Magyar Aluminiumipari Troszt

Kozponti Banyaszati Fejlesztesi Intezet

Mta Számítástechnikai És Automatizálási Kutató Intézet

Skotchinsky Institut Gornogo Dela

Karoly Balazs

Ferenc Simon

Andras Podmaniczky

Laszlo Mahig

Jozsef Korbuly

Szabolcs Tokes

Vladislav D Firstov

Endre Polya

Juri G Shein

Peter Vadasz

Miklos Frcska

Laszlo Gal

Attila L Markus

Sandor Hlavay

Juri F Ponomarenko

Andras Taller

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

A laser-operated apparatus for data and signaling recording makes use of a laser-beam source whose laser beam is directed at the Bragg angle into a tellurium dioxide monocrystal provided with an array of ultrasonic transducers, each of which is energized independently by at least one amplitude modulated very high frequency carrier. The individual transducer segments generate respective beams within the body of the crystal which, upon emerging, represent individual information channels which are separately controllable to provide the data and information recordal.

Laser-operated apparatus for data and signal recording

Growing community of inventors

Budapest, Hungary

Karoly Balazs