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cashco 1164 Installation, Operation & Maintenance Manual

Back pressure / relief regulator
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ISO Registered Company
BACK PRESSURE / RELIEF REGULATOR
I. DESCRIPTION AND SCOPE
The Model 1164 is a modulating back pressure relief regulator used to control upstream (inlet) pressure. Sizes are
3/4", 1", 1-1/2" and 2" (DN 20, 25, 40 and 50) for side (inlet, flow-through,) and bottom (discharge) connections.
With proper trim utilization the unit is suitable for liquid, gaseous, or steam service. Refer to Technical Bulletin
1164-TB for design conditions and selection rec om men da tions.
This is not a safety device and must not be substituted for a code approved pressure safety relief valve or a rupture disc.
II. INSTALLATION
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 om mend ed 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 inlet pressure gauge should be located
ap prox i mate ly ten pipe diameters upstream and
within sight. An outlet pressure gauge is optional.
5. All installations should include an upstream relief
device if the inlet pressure could exceed the
pressure rating of any equipment or the maximum
inlet pressure rating of the unit.
The maximum inlet pressure is equal to 1.5 times
the larger number of the stated range spring on the
name plate, and is the rec om mend ed "upper op er a tive
limit" for the sens ing diaphragm. Higher press ures could
dam age the di a phragm. (Field hydro static tests fre quent ly
de stroy dia phragms. DO NOT HYDRO STATIC TEST THRU
AN IN STALLED UNIT; ISO LATE FROM TEST.)
6. Clean the piping of all foreign material including
chips, welding scale, oil, grease and dirt
before installing the regulator. Strainers are
rec om mend ed.
INSTALLATION, OPERATION & MAINTENANCE MANUAL (IOM)
MODEL 1164
WARNING
SECTION I
CAUTION
SECTION II
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 regulator
upon startup.
8. Flow Direction: Install so the flow direction match es
the arrow cast on the body. Connect the inlet
pressure to the body side connection(s). Fluid will
relieve out of the bottom connection. The double
inlet con nec tions are for in-line in stal la tion (plug
one side connection if in-line in stal la tion is not
required).
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.
IOM-1164
CAUTION
11-16

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Summary of Contents for cashco 1164

  • Page 1 I. DESCRIPTION AND SCOPE The Model 1164 is a modulating back pressure relief regulator used to control upstream (inlet) pressure. Sizes are 3/4", 1", 1-1/2" and 2" (DN 20, 25, 40 and 50) for side (inlet, flow-through,) and bottom (discharge) connections.

  • Page 2: Principle Of Operation

    9. Regulator may be installed in a vertical or hor i zon tal 13. Spring Chamber Vent Tap - Option 1164-25: 1/4" pipe. If it is a steam system, assure the piping is NPT Vent. Leave connection vented to at mo sphere properly trapped and oriented.

  • Page 3: Maintenance

    1164-55, main te nance must where installed. include a level of clean li ness equal to Cashco’s cleaning standard #S-1134. Contact factory 2. Owner should refer to owner’s procedures for for details.
  • Page 4 NOTE: On regulators originally Rec om mend ed torques are as follows: sup plied with Option 1164-55, “special cleaned”, main te nance must include a level of clean li ness equal to Cashco’s cleaning standard Metal Dia- Regulator Size Bolt Size #S-1134.

  • Page 5: Troubleshooting Guide

    Upstream (inlet) pressure build-up occurring that over- stresses diaphragms. Relocate regulator or protect with safety relief valve. Sluggish operation. Possible Causes Remedies Plugged spring chamber vent. Clean vent opening. Fluid too viscous. Heat fluid. Contact factory. Broken spring. Replace spring. IOM-1164...

  • 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 Figure 1 Basic Model 1164 Metal Seat Construction Item No. Description Body Spring Chamber Range Spring Spring Button Pressure Plate Name Plate Spring Adjusting Screw Lock Nut Diaphragm Diaphragm Gasket O-Ring Figure 2 Valve Guide Composition Seat Cap Screw (Flange Bolting)
  • Page 8 ATEX requires that all components and equipment be evaluated. Cashco pressure regulators are considered components. Based on the ATEX Directive, Cashco considers the location where the pressure regulators are installed to be classified Equipment-group II, Category 3 because flammable gases would only be present for a short period of time in the event of a leak.
  • 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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