-3-
■EPDT-310■
4. Operation
1. Closing operation (normal state)
When pilot pressure is not applied, valve disc [5] is closed by power of spring [26].
2. Opening operation
When pilot pressure is applied from pilot port, pressure is added to bottom part of piston
[23], and overcome load of spring [26] and push up piston [23] and open valve disc [5]. Also,
position indicator [27] connected to piston [23] is pushed up at the same time, then valve
opening can be checked from outside visually.
Pilot port
Pilot port
⑤
26
⑤
23
26
27
Fig.2
Fig.3
