Diaphragm type of pilot operated directional control valve

Details Diaphragm type of pilot operated directional control valve Diaphragm type of pilot operated directional control valve

1988-03-16

1989-10-24

Michalsky, Gerald A.

Fluid handling

Systems

Supply and exhaust

13759614, 13759615, F15B 13042

Patent

active

048755001

ABSTRACT:
A pilot operated directional control valve having a diaphragm held between a passage block which has a feeding port, at least one loading port and at least one discharge port, and an opposed control block which has pilot pressure passages. The ports of the passage block open into the end face of the passage block adjacent to the control block through respective fluid passages. The pilot pressure is exerted on the diaphragm by the pilot pressure passages to control the fluid connection between the ports of the passage block. The fluid passages are located in a concentric arrangement.
The diaphragm has a center valve portion with an annular valve portion therearound. The two valve portions can be independently controlled by the pilot pressure acting thereon to control the fluid connection between the two adjacent fluid passages.

REFERENCES:
patent: 2427441 (1947-09-01), Butts
patent: 3080887 (1963-03-01), Brandenberg
patent: 4046159 (1977-09-01), Pegourie
patent: 4221361 (1980-09-01), Weingarten
patent: 4516605 (1985-05-01), Taplin
patent: 4744388 (1988-05-01), Ariizumi et al.

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