Cashco CA-2 - Manual

Supply
@ P
1
SRV PI System
Bypass
P
1
P
2
Discharge
MODELS CA-1 AND CA-2
BACK PRESSURE / RELIEF REGULATORS
SECTION I
DESCRIPTION AND SCOPE I.
SECTION II
Recommended Piping Schematic For Back Pressure/Relief Station
Models CA-1 and CA-2 are back pressure/relief regulators used to control upstream (inlet or P
1
) pressure. Sizes for
CA-1 – 1/8" and 1/4" (DN6 and DN8); for CA-2 – 3/8" and 1/2" (DN10 and DN15). Both models are bronze bodied
units. With proper trim utili za tion, both units are suitable for liquid and gaseous service. Refer to Tech ni cal Bul le tin
CA-TB for specifi c design conditions and selection rec om men da tions.
II. INSTALLATION
INSTALLATION, OPERATION & MAINTENANCE MANUAL IOM-CA
12-13
This is not a safety device and must not be sub sti tut ed for a code approved pressure
safety relief valve or rupture disc.
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 removal
from piping.
4. An inlet pressure gauge should be located ap -
proxi mately ten pipe diameters upstream, and
within sight. An outlet pressure gauge is op -
tion al.
5. All installations should include an upstream
safe ty relief de vice if the inlet pressure could
ex ceed the pres sure rating of any equip ment or
the max i mum inlet pres sure rating of the unit.
WARNING 1
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 destroy
dia phragms. DO NOT HYDRO STATIC TEST THRU AN
IN STALLED UNIT; ISO LATE FROM TEST.)
The instructions in this manual will refer to both models, unless otherwise stated.
CAUTION A
6. Clean piping of all foreign material including chips,
welding scale, oil, grease and dirt before 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 regulator upon
startup.
8. Flow Direction: Install so the flow di rec tion
aligns with the word “IN” stamped on the body.
Con nect the inlet pres sure to the body (1) side
Models CA-1/CA-2
BP/Relief Regulator
Flow-Thru Design