Patent ID: 8833391
Filing Date: 2014-09-16
Classification: F15B,Y10T

Abstract:
1. Valve arrangement for controlling a fluid consumer, which valve arrangement is arranged for selectively connecting a source of fluid pressure to the consumer in order to actuate the consumer in a predetermined direction, the valve arrangement comprising: a pressure controlled valve comprising a first valve port connected to the source of fluid pressure, a second valve port connected to a first chamber of the consumer, a valve cone slidably movable in a cavity in a valve body between a first position in which a connection between the first and second valve ports is closed by a first side of the valve cone, and a second position in which the connection between the first and second valve ports is open, said cone being urged to its closed position by fluid pressure acting on an opposite second side of the valve cone which second side forms a space with the valve body, means for passing fluid under pressure through the valve cone from the first and second valve ports to said space through passages each containing a non-return valve, and controllable valve means comprising a first pilot valve in a conduit connecting said space with the first valve port and a second pilot valve in a conduit connecting said space with the second valve port, which controllable valve means prevents the valve cone from opening if the pressure in one of the first and second valve ports intended to be an input port is lower than the pressure in the other of the first and second valve ports intended to be an output port.