Cashco C-BPV - Manual

III. PRINCIPLE OF OPERATION
A. General:
1. Movement occurs as pressure variations reg-
is ter on the diaphragm. The registering pres-
sure is the inlet, P
1
or upstream pressure. The
range spring opposes diaphragm movement.
SECTION III
As the inlet pressure drops, the range spring
pushes the diaphragm down, closing the port;
as inlet pressure increases, the diaphragm
pushes up and the port opens.
2. A complete diaphragm failure may cause the
regulator to fail close, and process fl uid will
discharge from the spring chamber vent hole.
CAUTION
SECTION II
II. INSTALLATION
A. General:
1. A diaphragm valve should be installed up-
stream of the regulator.
2. An inlet pressure gauge should be located
ap prox i mate ly ten pipe diameters upstream
and within sight.
3. All installations should include an upstream
relief device if the inlet pressure could exceed
the pressure rating of any equip ment or the
maximum inlet pressure rating of the unit.
4. Flow Direction: Install so fl ow enters through
the side connection and exits the bottom con-
nection.
5. Install with spring chamber (2) in the vertical
up po si tion to allow for proper draining.
I. DESCRIPTION AND SCOPE
Model C-BPV is a self-contained back pressure / relief regulator utilized in sanitary biotechnological process piping
systems and is used to control upstream (inlet or P
1
) pressure. Inlet and outlet sizes are 3/4", 1", 1-1/2", 2" and 3".
This angle style regulator is only suit able for liquids and gases at temperatures less than 300°F (149°C). Refer to
Technical Bulletin C-BPV-TB for specifi c design con di tions.
SECTION l
MODEL C-BPV
BACK PRESSURE / RELIEF REG U LA TOR
IOM-C-BPV
12-13
INSTALLATION, OPERATION & MAINTENANCE MANUAL (IOM)
CAUTION
This is not a safety device and must not be substituted for a code approved pressure safety relief valve or a rupture disc.
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.