Directional control device

Details Directional control device Directional control device

1989-05-17

1991-04-02

Michalsky, Gerald A.

Fluid handling

Systems

Multi-way valve unit

251900, F15B 1304

Patent

active

050040154

ABSTRACT:
The present invention relates to the use of two different sealing means in a directional spool valve. On the one hand side, a pressure guide element is provided at the spool so as to make sure that the pressure medium can only flow in radial direction against a seal located in the housing. The second sealing means may be of different design. It is possible that a spool seat surface provided on the spool and moveable against the force of a spring is used, said spool seat surface being adapted to cooperate with a stationary seat surface provided at the housing; alternatively a plurality of control bores is provided in the housing in the area of a port, said bores having a relatively small diameter d, and wherein a seal located the spool is used for opening and closing said bores so that no damage of the seal can occur. It is also possible to make use of the last mentioned sealing principle by itself.

REFERENCES:
patent: 583822 (1897-06-01), Shem
patent: 1385019 (1921-07-01), Mathieu
patent: 2469921 (1949-05-01), Hoge
patent: 2556308 (1951-06-01), Weatherhead, Jr.
patent: 2910050 (1959-10-01), Dotter et al.
patent: 3076476 (1963-02-01), Campbell
patent: 4096880 (1978-06-01), Lemmon et al.
patent: 4458718 (1984-07-01), Vick

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