Valve devices for use with mining equipment

Details Valve devices for use with mining equipment Valve devices for use with mining equipment

1989-02-27

1990-06-26

Taylor, Dennis L.

Hydraulic and earth engineering

Earth treatment or control

Ground stabilization or reinforcement

137494, 137508, 137509, E21D 2316, F16K 31122

Patent

active

049367145

ABSTRACT:
A pressure-relief valve device employs a connector welded to the base of mining equipment equipment such as an hydraulic prop, so as to communicate with the pressure fluid in a working chamber thereof. A housing is screwed into the connector and the connector has an outflow passage leading to the surroundings. A valve composed of a fixed valve seating and a movable closure member opens and closes communication between the working chamber and the outflow passage. A spring holds the valve closure member on the seating. The valve closure member is slidably guided on part of a tappet subjected to spring force. The tappet has a piston exposed to the pressure fluid which opposes the spring force. If excess pressure occurs the tappet moves against the spring force and lifts the closure member off the seating. Once the pressure drops the tappet moves back under the action of the spring but the closure member can move more slowly to gently re-establish the valve action.

REFERENCES:
patent: 3410304 (1968-11-01), Paul
patent: 4074695 (1978-02-01), Weirich et al.
patent: 4552488 (1985-11-01), Elliott-Moore
patent: 4572709 (1986-02-01), Weirich et al.
patent: 4580594 (1986-04-01), Petts
patent: 4716928 (1988-01-01), Kussel et al.

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