PRELIMINARY CONTROL VALVE IN PARTICULAR FOR USE IN MINING HYDRAULIC SYSTEMS

• Main Authors: PETERS BERND, DETTMERS MICHAEL
• Format: Patent
• Language: English
• Published: 07.03.1994
• Edition: 5
• Subjects: ACTUATING-FLOATS; BLASTING; COCKS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR; DEVICES FOR VENTING OR AERATING; ENGINEERING ELEMENTS AND UNITS; FLUID-PRESSURE ACTUATORS; FLUID-PRESSURE ACTUATORS, e.g. SERVO-MOTORS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; HYDRAULICS OR PNEUMATICS IN GENERAL; LIGHTING; MECHANICAL ENGINEERING; SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; TAPS; THERMAL INSULATION IN GENERAL; VALVES; WEAPONS

A valve device for use in an electro-hydraulic mining control system employs a cuboidal housing composed of two separate sub-housings. One sub-housing block has bores containing valve assemblies with cartridges which can be inserted into or withdrawn from the bores via an exterior face. Each cartridge is made up of two elongate sleeve components in screw-threaded engagement. The sleeve components define valve seatings and closure elements are guided in the components and engage on the seatings. A rod couples the closure elements so that when one closure element is on its seating the other is off its seating and vice versa. The closure elements are biased with a spring contained in a bushing fitted into the bore via the exterior face. The bushing is used to rotate the sleeve components relative to one another to adjust the relative position of the valve seatings. At the end of the cartridges remote from the exterior face the other sub-housing plate supports pivotable levers moved by electro-magnetic power to displace the valve closure elements against the spring force. The sub-housing block has internal bores acting as hydraulic connections for the valves and these bores all lead to openings in the same exterior face.