Valves and valve actuation – Fluid actuated or retarded – Pilot or servo type motor
Patent
1987-04-28
1988-06-14
Rosenthal, Arnold
Valves and valve actuation
Fluid actuated or retarded
Pilot or servo type motor
25112918, 25112921, 25112908, F16K 1706
Patent
active
047507047
ABSTRACT:
A remotely controllable fluid valve includes a solenoid-armature arrangement which functions as an electro-magnetic spring having improved force-displacement characteristics over a mechanical spring. The solenoid magnetizes a pair of axially spaced, sleevelike field poles. The armature is so shaped and initially positioned relative to the field poles that: as the armature, supported in one pole, moves further into the other pole, the axial magnetic force thereon decreases at a decreasing rate with the rate of decrease being greater at higher levels of solenoid energization.
REFERENCES:
patent: 3069846 (1962-12-01), Buescher
patent: 3791408 (1974-02-01), Saitou et al.
patent: 3945399 (1976-03-01), Tirelli
patent: 4206781 (1980-06-01), Salter
Brundage Robert W.
Rosenthal Arnold
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