초록 ▼

The invention relates to a valve system for supplying fluid from a pair of fluid pressure sources to a load. A feed valve is provided which feeds－when required－a partial flow of the second fluid pressure source into the feed line of the load which is connected to the first fluid pressure source thro

The invention relates to a valve system for supplying fluid from a pair of fluid pressure sources to a load. A feed valve is provided which feeds－when required－a partial flow of the second fluid pressure source into the feed line of the load which is connected to the first fluid pressure source through a directional control valve. The feed valve comprises a pressure-compensating valve to control the volume of the partial flow and a switching valve to automatically open the pressure-compensating valve when required.

대표청구항 ▼

A valve system for supplying fluid from a first fluid pressure source to a load and a second pressure source to the load when required, comprising a directional control valve controlling the fluid path between said first fluid pressure source, a reservoir and said load and a feed valve provided betw

A valve system for supplying fluid from a first fluid pressure source to a load and a second pressure source to the load when required, comprising a directional control valve controlling the fluid path between said first fluid pressure source, a reservoir and said load and a feed valve provided between said directional control valve and said second fluid pressure source, characterized in that said feed valve comprises a flow control valve and a switch valve for controlling the control piston of the flow control valve said control piston being biased towards closing by the pressure of said second pressure source and spring-biased toward opening by a spring, said switch valve being moveable between a feed position in which said control piston is pressure-relieved towards closing and that the switch valve is actuated in response to supplying the load with pressurized fluid from said first pressure source and a pressure control position wherein pressure is supplied at a controlled value to said load from said second fluid pressure sources through a feed line, and an orifice is provided in said feed line, the control piston of said flow control valve being biased toward closing by the pressure upstream of said orifice and towards opening by the pressure downstream of said orifice.