Multi-stage switchable pilot-controlled valve arrangement
A technology of pilot control and valve device, which is applied in the direction of valve device, control valve, air release valve, valve operation/release device, etc., which can solve the problems of large volume and high cost of pipeline installation, and improve the safety of the device and improve Safety, compact effect
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[0019] According to the illustration, the valve housing 1 (the region of the valve mechanism is only partially shown here) has a pressure supply connection 2 and a working line connection 3 . The valve mechanism has a normally closed 2 / 2 valve function, which is generated by the seat valve. The seat valve comprises a valve seat 4 fastened to the housing, which can be moved from the fully closed valve shown here by means of a coaxially extending and axially displaceable tappet 6 with its associated shut-off element 5 according to the pneumatic pilot control. The valve position passes over the throttled intermediate valve position into the open valve position. The valve return spring 7 , which is likewise integrated in the valve housing 1 , holds the shut-off element 5 of the seat valve in the closed control position during pressure-free pilot control.
[0020] The pneumatic pilot control consists of a first control piston 8 located in a first control chamber 9 formed in the va...
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