Method for increasing pressure in working cylinder has a smaller inner piston to further compress the fluid and achieve a working pressure greater than the pump pressure
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Pressure limiting valve, comprises a valve chamber containing a spring, a spring plate, a valve piston that moves in a guide, and a seal
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Pressure and flow control valve
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Hydraulic prop comprises ring grooves or connector grooves which are located at joints between the outer and inner pipes and respectively the foot plate and the prop head, and accommodate locking wires
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Manually-placed and -operated hydraulic prop, used in mining and tunnel construction, includes combined valve assembly in head plate
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Non-return valve for hydraulic coal mining equipment comprises casing with several connections connected by central bore containing spring-loaded valve piston and control piston connected by control slide
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Lost support for mining and tunnel construction
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Unlockable check valve with connection
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Valve assembly for underground hydraulic systems for mining and tunneling equipment has a filter which separates and retains dirt carried in the hydraulic fluid to be removed for disposal
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Pressure control valve has piston, housing, spring, pressure equalizing chamber, blind holes, valve tappet and extension part
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Spring plunger valve for use in tunneling and mining operations has second larger diameter valve preventing self-inflicted damage
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High pressure setting gun
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Removal stamp with a pressure fluid film between the outer wall of the piston and the inner wall of the outer stamp
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Ram for prop and roadway support for underground mining and tunnelling
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Rotary valve
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Removal stamp with integrated valve sleeve for a pressure relief valve
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Removal stamp for underground use with integrated pressure relief valve
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Control block with pressure-compensated pressure-relief valve and protected return line
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Filling and robbery valve with liquid return for the single plunger expansion used in underground mining and tunneling
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Pressure relief valve for hydraulic expansion in underground mining and tunneling
