Other

Magyar Aluminiumipari Troszt

Kozponti Banyaszati Fejlesztesi Intezet

Skotchinsky Institut Gornogo Dela

Vladislav D Firstov

Ferenc Simon

Jozsef Korbuly

Vladimir N Khorin

Laszlo Mahig

Karoly Balazs

Juri G Shein

Boris N Kostjunin

Petr M Bronfen

Sergei A Sanin

Miklos Frcska

Laszlo Gal

Jury F Ponomarenko

Sandor Hlavay

Juri F Ponomarenko

Arnold M Ragutsky

Lajos Huber

The invention relates to a pressure limiting valve, mainly for hydraulic mine props, which has a working space with an inlet opening connected to a high-pressure space and an outlet opening connected to low-pressure space in the operative position of the valve, a displaceable first valve member engageable with a valve seat within this working space in the shut-off position of the valve, a spring pressing the first valve member to the valve seat and in a given case, a spring sustaining the valve seat, suitably a gas spring and in which according to the invention the first valve member has transfer passages ensuring communication between the inlet opening and the outlet opening in the open position of the valve, as well as second valve member provided with a frustoconical head facing the cover plate and having a stem loosely fitted in a guide bore formed in the first valve member which is formed with an annular axial flange surrounding the head of the second valve member which is concentrically arranged within this flange.

Pressure limiting valve, particularly for hydraulic mine props

The pressure valve is actuated by pressurized fluid and has a housing with a high-pressure space and a low-pressure space separated from each other by a partition. The partition has a bore accommodating a valve member. Axial passages are made in the body of the valve member for establishing alternating communication between the spaces upon the displacement of the valve member. The low-pressure space receives a pressure-relief valve spring-urged away from the partition and movable by the action of pressure selectively supplied to initiate relieving of the high-pressure space. The pressure-relief piston has an axial bore. The pressure valve incorporates an auxiliary piston in the axial bore of the pressure-relief piston and it cooperates with the valve member to displace the latter. The body of the valve member is provided with throttling passages communicating with the axial passages. The flow passage area of the throttling passages is substantially smaller than that of the axial passages, and the throttling passages are arranged so that during the high-pressure space pressure-relieving operation, the two spaces communicate via the throttling passages until the effort applied to the valve member by the auxiliary piston overcomes the effort applied to this valve member from the high-pressure chamber.

Pressure valve

Growing community of inventors

Moscow, Russia

Vladislav D Firstov