Circle Seal Corporation

Owen T O'Brien

James H Riley

A high resolution micro-metering valve having a non-rotary needle valve supported between a pair of calibrated coil springs of widely different spring rates. The lower rate spring is axially adjustable in minute increments by the valve actuator to vary the loading on the higher rate spring in an amount proportional to the ratio of the two spring rates. The valve actuator is free of all backlash and all relative movement with the valve packing is restricted to non-rotary axial movement. The valve proper can be contoured at will to provide linear or non-linear flow characteristics without need for any change in either of the two coil springs.

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Torrance, CA, United States of America

Owen T O'Brien