Fluid handling – Systems – Sequentially progressive opening or closing of plural valves
Patent
1979-03-26
1981-08-04
Rosenthal, Arnold
Fluid handling
Systems
Sequentially progressive opening or closing of plural valves
251 65, 251129, 335234, F16K 3108
Patent
active
042816858
ABSTRACT:
An electromagnetic locking type actuator is constituted by a control member reciprocatable in a fluid passage to control the fluid pressure in the passage, an electromagnetic device for applying a first magnetomotive force to the control member, and a magnetic device for always applying a second magnetomotive force to the control member. In the actuator, when an electric current in one direction is applied to the electromagnetic device the first and second magnetomotive forces are added to move the control member in an attracting direction so that the control member is attracted and held at its movement terminating position by the magnetic device even after the first magnetomotive force no longer acts at that position. When an electric current in a direction opposite to the one direction is applied to the electromagnetic device the first and second magnetomotive forces cancel each other thereby maintaining said control member in a magnetically released state.
REFERENCES:
patent: 3368788 (1968-02-01), Paduca
patent: 3379214 (1968-04-01), Weinberg
patent: 3458769 (1969-07-01), Stampfli
patent: 3635240 (1972-01-01), Vischulis et al.
patent: 3670768 (1972-06-01), Griswold
Rosenthal Arnold
Tokico Ltd.
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