4
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EPDT-247i
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4. Operation
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Normally closed type (DP-100, DP-100F, DP-100-D and DP-100F-D)
（
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 valve [7] drops since it flows to the outlet through the pilot port
[5]. The valve [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 valve [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 valve [7] pushed down to closed position.
