, recommendation is
to not insulate regulator.
Model P4
Reducing
Regulator
Recommended Piping Schematic
For Pressure Reducing Station
IOM-P4
01-17
)
2
Outlet
@P
2
SRV
P
1
Bypass
Blowdown-Drain
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Summary of Contents for cashco P4
- Page 1 I. DESCRIPTION AND SCOPE The Model P4 is a high flow single stage pressure reducing regulator used to control downstream (outlet or P pressure. Sizes are 3/8" and 1/2" (DN10 and DN15) FNPT or 1/2" (DN15) with Tri-Clamp connections. The unit is suitable for gaseous service.
-
Page 2: Principle Of Operation
Close the outlet (downstream) valve only observed and man u al ly reg u lat ed. Close the if reg u la tor re mov al is required. outlet (down stream) block valve. IOM-P4... -
Page 3: Maintenance
1. Securely install the body (1) in a vise with NOTE: Use only parts man u fac tured and knob (4) directed upwards. sup plied by Cashco, Inc. for these products. See Section VIII. WARNING 8. Reassemble di a phragm subassembly (7) by plac ing the actuator gasket (7.4), di a phragm... - Page 4 (6) to test for leakage. En sure that an outlet necessary. NOTE: Use only parts man u fac- pressure is main tained during this leak test tured and supplied by Cashco, Inc. for these of at least mid-range spring level; i.e. 2-100 products. See Section VIII.
-
Page 5: Troubleshooting Guide
Check system; isolate (block) fl ow at regulator inlet - not outlet. Relocate regulator if necessary. No pressure relief protection. Install safety relief valve, or rupture disc. Restricted diaphragm movement. Ensure no moisture in spring chamber at temperatures below freeze point. IOM-P4... -
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. - Page 7 Actuator O-ring ------------------‡‡ Poppet --------------------------------- ‡‡ Poppet Spring ----------------------- ‡‡ Diaphragm Gasket ----------------- ‡‡ O-ring ----------------------------------‡‡ Seat ------------------------------------ ‡‡ Seat Retainer ------------------------ ‡‡ Range Spring Spring Clip Back-up Ring-------------------------‡‡ Inline Filter ---------------------------- ‡‡ Snap in cover ‡‡ Recommended Spare Part IOM-P4...
- Page 8 ATEX Essential Health and Safety Requirements, are listed below. The plastic knob used as standard on some models, (P1, P2, P3, P4, P5, P7, 3381, 4381, 1171, and 2171) is a potential ignition source due to static electricity. To demonstrate otherwise, the knob must be tested to determine if a transferred charge is below the acceptable values in IEC 60079-0 Section 26.14 (See items 25, 27, and 28 in...
- 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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