Hydraulic valve
A hydraulic valve includes a valve housing, a valve cone, a spring housing, a check valve, a first hydraulic connection and a second hydraulic connection. The valve housing has a valve seat and the valve cone is movable in the valve housing between a closed position and an open position. In the closed position, the valve cone is in contact with the valve seat and blocks a first flow path between the first and the second hydraulic connection. In the open position, the valve cone is lifted off the valve seat and the first flow path is opened. A spring element is disposed in the spring housing, which biases the valve cone into the closed position. The check valve is disposed in the valve cone and opens a second flow path from the second hydraulic connection to the first hydraulic connection when pressure is applied to the second hydraulic connection.
1. A hydraulic valve, comprising:
a valve housing;
a valve cone;
a spring housing;
a check valve;
a first hydraulic connection; and
a second hydraulic connection,
wherein the valve housing comprises a valve seat,
wherein the valve cone is movably disposed in the valve housing between a closed position and an open position,
wherein the valve cone abuts the valve seat in the closed position and blocks a first flow path between the first hydraulic connection and the second hydraulic connection,
wherein the valve cone is lifted off the valve seat in the open position and opens the first flow path from the first hydraulic connection to the second hydraulic connection,
wherein a spring element is disposed in the spring housing,
wherein the spring element biases the valve cone into the closed position, and
wherein the check valve is disposed in the valve cone and, when pressure is applied to the second hydraulic connection, opens a second flow path from the second hydraulic connection to the first hydraulic connection,
wherein the valve cone has a fluid guide passing through the valve cone upstream of the check valve as viewed in the direction of flow from the second hydraulic connection to the first hydraulic connection, the fluid guide being part of the first and/or the second flow path.
2. The hydraulic valve according to claim 1 , wherein the spring housing includes the second hydraulic connection.
3. The hydraulic valve according to claim 1 , wherein the valve cone has an axially extending receiving space, the fluid guide comprising at least one bore extending from the outer surface of the valve cone to the receiving space.
4. The hydraulic valve according to claim 3 , wherein the check valve is disposed in the receiving space.
5. The hydraulic valve according to claim 3 , wherein the fluid guide includes a plurality of bores.
6. The hydraulic valve according to claim 1 , wherein the valve housing comprises a fluid chamber, the fluid chamber being part of the first flow path, and the fluid guide opens into the fluid chamber at least in the open position of the valve cone.
7. The hydraulic valve according to claim 6 , wherein the valve housing has an axial bore with an inner circumferential surface for receiving the valve cone, the fluid chamber being formed by an at least partially circumferential recess on the inner circumferential surface of the axial bore.
8. The hydraulic valve according to claim 1 , wherein the valve cone has a spring housing end facing the spring housing, the valve cone being guided in the valve housing between the spring housing end and the fluid guide.
9. The hydraulic valve according to claim 1 , wherein the hydraulic valve has a spring plate disposed in the spring housing, the spring plate has an axial passage, and the valve cone abuts against the spring plate.
10. The hydraulic valve according to claim 1 , wherein the hydraulic valve has a third hydraulic connection, wherein a control pressure is applicable to the third hydraulic connection in order to move the valve cone into the open position counter to a force of the spring element, the hydraulic valve having a control piston acting on the valve cone, wherein pressure to the control piston is applicable via the third hydraulic connection.
11. The hydraulic valve according to claim 1 , wherein the hydraulic valve is a load holding valve.
12. A hydraulic valve, comprising:
a valve housing;
a valve cone;
a spring housing;
a check valve;
a first hydraulic connection; and
a second hydraulic connection,
wherein the valve housing comprises a valve seat,
wherein the valve cone is movably disposed in the valve housing between a closed position and an open position,
wherein the valve cone abuts the valve seat in the closed position and blocks a first flow path between the first hydraulic connection and the second hydraulic connection,
wherein the valve cone is lifted off the valve seat in the open position and opens the first flow path from the first hydraulic connection to the second hydraulic connection,
wherein a spring element is disposed in the spring housing, the spring element biasing the valve cone into the closed position,
wherein the check valve is disposed in the valve cone and, when pressure is applied to the second hydraulic connection, opens a second flow path from the second hydraulic connection to the first hydraulic connection,
wherein the spring housing comprises the second hydraulic connection, an external thread for screwing the hydraulic valve into a block, and a sealing member disposed on the outer periphery of the spring housing,
wherein the sealing member is disposed in axial direction between the external thread and the valve housing.
13. The hydraulic valve according to claim 12 , wherein the valve cone has a fluid guide passing through the valve cone upstream of the check valve as viewed in the direction of flow from the second hydraulic connection to the first hydraulic connection, the fluid guide being part of the first and/or the second flow path.
14. The hydraulic valve according to claim 12 , wherein the hydraulic valve is a load holding valve.