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US 2019/0162319 A1Published application
Device for flow force compensation
AssigneeHydac Fluidtechnik GmbH
InventorsFrank SCHULZ, Peter BRUCK
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AssigneeHydac Fluidtechnik GmbH
InventorsFrank SCHULZ, Peter BRUCK
Estimating the term…
A device, consisting of at least one control piston (12) which is longitudinally displaceable in a housing (10) comprising at least two connection points (P, A) for fluid, and which cooperates with a metering edge (34) of the housing (10) at a connection point (P), said point, in control positions of the control piston (12), supplying the other connection point (A) with fluid via a fluid connection, and which piston, as a result of occurring flow forces, tends to be drawn in the direction of a closing position which blocks one of these fluid connections. The device is characterized in that in order to compensate the flow force, the control piston (12) has, in the region of the control edge (34) of the housing (10), a shape modification (48) of its cylindrical exterior basic form (50), such that a flow contact surface (52) for fluid is created, which surface transfers a compensating force that acts against the flow force to the control piston (12) and that seeks to pull the control piston (12) into an opening position opposed to the closing position.
A device comprising at least one regulating piston (12), which is guided longitudinally movably in a housing (10) having at least two ports (P, A) for fluid, and interacting with a control edge (34) of the housing (10) at a port (P), which supplies the other port (A) in regulating positions of the regulating piston (12) with fluid via a fluid connection and thereby aims at pulling [the piston] towards a closed position blocking this fluid connection due to occurring flow forces, characterized in that the regulating piston (12) shows a change in shape (48) from its basically cylindrical outer shape (50) in the area of the control edge (34) of the housing (10) for a flow force compensation such that an effective flow surface (52) for fluid is provided, which causes a compensating force acting against the flow force to be introduced into the regulating piston (12), which force aims at pulling the regulating piston (12) into an opening position opposite to the blocked position.
Dependencies are inferred from the claim text.