Filter device having relief valve for use in power steering syst

Details Filter device having relief valve for use in power steering syst Filter device having relief valve for use in power steering syst

1984-03-12

1985-05-14

Richman, Barry S.

Liquid purification or separation

Flow, fluid pressure or material level, responsive

Fluid pressure responsive by-pass

55313, 55314, B01D 2914

Patent

active

045170835

ABSTRACT:
A filter device for use in the return line of a power steering system for filtering the fine metal particles in the power steering fluid, thereby minimizing contamination, reducing friction and maintaining normal fluid temperatures. A perforated support plate is mounted between an upper body wall and a lower body wall for separating the housing interior into an inlet chamber and an outlet chamber. A felt filter disc is located in intimate contact with the support plate on the inlet chamber side of such plate for filtering the particles from the inlet fluid prior to the passage of the fluid through the filter and the holes in the support plate into the outlet chamber. A relief valve is provided by the combination of the aligned central opening in both the support plate and the adjacent filter disc together with a boss in the upper body wall which extends into such central opening in sealing engagement against the filter material for closing off the relief valve opening under normal filtering conditions. The flexure of the support plate is designed so that when the filter becomes clogged with particles to cause a build up of fluid pressure by a predetermined amount, the support plate flexes and moves away from the valve boss thereby permitting the fluid to bypass the filter material and pass into the outlet chamber via the relief valve opening.

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IBM Technical Disclosure Bulletin, J. H. Meiser, "Pneumatic Diode or Check Valve Device", Apr. 1963.

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