Cla-Val 100-31 600 Series - Manual

Full Open Operation
When operating pressure below the
diaphragm is greater than the pres-
sure in the cover chamber, the valve
is held open, allowing full flow.
• Built-in Automatic Check Valve
• Reduced Cavitation Design
• Service Without Removal From Line
• Packless Construction
• Drip-Tight, Positive Seating
The Cla-Val Model 100-31 Powercheck Valve is a hydraulically oper-
ated diaphragm valve with a built-in check feature to prevent return
flow. Available in globe or angle pattern, it consists of four major com-
ponents: the body, intermediate chamber, diaphragm assembly and
cover. The diaphragm assembly is the only moving part.
The diaphragm assembly which is guided top, center and bottom by a
precision machined stem utilizes a non-wicking diaphragm of nylon
fabric bonded with synthetic rubber. A synthetic rubber disc retained
on three and one-half sides forms a drip-tight seal with the renewable
seat when pressure is applied above the diaphragm. When pressure
above the diaphragm is relieved, the valve opens wide. The rate of
closing or opening can be controlled by modulating the flow into or out
of the cover chamber. When a pressure reversal occurs the valve will
immediately close, preventing reverse flow through the valve. The
split stem will allow the disc retainer assembly to check closed
regardless of the position of the diaphragm.
The Model 100-31 Powercheck Valve is recommended on system
applications where a positive check feature is necessary to prevent
reverse flow.
100-31
600 Series
Powercheck Valve
Check Action
When a static condition or pressure
reversal occurs, the split stem design
allows the valve to instantly check
closed. Return flow is prevented
regardless of the diaphragm's position.
Tight Closing Operation
When pressure below the
diaphragm is relieved and operating
pressure is applied to the cover
chamber, the valve closes drip-tight.
Principle of Operation
4 - Way Control
4 - Way Control
4 - Way Control
Note: For optimum operation of built-in check feature, installation with stem vertically up is recommended.
MODEL
(Reduced Internal Port)