Valve device
A control valve device ( 1 ) for the control of a consumer ( 2 ), in particular of a dual-action consumer, includes a control valve ( 3 ) that controls the connection of an admission side of the consumer ( 2 ) with a pump and a return side of the consumer ( 2 ) with a reservoir. The control valve device ( 1 ) has a regeneration function by means of which the return side of the consumer ( 2 ) can be connected with the admission side of the consumer ( 2 ). The regeneration function has a short circuit device ( 10 ) located between the consumer ( 2 ) and the control valve ( 3 ) and provides a connection of the return side of the consumer ( 2 ) with the admission side of the consumer ( 2 ). For the regeneration function, the connection of the return side of the consumer ( 2 ) with the reservoir can be shut off by the control valve ( 3 ).
1. A control valve device for the control of a dual-action consumer, comprising:
a control valve that controls a connection of an admission side of a consumer with a pump and a return side of the consumer with a reservoir;
a regeneration function by means of which the return side of the consumer is selectively connected with the admission side of the consumer, wherein the regeneration function comprises a short circuit device located between the consumer and the control valve and makes possible a connection of the return side of the consumer with the admission side of the consumer, wherein the connection of the return side of the consumer with the reservoir is selectively blocked by the control valve for the regeneration function; and
a brake valve device associated with the return side of the consumer, wherein the short circuit device is located between the brake valve device and the control valve.
2. The control valve device of claim 1 , wherein the control valve includes a regeneration position in which the admission side of the consumer is in connection with the pump and the connection of the return side of the consumer with the reservoir is shut off.
3. The control valve device of claim 2 , wherein the control valve is selectively actuated by a control signal toward a normal position that connects the admission side of the consumer with the pump and the return side of the consumer with the reservoir, and wherein the control valve is selectively actuated by an increasing control signal from the normal position toward the regeneration position.
4. The control valve device of claim 1 , wherein the short circuit device comprises a short circuit valve having a shutoff position and an open position, and is selectively actuated into the open position for the regeneration function.
5. The control valve device of claim 4 , wherein for the regeneration function, the short circuit valve is selectively actuated into the open position by the control signal that actuates the control valve toward a regeneration position.
6. The control valve device of claim 1 , wherein connected to the control valve is a first pressure fluid line that is in communication with the admission side of the consumer, and a second pressure fluid line that is in communication with the return side of the consumer, and wherein the short circuit device is located in a pressure fluid line that connects the first pressure fluid line with the second pressure fluid line.
7. The control valve device of claim 1 , wherein the short circuit device is located on the consumer.
8. The control valve device of claim 1 , wherein to protect the return side of the consumer, a pressure limiting device is located between the brake valve device and the consumer.
9. The control valve device of claim 1 , wherein the consumer is a stick cylinder of an excavator.
10. A control valve device for the control of a dual-action consumer, comprising:
a control valve that controls a connection of an admission side of a consumer with a pump and a return side of the consumer with a reservoir; and
a regeneration function by means of which the return side of the consumer is selectively connected with the admission side of the consumer, wherein the regeneration function comprises a short circuit device located between the consumer and the control valve and makes possible a connection of the return side of the consumer with the admission side of the consumer, wherein the connection of the return side of the consumer with the reservoir is selectively blocked by the control valve for the regeneration function, wherein the short circuit device comprises a short circuit valve having a shutoff position and an open position and is selectively actuated into the open position for the regeneration function, and
wherein the short circuit valve comprises a seat valve that opens toward the admission side of the consumer.
11. The control valve device of claim 10 , wherein the seat valve comprises a spring-loaded check valve which is selectively actuated into the open position by the control signal that actuates the control valve toward the regeneration position.
12. The control valve device of claim 11 , wherein the regeneration function is selectively overridden as a function of the admission pressure that is available on the admission side of the consumer.
13. The control valve device of claim 12 , wherein the control valve is selectively actuated from the regeneration position toward the normal position by an admission pressure that is available on the admission side of the consumer.
14. The control valve device of claim 13 , wherein the control valve includes a control surface that counteracts the control signal and is in communication with the admission side of the consumer.
15. The control valve device of claim 13 , wherein the control signal that actuates the control valve is selectively reduced as a function of the admission pressure.