Yoshitake DP-100 Series Product Manual page 6

Normally open type (DP-100-C and DP-100F-C)
（1）Opening operation (Power OFF)
When the power is turned OFF, the coil [1] excitation is canceled and the pilot valve [4] and plunger [2]
are lifted up by force of the lift spring [3], to open the pilot valve [4]. The pressure at the upper part of the
valve [7] drops due to the outgoing pressure toward the outlet through the pilot port [5]. This makes the
valve [7] lifted up to opened position by the inlet pressure.
（2）Closing operation (Power ON)
When the power is turned ON, the coil [1] is excited and pulls down the plunger [2], 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 attractive force of the plunger
[2], this makes the valve [7] pushed down to closed position.
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■EPDT-247i■