Spool drive for pressure regulating, proportional solenoid valve

Details Spool drive for pressure regulating, proportional solenoid valve Spool drive for pressure regulating, proportional solenoid valve

1985-01-30

1987-05-05

Scott, Samuel

Valves and valve actuation

Electrically actuated valve

Having means to produce proportional flow

25112915, 137 14, 13762569, 91429, 91433, F16K 3102

Patent

active

046626050

ABSTRACT:
A pressure regulating spool valve 10 having a body 25 within which a spool 20 is moved in a dither motion by a proportional solenoid 15 has a spool land 40 separating high and low pressure fluids and spanning and cooperating with a regulated port recess 51 in body 25 for variably opening high and low pressure windows 54 and 55. With opposite edges 52 and 53 of recess 51 spaced apart by a distance X, the opposite edges 42 and 43 of spool land 40 spaced apart by a distance Y, and the dither motion imposed on spool 20 by solenoid 15 having an axial excursion A, the relationship X.ltoreq.Y.ltoreq.(X+A) applies. This makes the alternating overlap of spool land 40 with recess edges 52 and 53 equal to or less than the dither excursion so that high and low pressure windows 54 and 55 of the regulated port 50 are opened for a predetermined portion of each half cycle of the dither motion.

REFERENCES:
patent: Re25494 (1963-12-01), MacDuff
patent: 2455315 (1948-11-01), Rose et al.
patent: 2681116 (1954-06-01), Treseder
patent: 2781743 (1957-02-01), Mann et al.
patent: 3174505 (1965-03-01), Bauer
patent: 3802453 (1974-04-01), Fleury
patent: 3880476 (1975-04-01), Belart et al.
patent: 4071042 (1978-01-01), Lombard et al.
patent: 4103695 (1978-08-01), Aono
patent: 4119294 (1978-10-01), Schnorrenberg
patent: 4316599 (1982-02-01), Bouvet et al.
patent: 4478250 (1984-10-01), Lukasczyk et al.

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