４．Operation - Yoshitake DP-10 Series Instruction Manual

４．Operation
* The structure differs slightly for DP-12/14/16/18/12D/14D/16D/18D.
（１） Operation
When the power is turned ON, the coil① is magnetized and the plunger③ is sucked
up, thereby open the pilot valve④. The pressure at the upper part of the valve
(diaphragm)⑧ flows to the outlet side via pilot port⑤, causing a pressure drop. The
valve (diaphragm)⑧ is then pushed up by the inlet pressure, and the valve is opened.
（２） Closing operation
When the power is turned OFF, the plunger③ is pushed down by a pin/kick spring②
and dead weight, thereby close the pilot valve④. The inlet pressure is introduced
through the bleed port⑦ to upper part of the valve (diaphragm)⑧, thereby equalize
the inlet pressure. The valve (diaphragm)⑧ is then pushed down and closed by the
pin/kick spring② and the valve spring⑥.
DP-10/13/15/17
DP-10D/13D/15D/17D
-4-
*
■EPDT-028d■