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US 5,462,076 AGranted
Pressure-compensated pressure limiting valve
AssigneeRichard Voss Grubenausbau GmbH
InventorRichard Voss
Life of this patent
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AssigneeRichard Voss Grubenausbau GmbH
InventorRichard Voss
Estimating the term…
Pressure limiting valves intended for use in underground mining and tunnel construction are able to release the pressure medium discharged if an overload occurs without problems into the return line, since the occurring back pressure is directly neutralized in the pressure limiting valve. For this purpose a discharge of the pressure medium is provided even before the spring chamber, for which purpose the crossbores arranged there are constructed in such a way that they expand, forming a water chamber with increased volume. This water chamber is located in ring form around the valve piston that is exposed in this area and is connected via return bores to the return line. The water chamber with accordingly large volume makes it possible that the back pressure acts simultaneously on the spring and the valve piston, so that the described neutralization takes place.
Pressure limiting valve for hydraulic support in underground mining and tunnel construction, comprising a tubular valve housing, a valve piston that is movable in a guide against force of a valve spring arranged and adjustable inside a spring chamber connected to the valve housing, and a water chamber constructed in the valve housing in front of the spring chamber for spraying off pressure medium through the water chamber when the valve piston responds, while bypassing the spring chamber, the water chamber extending in ring form around the valve piston that is exposed in this area, water chamber return bores leading from the water chamber to an exterior mantle and sealing rings for enabling a water-tight connection of a return line.
Pressure limiting valve for hydraulic support in underground mining and tunnel construction, comprising a tubular valve housing, a valve piston that is movable in a guide against force of a valve spring arranged and adjustable inside a spring chamber connected to the valve housing, and a water chamber constructed in the valve housing in front of the spring chamber for spraying off pressure medium through the water chamber when the valve piston responds, while bypassing the spring chamber, the water chamber extending in ring form around the valve piston that is exposed in this area, water chamber return bores leading from the water chamber to an exterior mantle and sealing rings for enabling a water-tight connection of a return line, wherein the valve piston comprises a main piston which has a blind bore, radial bores and a spring piston with no bores that is inserted on a head side into a spring plate, said spring piston being disposed in a valve bore between the spring chamber and the water chamber, a sealing ring between the spring piston and the valve bore and an O-ring between the main piston and the guide.
A pressure limiting valve for hydraulic supports in underground mining and tunnel construction comprising a tubular valve housing, a spring chamber mounted in the housing, a valve spring adjustably mounted in the spring chamber, a valve piston mounted in the housing, said valve piston being movable in response to fluid pressure, a water chamber formed in the valve housing in front of the spring chamber for spraying off a pressure medium and bypassing the spring chamber in response to a movement of the valve, the water chamber being coaxial with the valve piston and surrounding the valve piston, and wherein the valve piston is exposed in an area of the water
A pressure limiting valve for hydraulic supports in underground mining and tunnel construction comprising a tubular valve housing, a spring chamber mounted in the housing, a valve spring adjustably mounted in the spring chamber, a valve piston mounted in the housing, said valve piston being movable in response to fluid pressure, a water chamber formed in the valve housing in front of the spring chamber for spraying off a pressure medium and bypassing the spring chamber in response to a movement of the valve, the water chamber being coaxial with the valve piston and surrounding the valve piston, and wherein the valve piston is exposed in an area of the water chamber, and plural return bores extending from the water chamber, ends of the plural return bores being surrounded by sealing rings for forming a connection with a return line connected to the return bores, wherein the valve piston comprises a main piston and a spring piston, the main piston having a blind bore and plural radial bores, the main piston and the radial bores being driven over an O-ring by excess pressure in the blind bore for communicating the excess pressure from the blind bore through the radial bores to the water chamber, the spring piston abutting a spring plate on one end of the spring within the valve housing, the spring piston being mounted within a valve bore above the water chamber and spring chamber and being sealed by a sealing ring in the valve bore. chamber, and plural return bores extending from the water chamber, ends of the plural return bores being surrounded by sealing rings for forming a connection with a return line connected to the return bores.
Dependencies are inferred from the claim text.