Pressure control valve

Details Pressure control valve Pressure control valve

1989-11-02

1991-05-14

Michalsky, Gerald A.

Fluid handling

Systems

Multi-way valve unit

25112916, F15B 13044

Patent

active

050147471

ABSTRACT:
A pressure control valve has a valve sleeve, a spool valve mounted for sliding in the valve sleeve in response to a load by an electromagnet, a spring load, and an output pressure feedback load, and the electromagnet portion capable of moving the spool valve. The spool valve has an oil passage capable of feeding back the output pressure, the feedback oil passage being formed diagonally in the land portion. A periphery of an end surface of the land portion, or the same of the supply port, output port, or the exhaust port of the sleeve is provided with a cutout. Output pressure generated at the output port is transmitted through the feedback oil passage, thereby damping and stabilizing the operation of the spool valve. Since the cutout is formed as described above, a rapid pressure change due to the movement of the spool valve can be eliminated, preventing generation of buzz.

REFERENCES:
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patent: 3880476 (1975-04-01), Belart et al.
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patent: 4250922 (1981-02-01), Will et al.
patent: 4316599 (1982-02-01), Bouvet et al.
patent: 4535816 (1985-08-01), Feder et al.
patent: 4579145 (1986-04-01), Leiber et al.
patent: 4605197 (1986-08-01), Casey et al.
patent: 4635683 (1987-01-01), Nielsen
patent: 4662605 (1987-05-01), Garcia
patent: 4739797 (1988-04-01), Scheffel
patent: 4838313 (1989-06-01), Kobayashi et al.
patent: 4838517 (1989-06-01), Miki et al.
patent: 4838518 (1989-06-01), Kobayashi et al.

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