The valve is a metallic seal 3/3 way – seat valve. The opening and closing takes place by means of a hydraulic actuated set piston.
After switching on the hydraulic and electric supply the set piston moves into the normal-position of the valve. No pressure increasing takes place. A to T open!
The set piston moves to the right site and closes the R-Medium return line and opens the P-Medium Inlet. The pressure increasing takes place. T-Medium Return
The set piston moves to the left site and closes the G-Medium Inlet and opens the R-Medium Return. The pressure decreasing takes place. T-Medium Return - from A to T!