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 The
Series 4700 Spun Aluminum Pinch Valve is designed
for low pressure service, in control or on/off
applications. The Series 4700 is similar
to the Type A, but the body is constructed entirely
of spun aluminum for weight savings and easy
installation. The air actuated Series
4700 is ideal for O.E.M accounts, Gravity Flow
Applications, Pneumatic Conveying Systems and
Waste Treatment Plants.
The
Series 4700 Pinch Valve’s unique design makes
them the most cost effective, maintenance-free
automatic valves available. The key to
this valve is in the flexible reinforced rubber
sleeve - the valve’s only wetted part.
Actuation
of the valve, the pinching action, is accomplished
by air or hydraulic pressure placed upon the
sleeve. The valve body acts as a built-in
actuator, eliminating costly pneumatic, hydraulic
or electric actuators. Adding air pressure
within the annular space between the housing
and sleeve can open, throttle, or close the
valve. In general, 25 psi over line pressure
is required for full closure.
The sleeve’s flexibility allows the valve to
close “drop tight” around entrapped solids,
eliminating “hang ups” without ever damaging
the valve itself. Sealing area is equal
to 95% of the valve’s length. With the
Series 4700, there are no seats or packing to
replace, cavities or dead spots to collect debris
and bind valve operation. When the valve
is open, it is like a straight piece of pipe
in the line. These valves are used in
remote locations or harsh environments since
there are no external links, levers, pistons,
or rotating parts to cause downtime, and can
even be buried underground. When installing
the Series 4700, it is recommended that galvanized
steel back up rings be used behind the valve
flanges.
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Lightweight valve design 
