Manipulating valve, in particular for a time release of a locking device in rope cranes

摘要

The manipulating valve is part of a time release of a locking device of a rope crane. The intention is to avoid having to change direction with the rope crane in order to be able to release the locking mechanism. The time release is to operate independently of external sources of energy. During the travel of the rope crane, the fluid (3) under pressure forces the piston (7) of the manipulating valve (6) against the pressure of a spring (8) down into a first position and allows the connection (9) to the pump and the connection (10) to the consumer to communicate with one another. In the process, the locking mechanism of the rope crane is out of operation. When the rope crane is stopped by means of a pull rope, the pump is no longer driven. Via a leakage point (17) at the valve piston (7), fluid (3) flows from the consumer via the valve inlet (18) to the reserve tank. The pressure in the cylinder (22) decreases and the piston (7) is moved up by the spring (8) into a second position. The flow of the fluid (3) from the consumer to the return thereby increases. The locking device of the rope crane is released. <IMAGE>