Shut-off device for a fluid
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United States of America Patent
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-
Feb 26, 1985
Grant Date -
N/A
app pub date -
Jul 14, 1983
filing date -
Jul 15, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A shutoff device for a fluid with a body having a conduit in which, in use, the fluid flows, a plunger arranged slidingly in a seat formed in the body and provided with an end portion suited to shut off said conduit, and means controlling the movement of the plunger into said seat. The control means comprise at least in particular a member having a hollow shape, made in piezoelectric material and arranged inside a chamber formed in the body and communicating with part of the surface of said plunger. Into the chamber is contained a liquid which is subjected to pressure changes as a consequence of the volume changes induced in the piezoelectric member; said liquid causes the movement of the plunger and consequently the shutoff of the conduit.
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