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US 4,543,832 AGranted
Overload protected pressure transducer
AssigneeTransducers, Inc.
InventorWilliam E. Van Over
Life of this patent
Estimating the term…
Abstract
A liquid filled pressure transducer which utilizes a self activating lip seal type valve to create a sealed cavity within the transducer to prevent the flow of liquid from behind the pressure diaphragm and thereby prevent distortion of the diaphragm under overload conditions. A mechanical stop prevents excess displacement of the sensor element.
Claims10
A pressure transducer which comprises:
- (a) a housing, said housing having a cavity, said cavity being liquid filled and having an opening;
- (b) a force summing member forming a portion of the wall of said cavity;
- (c) means responsive to the displacement of said force summing member for creating an electrical signal;
- and
- (d) a self-activating lip seal comprising an elastomeric seal member and a seat for closing said opening when a predetermined pressure is applied to said force summing member, said elastomeric seal member being coupled to said force summing member, said self activating lip seal further including support means for said elastomeric seal member for preventing buckling of said elastomeric seal member due to liquid flow occasioned by an increase in said fluid pressure when said opening is closed.
2 more elements
A pressure transducer which comprises:
- (a) a body having opposed faces and a bore therethrough, said bore partially defining a passageway through said body connecting said faces;
- (b) a pair of diaphragms secured to said opposed faces whereby a cavity is formed between each diaphragm and one of said faces, said cavities and said passageway being liquid filled;
- (c) linkage means passing through said bore and coupled to the centers of said diaphragms;
- (d) means responsive to the displacement of said diaphragms for providing an electrical signal;
- and
- (e) a self activated lip seal including an elastomeric seal member and a seat in the first of said cavities, said self activated lip seal being operable responsive to displacement of said diaphragms for isolating said first cavity from said passageway whereby said liquid filling cannot flow from said first cavity into said passageway, said self activated seal member further including support means for said elastomeric seal member to prevent buckling of said elastomeric seal member due to fluid flow caused by motion of said diaphragms when said cavity is isolated from said passageway.
3 more elements
Dependencies are inferred from the claim text.