Pilot valve

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 4664135
SERIAL NO

06638180

Stats

ATTORNEY / AGENT: (SPONSORED)

Importance

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Abstract

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A pilot valve suited for use as the first stage of a large hydraulic valve system. The pilot valve virtually eliminates the steady state fluid leakage associated with orifice-based prior art systems. A pair of low noise and long life fluid restrictors are employed having flat openings thereto over which a flexible metal strip is disposed. The ends of the strip adjacent each opening are attached to one edge of rolling members whereby they can be rolled progressively off of and over the openings by an electrically driven actuator. In this manner, fluid flow through the two restrictor paths are controlled simultaneously to change the amount of fluid passing therethrough. Taps are provided in each restrictor for taking out the control fluid flow and pressure which are applied to the main valve as the driving means thereto.

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Patent Owner(s)

Patent OwnerAddress
SANDERS ASSOCIATES INC NEW HAMPSHIRE A CORP OF DEDANIEL WEBSTER HIGHWAY SOUTH NASHUA NH

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Hayner, Paul F Merrimack, NH 4 46

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