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US 2011/0297856 A1Published application
Proportional pressure control valve
AssigneeHydac Fluidtechnik GmbH
InventorsMarkus Bill, Peter Bruck, Gerd Schneider
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AssigneeHydac Fluidtechnik GmbH
InventorsMarkus Bill, Peter Bruck, Gerd Schneider
Estimating the term…
The invention relates to a proportional pressure control valve comprising a valve box (10) which has at least three fluid-carrying connections, especially in the form of a pump (P), a user (A) and a reservoir (T) connection, a control piston (18) being guided in a longitudinally displaceable manner inside the valve box (10) for optionally connecting the pump connection (P) to the user connection (A) and the user connection (A) to the reservoir connection (T). A fluid-carrying connection is established between the pump connection (P) and a pilot chamber (20) of a pilot valve (22), the pilot valve (22) being controlled by a magnet system, especially a proportional magnet system (28). The proportional pressure control valve according to the invention is characterized in that the fluid-carrying connection to the pilot chamber (20) has a bore (27) that runs axially inside the wall of the valve box (10) and extends from a radial bore (9) of the housing (10) forming the pump connection (P).
A proportional pressure control valve comprising a valve housing (10) which has at least three fluid-conducting connections, particularly in the form of a pump (P) connection, a user (A) connection, and a tank (T) connection, a control piston (18) being guided to be able to move lengthwise within the valve housing (10) for selective connection of the pump connection (P) to the user connection (A) and of the user connection (A) to the tank connection (T), with there being a fluid-conducting connection between the pump connection (P) and a pilot chamber (20) of a pilot valve (22), and the pilot valve (22) being controllable by a magnet system, in particular a proportional magnet system (28), characterized in that the fluid-conducting connection to the pilot chamber (20) has a bore (27) which runs in the axial direction within the wall of the valve housing (10) and which emerges from a radial bore (9) of the housing (10) which forms the pump connection (P).
Dependencies are inferred from the claim text.