Prop control valve

Details Prop control valve Prop control valve

1986-10-16

1987-09-22

Weakley, Harold W.

Motors: expansible chamber type

Relatively movable working members with one having motive...

251 63, 251 635, F01B 100

Patent

active

046947302

ABSTRACT:
The control valve for the re-setting of the props at a predetermined minimum setting pressure is connected at respective junctions to a high pressure conduit, to the pressure chambers of the props, to the prop-setting conduit and to the return-flow conduit leading to the annular chambers of the props. The spring-loaded closure body is guided displaceably in the valve housing by journals on each of the two sides of the valve cone. The ends of the journals are formed as actuation faces. The valve cone seals off the high pressure junction and the junctions leading to the pressure chambers of the prop and opens only when a predetermined minimum setting pressure at the junction is exceeded. For closure, the control valve is loaded through the junction on the actuation area of the journal with the pressure fluid conducted to the annular chambers of the props.

REFERENCES:
patent: 1516011 (1924-11-01), Heath
patent: 3240466 (1966-03-01), Meyer
patent: 4040600 (1977-08-01), Coppola
patent: 4267861 (1981-05-01), Roth

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