INSTALLATION, OPERATION & MAINTENANCE MANUAL
IOM-C-PRV
12-19
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
®
fitting 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 specific 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 flow enters through
the bottom connection and exits the side
connection.
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. Confirm 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
overpressure 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.
ISO Registered Company
