Solenoid-operated two-way directional needle-valve, normally clo

Details Solenoid-operated two-way directional needle-valve, normally clo Solenoid-operated two-way directional needle-valve, normally clo

1982-09-16

1986-06-03

Schwadron, Martin P.

Valves and valve actuation

Fluid actuated or retarded

Pilot or servo type motor

251 76, 251 77, 25112915, F16K 31124, F16K 3102

Patent

active

045925330

ABSTRACT:
The valve described herein comprises a movable core (28) which is drawn toward a fixed core (21) once the valve is opened by excitation of its coil, or solenoid (24). The valve's needle-obturator (17) is capable of moving axially with respect to the movable core (28) but, upon the coil's being excited, remains thrust into the orifice (16) during a first opening stage while the movable core only (28) is caused to rise. Subsequently--once the movable core (28) arrives within a few millimeters of the fixed core--a shoulder (51) offered by the movable core to a shoulder (18) incorporated in the obturator (17) duly makes contact and draws the latter upward, whereupon the action of a spring (27) overcomes such resistance as is offered by a further spring (19) and the obturator itself (17) is raised to a generous distance from its seat in orifice (16) aforesaid.

REFERENCES:
patent: 1944113 (1934-01-01), Shenton
patent: 2622618 (1952-12-01), Ghormley
patent: 2965350 (1960-12-01), Knaebel et al.
patent: 3100103 (1963-08-01), Bullard
patent: 3738607 (1973-06-01), Peruglia
patent: 3970282 (1976-07-01), Hansen

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