cashco 1164 Installation, Operation & Maintenance Manual

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, fl ow-thru,) 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 pres-
sure rating of any equipment or the maximum inlet
pressure rating of the unit.
WARNING
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
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 fl ow 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).
CAUTION
Installation of adequate overpressure pro tec tion is recom-
mended 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
07-04