Pneumatic valve
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
May 4, 2004
Grant Date -
Oct 31, 2002
app pub date -
Jul 30, 2001
filing date -
Apr 27, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A pneumatic valve, includes a housing having first and second ports for entry and exit of an operating gas, a main connection line for linking the ports, and a cross bore intersecting the main connection line. A throttle includes a control element which is received in the cross bore and has a control opening with an effective area which progressively decreases from a first end position to a second end position, as the control element moves in a direction toward the second end position, whereby a counterforce is provided to oppose this movement of the control element. Disposed in the main connection line in series with the throttle is a flow orifice, wherein a gas pressure differential upstream and downstream of the flow orifice, as viewed in movement direction of the control element, is utilized to control the effective area of the control opening.
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