|국가/구분||United States(US) Patent 등록|
|미국특허분류(USC)||91/170MP ; 251/63 ; 251/635|
|발명자 / 주소|
|출원인 / 주소|
|인용정보||피인용 횟수 : 8 인용 특허 : 2|
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 ...
In combination, a control valve and prop conduits associated with the pressure chambers of the hydraulic props of a walking mine roof support assembly comprising: a generally cylindrical valve housing, an elongate valve closure body arranged for longitudinal movement in the valve housing, a valve cone on an intermediate portion of the valve closure body, an annular valve seating arranged in the valve housing to be sealingly engaged by the valve cone with the valve closure body extending through the valve seating, a high pressure supply connected to said ...