Static and dynamic pressure balance double flow three-way contro

Details Static and dynamic pressure balance double flow three-way contro Static and dynamic pressure balance double flow three-way contro

1994-09-13

1997-02-04

Michalsky, Gerald A.

Fluid handling

Systems

Multi-way valve unit

13762534, 13762568, 13762569, 25112907, 2511291, F15B 13044, F16K 324, F16K 3106

Patent

active

055988717

ABSTRACT:
A statically and dynamically pressure balanced fluid control valve. The valve contains a spool that is moved within an inner chamber of a valve housing by a pair of solenoids. The ports are symmetrically located on each side of a center port, wherein the resultant fluid forces on the spool are in opposite directions. The opposing forces create a net fluid force of approximately zero, so that the spool is dynamically pressure balanced when the valve is switched to a new position. The spool also has an inner channel and a pair of end openings that are in fluid communication with the inner chamber of the valve. When the spool is pulled to a new position, the end openings and inner channel allow fluid within the inner chamber to flow out of the space between the end of the spool and the housing. The flow of fluid through the end openings and inner channel prevent the formation of hydrostatic fluid pressure that will counteract the movement of the spool. The end openings and inner channel thus statically pressure balance the spool within the valve.

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