Cashco C-PRV - Manual

INSTALLATION, OPERATION & MAINTENANCE MANUAL IOM-C-PRV
12-13
MODEL C-PRV
PRESSURE REDUCING REGULATOR
SECTION I
I. DESCRIPTION AND SCOPE
Model C-PRV is a pressure regulator used to control downstream (outlet or P
2
) pressure. Inlet and outlet sizes
are 1", 1-1/2", 2" and 3" with Tri-Clamp ® fi tting connections. This regulator is only suitable for liquids and gases at
temperatures less than 300°F (149°C). Refer to Technical Bulletin C-PRV-TB for specifi c design con di tions.
SECTION II
II. INSTALLATION
A. General:
1. An inlet block valve should always be installed
up stream of the regulator.
2. An outlet pressure gauge should be located
ap prox i mate ly ten pipe diameters down stream
and within sight.
3. All installations should include a downstream
re lief device if the inlet pressure could exceed
the pressure rating of any downstream equip-
ment.
4. Flow Direction: Install so fl ow enters through
the bottom connection and exits the side con-
nection.
5. Install with spring chamber (2) in the vertical
up position to allow for proper draining.
A. General:
1. Ensure that lock-open pin (10) and hitch pin
(15) are in proper po si tion. See Sec tion VII.
2. Confi rm that the proper range spring is in di -
cat ed to be within the regulator by inspection
of the unit’s nameplate. Apply setpoint pres-
sures that are only within the stated range.
SECTION IV
IV. START-UP
III. PRINCIPLE OF OPERATION
A. General:
1. Movement occurs as pressure vari a tions reg is-
ter on the di a phragm. The registering pres sure
is the outlet, P
2
or downstream pres sure. The
range spring op pos es diaphragm move ment.
As the outlet pressure drops, the range spring
pushes the diaphragm down, opening the port;
as outlet pressure increases, the diaphragm
pushes up and the port opening closes.
2. A complete diaphragm failure will cause the
reg u la tor to fail open
SECTION III
CAUTION
Installation of adequate overpressure pro tec tion is
recommended to pro tect the reg u la tor from overpres-
sure and all down stream equip ment from damage
in the event of regulator failure.
CAUTION
The Model C-PRV should never be used as a shutoff
device.