Fluid handling – Processes – With control of flow by a condition or characteristic of a...
Patent
1997-12-30
1999-12-14
Walton, George L.
Fluid handling
Processes
With control of flow by a condition or characteristic of a...
137239, 137528, 137270, 251 65, 25112901, 25112902, 25112921, F16K 1502, F16K 3102, F16K 3108
Patent
active
060004177
ABSTRACT:
A check valve is described which employs a magnetic biasing component, disposed external to the valve body, to exert force on a poppet, at least a portion of which is ferrous. In a "normal" mode of operation, the poppet is urged against the inlet end surface of the cavity by the basing component, and moves away from the inlet end surface of the cavity to permit fluid flow from an inlet port to an outlet (downstream) port once a differential cracking pressure is achieved. In a "bidirectional" or "purge" mode of operation, the biasing component is positioned adjacent the outlet end of the valve body to retain the poppet in an open position, away from the inlet end surface of the cavity. The bi-directional capability of the disclosed check valve is beneficial for welded installation and cyclic purging of systems, and allows for a full vacuum to be achieved because the effect of cracking pressure is eliminated. The external location of the biasing component eliminates the biasing component from the fluid flow, thereby avoiding contamination by particulates. Alternatively, the external biasing component can be ferrous, and the poppet magnetic. Biasing means can be disposed on both the upstream and downstream sides of the valve body.
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Linden Gerald E.
Walton George L.
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