7
EPDT-351
3. Operation
The spring is compressed by the adjusting screw,
the diaphragm is pushed down, and thereby the
disc directly connected to it is opened.
Fluid coming in from the inlet side flows out from
the upper part of the disc to the outlet side, and
passes through the reduced pressure detection
hole, and is led to the bottom of the diaphragm.
The load of the spring and the reduced pressure act
to the diaphragm, and the upper and lower force
keeps a balance and regulates the valve opening.
As a result, the diaphragm keeps the reduced
pressure constant.
4. Installation
4.1 Piping example
* Install a strainer on the inlet side of the pressure reducing valve of nominal size 65A to 100A.
* Make sure that pipes 3m before and after the product, both the inlet side and outlet side, are of the same
diameter.
Outlet side
By-pass
Globe valve
Pressure gauge
Pressure
gauge
Safety relief valve
Inlet side
Stop
valve
GD-28S-NE
Pressure reducing valve
Stop
valve
Adjusting
screw
Diaphragm
Reduced pressure
detection hole
Disc
Spring
