Operation; Installation; Piping Example - Yoshitake GD-28S-NE Product Manual

Adjusting
screw
Spring
Diaphragm
Disc

4.1 Piping example

By-pass
Stop
Inlet side
valve
* 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.
Reduced pressure
detection hole
Globe valve
Pressure gauge
GD-28S-NE
Pressure reducing valve

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

Stop
valve
7
Pressure
gauge
Safety relief valve
Outlet side
EPDT-351