Recirculation valve with pilot valve

Details Recirculation valve with pilot valve Recirculation valve with pilot valve

1990-02-22

1990-11-06

Nilson, Robert G.

Fluid handling

Self-proportioning or correlating systems

Self-controlled branched flow systems

137117, G05D 701

Patent

active

049677837

ABSTRACT:
A recirculation valve with pilot valve. The claimed invention comprises a housing containing an inlet chamber for receiving liquid from a pump, an outlet chamber for transporting liquid downstream of said valve and a recirculation port for recirculating liquid back to said pump; check valve means dividing said inlet and outlet chambers and extending substantially transverse thereto, the check valve means opening to permit the flow of liquid between the inlet and outlet chambers when the check valve means is in a first position and preventing flow when the check valve means is in a second position; a chamber for transferring liquid between said inlet chamber and a by-pass valve means, the by-pass valve means being axially aligned with said check valve means and comprising an outer sleeve having a plurality of seats and a slidable inner stem, said inner stem having a plurality of lands which slidable mate with said seats to close off flow through said by-pass valve when said check valve is in a first position and which disalign to permit flow through said by-pass valve when said check valve means is in a second position. The movement of said recirculation stem is directly controlled by a pilot valve which regulate the water pressure and quantity of a piston chamber located beneath the stem.

REFERENCES:
patent: 4019527 (1977-04-01), Brand
patent: 4095611 (1978-06-01), Hetz

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