Actuating valve for bidirectional pneumatic cylinder and use of such actuating valve for bobbin creels controlled by pneumatic cylinders
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United States of America Patent
Stats
-
Feb 1, 2005
Grant Date -
Oct 30, 2003
app pub date -
Apr 25, 2003
filing date -
Apr 26, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An actuating valve has two relay valves connected to a compressed air source and a pneumatic cylinder with two pressure chambers. When one relay valve is actuated, one pressure chamber is pressure-loaded and the other is relieved. Two 3/2 port directional control valves are arranged upstream of the pneumatic cylinder. Two check valves are positioned in branch lines connecting the relay valves and the directional control valves. A control line connects the branch line to the other directional control valve, respectively. The directional control valves are moveable between a first position allowing compressed air to pass and a pressure relief position. When the relay valves are inactive, the directional control valves are in the first position and the relay valves are in a venting position for the branch lines. When one relay valve is actuated, it assumes a position allowing passage of air to the branch line connected to it.
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