Fluid pressure control valve for hydraulic actuator

Details Fluid pressure control valve for hydraulic actuator Fluid pressure control valve for hydraulic actuator

1986-02-28

1987-03-24

Michalsky, Gerald A.

Fluid handling

Systems

Multi-way valve unit

1376253, 251324, 474 28, F15B 1304, F16K 324

Patent

active

046517766

ABSTRACT:
A fluid pressure control valve for a hydraulic actuator has a valve body having a valve bore and a fluid port for discharging a fluid toward the hydraulic actuator, and a spool slidably received in the valve bore. The spool has a cylindrical spool section slidably fitted in the valve bore for closing the fluid port and a tapered spool section having a conical shape for opening the fluid port through annular open clearance of a variable area between the concial surface of the spool and the cylindrical surface of the valve bore. Between the cylindrical ad tapered spool sections, there is formed an annular groove or an annular face forming a step for preventing particles of dust suspended in the fluid from being bitten between the tapered spool section and the cylindrical surface of the valve bore by traping the particles. Furthermore, a radial groove is formed in a side wall of the fluid port in order to prevent a sudden change in the opening area which would be otherwise caused by an abrupt change of the spool contour due to the annular groove or the annular face.

REFERENCES:
patent: 3971216 (1976-07-01), Miller
patent: 4313467 (1982-02-01), Lang
patent: 4371002 (1983-02-01), Tischer
patent: 4533340 (1985-08-01), Abo et al.

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