Control valve for controlling pressure-medium flows comprising an integrated check valve

A control valve for controlling pressure medium flows, comprising:

• a valve housing having a hollow construction and having at least one feed connection (P), at least two working connections (A, B), and at least one discharge connection (T1, T2),
• a control piston guided displaceably inside the valve housing, by which, dependent on position, the feed connection (P) is connectable via at least one first pressure medium line to one or the other of the working connections (A, B), while the respective other one of the working connections (B, A) is connected via at least one second pressure medium line to the discharge connection (T1, T2), the control piston having a piston cavity and the first pressure medium line comprising a feed opening allocated to the feed connection (P) and comprising a discharge opening allocated to the working connections (A, B), each opening into the piston cavity,
• at least one check valve that is hydraulically openable and that releases the first pressure medium line in a feed direction, having a closing part that has a sealing surface, by which at least one of the valve openings can be sealed,
• the closing part is resiliently supported via at least one spring tongue, the sealing surface of said closing part being movable through elastic deformation of the spring tongue into a closed position in which the spring tongue lies tightly against the valve opening and an open position in which the valve opening is completely open, and one of the openings of the control piston acts as valve opening, and
• the closing part is located in the piston cavity, and the feed opening of the control piston acts as the valve opening.

A control valve for controlling pressure medium flows, comprising:

• a valve housing having a hollow construction and having at least one feed connection (P), at least two working connections (A, B), and at least one discharge connection (T1, T2),
• a control piston guided displaceably inside the valve housing, by which, dependent on position, the feed connection (P) is connectable via at least one first pressure medium line to one or the other of the working connections (A, B), while the respective other of the working connections (B, A) is connected via at least one second pressure medium line to the discharge connection (T1, T2), the control piston having a piston cavity and the first pressure medium line comprising a feed opening allocated to the feed connection (P) and comprising a discharge opening allocated to the working connections (A, B), each opening into the piston cavity,
• at least one check valve that is hydraulically openable and that releases the first pressure medium line in a feed direction, having a closing part that has a sealing surface, by which at least one of the valve openings can be sealed,
• the closing part is elastically deformable and the sealing surface is movable through elastic deformation of the closing part into a closed position in which the sealing surface lies tightly against the valve opening and an open position in which the valve opening is completely open, and one of the openings of the control piston acts as the valve opening, and
• the closing part is located on an outer casing surface of the control piston, and the discharge opening of the control piston acts as the valve opening.

A control valve for controlling pressure medium flows, comprising:

• a valve housing having a hollow construction and having at least one feed connection (P), at least two working connections (A, B), and at least one discharge connection (T1, T2),
• a control piston guided displaceably inside the valve housing, by which, dependent on position, the feed connection (P) is connectable via at least one first pressure medium line to one or the other of the working connections (A, B), while the respective other one of the working connections (B, A) is connected via at least one second pressure medium line to the discharge connection (T1, T2), the control piston having a piston cavity and the first pressure medium line comprising a feed opening allocated to the feed connection (P) and comprising a discharge opening allocated to the working connections (A, B), each opening into the piston cavity,
• at least one check valve that is hydraulically openable and that releases the first pressure medium line in a feed direction, having a closing part that has a sealing surface, by which at least one of the valve openings can be sealed,
• the closing part is resiliently supported via at least one spring tongue, the sealing surface of said closing part being movable through elastic deformation of the spring tongue into a closed position in which the spring tongue lies tightly against the valve opening and an open position in which the valve opening is completely open, and one of the openings of the control piston acts as valve opening, and
• the closing part is located on an outer casing surface of the control piston, and the discharge opening of the control piston acts as the valve opening.