Hydraulic valves

Details Hydraulic valves Hydraulic valves

1995-12-01

1998-09-15

Michalsky, Gerald A.

Fluid handling

Systems

Multi-way valve unit

13762564, F15B 13043

Patent

active

058065652

ABSTRACT:
A hydraulic valve includes a spool movable within a body to regulate flow across the valve. Movement of the spool is controlled by an electromagnetic actuator that operates either directly or through a pilot stage upon the spool. When operating through a pilot stage, the actuator varies pilot pressure by an operating member co-operating with an orifice. A flapper valve may be used to vary a pair of pilot flows in complementary manner. Feedback signals of pressure and spool position are provided to a controller which selectively combines the signals to monitor the operating parameters of the valve. The controller may modify the position signal with the pressure signal to obtain an indication of flow rate through the valve.

REFERENCES:
patent: 2920650 (1960-01-01), Moog
patent: 4061155 (1977-12-01), Sopha
patent: 4526201 (1985-07-01), Geylar et al.
patent: 4970941 (1990-11-01), Reinhardt

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