Hydraulically-controlled non-return valve

Details Hydraulically-controlled non-return valve Hydraulically-controlled non-return valve

1985-03-01

1986-07-01

Rosenthal, Arnold

Valves and valve actuation

Fluid actuated or retarded

Piston type expansible chamber reciprocating valve actuator

91420, 137493, 251 25, F16K 31124, F15B 13042

Patent

active

045975574

ABSTRACT:
An hydraulically-controlled non-return valve for the hydraulic cylinders of a walking mine-roof support is provided with a cylindrical valve-closing member which is spring-loaded in the closing direction and is guided in a valve case in a valve housing, the valve-closing member being sealed off therein by means of a seal. A space on one face of the valve-closing member is connected to a circulating duct by way of a stepped bore in the valve case, which bore contains a spring-loaded throttle member having through-flow bores of which one has a throttle-like reduced cross-section. During setting of the hydraulic cylinder pressurized fluid flows past the opened valve-closing member through inclined bores and, by way of the circulating duct, to the stroke space of the hydraulic cylinder. During retraction of the hydraulic cylinder, a control piston in the non-return valve is loaded at the same time as an annular space in the hydraulic cylinder. The control piston thus lifts the valve-closing member from a valve seat so that the pressurized fluid flows back in the reverse direction. The said space bounding the valve-closing member is connected to the throttle member in such a manner that the valve-closing member is not caused to oscillate by the pressurized fluid flowing back during retraction of the hydraulic cylinder.

REFERENCES:
patent: 4006663 (1977-02-01), Baatrup et al.
patent: 4076210 (1978-02-01), Spielvogel
patent: 4323092 (1982-04-01), Acerbi
patent: 4461449 (1984-07-01), Turner

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