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cashco P7 Installation, Operation & Maintenance Manual

Piston sensing single stage pressure reducing regulator
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ISO Registered Company
I. DESCRIPTION AND SCOPE
The Model P7 is a 1/2" (DN15) or 3/4" (DN20) pressure reducing regulator used to control downstream (outlet or P
pressure. The unit is suitable for gaseous or liquid services. Refer to Technical Bulletin P7-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 in-
stalling the reg u la tor. Strainers are rec om mend ed.
7. In plac ing thread seal ant on pipe ends pri or to en-
INSTALLATION, OPERATION & MAINTENANCE MANUAL (IOM)
MODEL P7
PISTON SENSING SINGLE STAGE
PRESSURE REDUCING REGULATOR
CAUTION
SECTION I
SECTION II
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. Regulator may be rotated around the pipe axis 360°.
Recommended position is with spring loaded knob
(38) or loading dome (2) or ratio loading upper case
(44) in ver ti cal upwards position.
11. Regulators are not to be buried un der ground.
12. For insulated piping systems, recommendation is
to not insulate regulator.
Model P7
Recommended Piping Schematic
For Pressure Reducing Stations
IOM-P7
03/16
)
2

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Summary of Contents for cashco P7

  • Page 1 I. DESCRIPTION AND SCOPE The Model P7 is a 1/2" (DN15) or 3/4" (DN20) pressure reducing regulator used to control downstream (outlet or P pressure. The unit is suitable for gaseous or liquid services. Refer to Technical Bulletin P7-TB for design conditions and selection recommendations.

  • Page 2: Principle Of Operation

    Close the outlet (downstream) valve only observed and man u al ly reg u lat ed. Close the outlet (down stream) block valve. if reg u la tor re mov al is required. IOM-P7...

  • Page 3: Maintenance

    Assembly does not include pin (40), per off of range spring (28). B. 3, the poppet, (23) and poppet spring (22). per B.7 & B.8. The poppet seat (24) is replaced 3. Remove spring (28), pin (40) and spring follower by a solid disc. (26). IOM-P7...
  • Page 4 At re-assembly tighten vented screw (14) (4). into plug per following torque values: 5. With thumb, press down on top of piston (5) to For Cv Size Torque to in/oz. separate piston from sleeve (3). Remove and replace o-ring (6). IOM-P7...

  • Page 5: Troubleshooting Guide

    10. Inspect and replace any necessary parts. top works to a specific design. NOTE: Use only parts manufactured and sup- plied by Cashco, Inc. for these products. G. Diaphragm Replacement - Ratio Loaded Design: 11. Insert plug (12) and spring (15) into body (1).

  • Page 6: New Replacement Unit

    – NEW REPLACEMENT UNIT: PARTS "KIT" for FIELD REPAIR: Contact your local Cashco, Inc., Sales Rep re sen- Contact your local Cashco, Inc., Sales Rep re sen- ta tive with the Serial Number and Product code. ta tive with the Serial Number and Product code.
  • Page 7 Seat Orifi ce........++ Thrust Washer Plug..........++ Valve Seat Disc......++ Adjusting Screw Vent Screw(Valve Seat).....++ Adjusting Screw Spring Return Spring Vent Adjustment Screw Body Cap Retaining Ring (Snap Ring) O-Ring........++ Knob Backup Ring.......++ Knob Cover O-ring..........++ Retainer Spiral Retaining Ring....++ IOM-P7...
  • Page 8 Body Cap O-Ring.........++ Backup Ring........++ O-Ring.........++ Retainer Spirial Retaining Ring....++ O-Ring.........++ O-Ring.........++ FIGURE 2 DOME LOADED Repair Parts Item No. Description Kit B Post Lower Case Upper Case Diaphragm........++ Diaphragm Pressure Plate Cap Screw Cap Screws FIGURE 3 RATIO LOADED IOM-P7...
  • Page 9 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.

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