Pulse valve
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United States of America Patent
Stats
-
Jun 2, 1987
Grant Date -
N/A
app pub date -
Jan 13, 1986
filing date -
Jan 15, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A pulse valve having a valve body with a valve nozzle, a valve seat and a valve stem with a closing piece movably disposed in axial alignment with the valve seat for operating the valve and a valve drive including a stack of piezoelectric crystals arranged concentrically around the valve stem for operating the valve, the stack of piezoelectric crystals being supported by thermally and electrically insulating support members and being enclosed in a drive housing provided with means permitting evacuation thereof, the valve drive being separated from the valve body by a membrane mounted to the valve stem at the interface of the valve stem and forming a seal between the drive and the valve body to permit evacuation of the housing. The valve nozzle is provided with replaceable nozzle members with different nozzle openings.
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