Hydraulically actuated spool valve

Details Hydraulically actuated spool valve Hydraulically actuated spool valve

1985-04-08

1986-11-18

Michalsky, Gerald A.

Fluid handling

Systems

Multi-way valve unit

13762562, 13762563, 13762564, F15B 13043

Patent

active

046230033

ABSTRACT:
A reduced drive area hydraulically actuated spool valve is protected against cavitation and provided with enhanced lubrication by connecting the variable volume inside the valve housing adjacent the non drive area of the spool end to the source of pressure fluid controlled by the valve. A stub piston is affixed to the spool end in fluid tight relationship, e.g. integral, to exclude the pressure fluid from the area therebetween. A floating cylinder is provided for the stub piston to eliminate the need for precise alignment of the stub piston axis with respect to the housing. Fluid passages substantially balance the fluid force acting on this floating cylinder to keep it from binding, this being just enough unbalance to hold the cylinder end against a ball pivot.

REFERENCES:
patent: 2931389 (1960-04-01), Moog et al.
patent: 2964059 (1960-12-01), Geyer
patent: 3464318 (1969-09-01), Thayer et al.
patent: 3473548 (1969-10-01), Ericson et al.
patent: 3690345 (1972-09-01), Ericson et al.
patent: 3983908 (1976-10-01), Bartholomaeus
patent: 4094229 (1978-06-01), Leonard
Moog Servovalve, 2 sheets.

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