Cla-Val PV30 - Manual

INSTALLATION
1. All Cla-Val PV30 Pinch Valves have standard 125/150# flat
faced flanges. Other flange standards are available. Consult
factory for further information.
2. For best performance, a flat faced serrated flange should be
mated to the pinch valve flange face.
• smooth faced flanges may not seal properly
• raised-faced flanges may damage the rubber flange
3. The valve body flanges are supplied with threaded holes. Care
should be taken to use the correct length of bolts to prevent
"bottoming" which may crack the housing.
4. Valve should be installed where it is easily accessible for
service. Whenever possible allow room on all sides of valve
for maintenance of valve components. Technicians should
consult separate manufacturer’s operating instructions for
auxiliary controls.
5. Be sure that the pipeline and mating flanges are clean of any
foreign or old gasket material, which may damage the valve
or prevent proper sealing. Avoid using sharp tools (screwdrivers,
crow bars etc.) to install the valve. These can damage the
sealing faces and cause leakage.
6. Cla-Val PV30 Pinch Valves are designed to be installed in any
position. However if the operating air is not dry then it is
recommended that the valve should be rotated so that the
"Drain Plug" is on the bottom to allow for proper drainage of
condensate from the valve housing.
7. Cla-Val PV30 Pinch Valve is supplied with the diamond seal
gasket extruded, pushing the rubber flanges away from the
body. Do not trim the extruded gasket, it will reseat once the
valve is bolted in the line. A 1/8" extrusion is normal and
required for a good seal.
8. The mating pipeline should be properly aligned. Sufficient
space should be allowed between mating flanges for the PV30
to be installed and a tight seal achieved once bolted.
Note: The valve will not stretch to accommodate any extra
space. Flange gaskets which are normally not required may be
used as spacers.
9. Tighten all flange bolts in a criss-cross pattern (see Figure 1)
to the maximum torque recommended for the metal mating
flanges. The rubber flange can not be over-torqued. It is
recommended that all hardware must be immediately checked
after the valve is in operation to compensate for rubber setting.
OPERATION
Cla-Val PV30 Pinch Valves are a fully enclosed body, direct
loaded pressure jacket type. These operate by a simple application
of pneumatic or hydraulic pressure through the annular connection
in the housing to the elastomeric sleeve. Pressure causes the
sleeve to collapse and provide a tight seal.
NOTE: 2 WAY "BUBBLE TIGHT CLOSURE
Where a 2-way "Bubble Tight" closure is required (sizes 8" and
above only), the elastomeric sleeve must be installed in one
particular manner. The two arrows must be parallel with valve
gaskets in the body casting.
Various control instruments (i.e. vacuum generators, solenoids
pressure reducing valves etc.) can be connected to the valve to
meet the required application.
1. Attach air supply to the valve housing at the threaded
connection. (For operation of control instruments refer to the
manufacturer’s installation and operation manuals supplied).
CAUTION: For the successful operation of Cla-Val PV30 Pinch
Valve, minimum amount of supply pressure should be used. Do
not apply more supply pressure than specified to close the
valve. Most Cla-Val PV30 valves require 30 psi supply pres-
sure in addition to the line pressure. If 30 psi closes the valve
then operating the valve at 45 or 50 psi will shorten the life of
the sleeve, since the differential pressure across the sleeve is
greater. This will cause premature sleeve failure.
2. Always use a pressure reducing valve and an integral gauge
on the air supply line. This one single factor can affect sleeve
life by 50%. The supply pressure can be cut back another 5 psi,
after 2-3 weeks of operation (once the sleeve has been "set").
3. Only use clean, dry air or specified hydraulic fluid to operate
the valve.
PV30
Split-Body Pinch Valve
SERIES
INSTALLATION / OPERATION / MAINTENANCE
1
2
3
4
5
6
7
8
Figure 1