Fluid handling – Removable valve head and seat unit – Threaded into valve casing
Patent
1983-04-14
1985-03-12
Nilson, Robert G.
Fluid handling
Removable valve head and seat unit
Threaded into valve casing
137493, 1375395, F16K 1718
Patent
active
045038821
ABSTRACT:
A flow valve with a flow passage which exhibits a working flow path (A) and backflow path (R), having a pressure relief valve (18, 20) which consists of a spring-loaded closing device and a valve seat located to shut off the backflow path below a certain pressure limit, and with a back-pressure valve comprising a closing device and a valve seat, this closing device being removable from the valve seat by means of the working pressure, thus clearing the working flow path. In order to simplify the construction and to obtain a large cross-sectional passage area at a given external dimension of the valve housing, both flow paths are conducted via a common valve seat (18), and the closing device (20) can be moved away from the valve seat by means of working pressure which moves the closing device in the working flow direction (P) from its closing position (I), in which both flow paths are shut off, into a first open position (II), in which the closing device clears the working flow path, and furthermore, the closing device can be moved away from its closing position (I) to the backflow direction (L) by means of the backflow pressure, thus pushing it against the tension of a spring into a second open position (III) in which it clears the backflow path (B).
REFERENCES:
patent: 844003 (1907-02-01), Conrad
patent: 1087890 (1914-02-01), Rogers
patent: 2459326 (1949-01-01), Kremiller
patent: 2827283 (1958-03-01), Browne
patent: 3092137 (1963-06-01), Thieme
patent: 3411422 (1967-03-01), Oberthur
patent: 3483952 (1969-12-01), Cardwell
Heilmeier & Weinhlein Fabrik fur Oel-Hydraulik GmbH & Co. KG
Nilson Robert G.
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