-5-
■
EPDT-318a
■
4. Structure
5. Operation
This product is a reverse-operated, and valve opens by the air pressure increased in
the diaphragm case. Operated air pressure passes through the air connection port of
the bottom diaphragm case”26”, and by increasing air pressure on the diaphragm and
the diaphragm follower”30”, the spring”31” is compressed by the direction of spring is
compressed. And the valve”5” is opened by displacing upward of the diaphragm
rod”27” and connector”14” which is assembled with the diaphragm follower”30”, and
the fluid flows. In addition, the valve is displaced to the closing direction when the air
pressure is decreased.
Body
①
Valve seat
③
Cage
④
Gland packing
⑥
Yoke
⑬
Connector
⑭
Diaphragm rod
Diaphragm follower
Spring
Upper diaphragm case
Eye bolt
Diaphragm
Bottom diaphragm case
Name plate
Indicator plate
⑱
Bonnet
②
Valve
⑤
Air inlet
Nut
⑳
Gland flange
⑮
Drive parts
（
Actuator
）
Body part
Diaphragm bolt
Nut
⑪
Gasket
⑧