Double-seal flexible gate valve

Fluid handling – With cleaner – lubrication added to fluid or liquid sealing... – Cleaning or steam sterilizing

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Details

137240, 137312, 251158, 251203, 251326, 251328, 251334, F16K 318, F16K 2500

Patent

active

047858443

ABSTRACT:
Disclosed is a gate valve for controlling flow, providing a dual seal, including a valve body having a discharge orifice. A gate assembly, located upstream of the discharge orifice, is movable between open and closed positions remote from and blocking the discharge orifice, respectively. The gate assembly includes upper and lower spaced flexible sealing disks which are attached to a relatively rigid upstream backup plate. Radially inner and outer valve seats are secured to the valve body adjacent the discharge orifice. When blocking flow through the valve body, each gate is wedged in sealing engagement with a respective valve seat and a chamber is formed between the two seals to receive seepage past the upstream seal. The chamber may be either evacuated or pressurized to prevent flow of controlled material past the lower or downstream seal. A camming bar attached to the gate assembly has upstream extending arms with inclined ends which engage inclined bars mounted to an upstream portion of the valve body, urging the gates into sealing engagement with their respective valve seats.

REFERENCES:
patent: 676580 (1901-06-01), French
patent: 989202 (1911-04-01), Snow
patent: 1235409 (1917-07-01), Aldrich
patent: 1826941 (1931-10-01), La Mont
patent: 1847385 (1932-03-01), Dengler
patent: 2128542 (1938-08-01), Snow
patent: 2893685 (1959-07-01), Van Camp
patent: 2947511 (1960-08-01), McInnes
patent: 3554486 (1971-01-01), Thebado
patent: 4131131 (1978-12-01), Frisch
patent: 4304251 (1981-12-01), Schadel et al.
patent: 4687015 (1987-08-01), Mieth

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