Servovalve

Details Servovalve Servovalve

1985-01-24

1986-11-25

Dority, Jr., Carroll B.

Fluid handling

Systems

Multi-way valve unit

13762564, 91365, 91387, 403122, F16K 1107

Patent

active

046242848

ABSTRACT:
A servovalve includes a flow-control valve connectable between a source of fluid pressure and a load and having a spool displaceable between an open position permitting fluid flow between the load and the source and a closed position axially offset therefrom and blocking such flow. A pilot valve has an impact plate and a pair of nozzles operatively axially oppositely effective on the spool and oppositely flanking the plate. Thus when the plate is closer to one of the nozzles than to the other the spool is axially displaced into one of its positions and when the plate is closer to the other nozzle the spool is urged axially oppositely. A solenoid-type servomotor is connected to the impact plate to move same between the nozzles so that when it is close to one nozzle it blocks flow therefrom and allows pressure to build up on the corresponding end of the spool, while the other nozzle is opened to reduce pressure at the corresponding spool end. A feedback spring is attached to the impact plate, extends generally radially of the spool, and has a free end projecting into a recess formed in the spool. A force-transmitting ball is fixed to the free end of the spring and fitted in the recess and has an outer surface engageable with the inner surface of the recess. The outer surface of the ball is of corundum and the inner surface of the bore is of steel or vice versa.

REFERENCES:
patent: 634204 (1899-10-01), Diehl
patent: 3391901 (1968-07-01), Wheeler et al.
patent: 3814131 (1974-06-01), Takahashi et al.
patent: 3972233 (1976-08-01), Pelt et al.
patent: 4285358 (1981-08-01), Haydt
Rexroth literature, RD 29 633, 8/81.
Rexroth literature, RD 29 584, 4/79.

Affiliated with

Also associated with

Rating

Servovalve does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Servovalve, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Servovalve will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1153730