Valves and valve actuation – Heat or buoyancy motor actuated
Patent
1987-08-27
1989-06-06
Rosenthal, Arnold
Valves and valve actuation
Heat or buoyancy motor actuated
60527, 60528, F16K 3102, F16K 3164
Patent
active
048364967
ABSTRACT:
An SME actuator is provided by a housing (14), a plunger (12) axially reciprocal in the housing, a compression spring (16) or Belleville washers (60) biasing the plunger in one direction, SME (shape memory effect) disc washers (18) around the plunger and thermally deformable to move the plunger in the opposite direction, and a concentric electrical resistance heater (36) and/or fluid inlet and outlet ports (8, 10 or 86, 88) for thermally actuating the SME disc washers to in turn move the plunger. Multi-position control is provided by a stack of a plurality of SME Belleville disc washers of differing transition temperatures. Alternatively, the washers can all have the same transition temperature and operate proportionally with increasing or decreasing temperatures. Another version is provided by an SME torsion bar (96) and threaded drive element (104) for axially translating the plunger (112).
REFERENCES:
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patent: 3174851 (1965-03-01), Buehler et al.
patent: 3205675 (1965-09-01), Matthies
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patent: 4268006 (1981-05-01), Kunz et al.
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patent: 4472113 (1984-09-01), Rogen
patent: 4531988 (1985-07-01), Todoroki et al.
patent: 4570852 (1986-02-01), Ohkata
"Thermobimetallic Compositions Processing Properties", Bashnin et al, Moscow, Mashinos Aroeyeme, 1986.
Abujudom David N.
Miller Dennis E.
Johnson Service Company
Rosenthal Arnold
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