Fluid handling – Systems – Multi-way valve unit
Patent
1988-12-27
1991-01-29
Michalsky, Gerald A.
Fluid handling
Systems
Multi-way valve unit
13762564, F15B 13044
Patent
active
049879278
ABSTRACT:
A direct-drive hydraulic control valve having a valve spool mounted in a spool bore and variably positioned in the bore to control a flow of pressure fluid from a source to a controlled device, shown as a hydraulic cylinder. The valve is driven by a reversible electric D.C. torque motor of the incremental stepper type having an eccentric output shaft that projects into a central opening in the valve spool and is engaged on its opposite sides by elongated drive pins that are movably mounted in longitudinal bores in the opposite end portions of the spool. Each drive pin engages a ball that is seated in the end of the longitudinal bore in a pressure chamber at the end of the spool bore, forming a check valve, and drives the spool through the ball, which normally is held in place by high pressure fluid in the end pressure chamber. If the resistance to movement of the spool rises to exceed the seating force on the ball, the drive pin unseats the ball at the leading end of the spool, venting the pressure chamber at the leading end so that a pressure differential is created across the spool for a hydraulic boost in the driving force on the spool. One alternative drive mechanism uses a lever, pivoted between its ends, connectible to a linear drive motor, instead of the eccentric shaft and stepper motor.
REFERENCES:
patent: 3114394 (1963-12-01), Panissida
patent: 3455334 (1969-07-01), Martinson
patent: 3756278 (1973-09-01), Melf
patent: 3865140 (1975-02-01), Greenwood
patent: 4672992 (1987-06-01), Vanderlaan et al.
patent: 4844125 (1989-07-01), McKay et al.
Michalsky Gerald A.
Sterer Engineering and Manufacturing Company
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