Pilot mode two-port solenoid valve

Details Pilot mode two-port solenoid valve Pilot mode two-port solenoid valve

1986-08-15

1988-01-05

Michalsky, Gerald A.

Valves and valve actuation

Fluid actuated or retarded

Pilot or servo type motor

251 3003, 251 45, F16K 3140

Patent

active

047171162

ABSTRACT:
A two-port solenoid valve of the pilot-assisted type that is designed to function even when there is no pressure difference between the primary and secondary control passages. A pilot valve actuated by the armature of a solenoid opens and closes a pilot discharge passage, with the armature being also adapted to open the main valve that is connected thereto by means of a lifting spring. The pilot discharge passage immovably provided in the valve housing is intended for suppressing the vibration of the main valve in closing. The pilot valve thart comes in and out of contact with the pilot valve seat at one end of the pilot discharge passage is spring-thrusted in the closing direction and attached to the armature. An inwardly projecting hitching rim is provided at the bottom of the armature that is adapted to stop the pilot valve toward the end of the attraction stroke in which the armature is pulled toward the stationary core, thereby ensuring that the pilot valve is released while a large drawing force is secured in the final stage of the attraction stroke.

REFERENCES:
patent: 3208716 (1965-09-01), Rolfe
patent: 3677298 (1972-07-01), Greenwood et al.
patent: 3994318 (1976-11-01), Ishigaki
patent: 4082116 (1978-04-01), Stampfli
patent: 4295631 (1981-10-01), Allen
patent: 4409580 (1983-10-01), Ishigaki

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