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Opening operation
IN
（1）Opening operation (Power ON)
When the power is turned ON, the coil [1] is excited and pulls up the plunger [2], to open the pilot valve [4].
Next, the pressure at the upper part of the diaphragm [7] drops since it flows to the outlet through the pilot
port [5]. The diaphragm [7] is then lifted up to open position by the inlet pressure.
（2）Closing operation (Power OFF)
When the power is turned OFF, the coil [1] excitation is canceled and the plunger [2] drops down by force
of the kick spring [3], to close the pilot valve [4]. The pressure at the upper part of the diaphragm [7] rises
due to the incoming inlet pressure from the bleed port [6] which is communicated with the inlet. With the
support of the kick spring [3], this makes the diaphragm [7] pushed down to closed position.
4. Operation
[1] Coil
[2] Plunger
[3] Kick spring
[4] Pilot valve
[5] Pilot port
[6] Bleed port
[7] Diaphragm
IN
5
Closing operation
■EPDT-266c■
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