Valve for hydraulic props of shield-type support frames, and...

Details Valve for hydraulic props of shield-type support frames, and... Valve for hydraulic props of shield-type support frames, and...

2004-05-05

2008-09-30

Lopez, F. Daniel (Department: 3745)

Motors: expansible chamber type

Plural relatively movable or rigidly interconnected working...

C091S420000, C405S302000

Reexamination Certificate

active

07428861

ABSTRACT:
The invention relates to a valve120, especially a check valve, for hydraulic plungers (3) of shield-type support frames in underground mining with a valve housing121and a switchable valve insert received therein, connections126-129for high pressure lines connected to the cylinder chamber and/or the annular space of the hydraulic cylinder3, and at least one connection30for an additional unit such as a pressure relief valve, a pressure sensor, and/or a pressure display. The valve housing121can be mounted to the hydraulic cylinder3, and in the mounting stage, the connections125-129on the valve housing121extend axially parallel to the axis of the hydraulic plunger3. According to an advantageous further embodiment, the valve housing can be provided with at least one fastening means for an extension housing40that can be mounted in a releasable manner to at least one side wall22B thereof for additional hydraulic functions of the shield-type support frame (see FIG.2).

REFERENCES:
patent: 3673800 (1972-07-01), Ashton
patent: 4470339 (1984-09-01), Tardy
patent: 5000622 (1991-03-01), Block
patent: 3504553 (1986-04-01), None
patent: 19633258 (1997-08-01), None
patent: 19813909 (1999-10-01), None
patent: 20301251 (2003-04-01), None
patent: 0930130 (1999-07-01), None

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