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Model GD-29S
Nominal size
20A
25A
32A
40A
50A
65A
80A
100A
Adjusting
screw
Spring
Diaphragm
Disc
5.1 Piping example
By-pass
Stop
Inlet side
valve
* Install a strainer on the inlet side of the pressure reducing valve of the nominal size 65A to 150A.
L
H
1
160
41
160
41
200
57
200
57
220
61
220
77
234
82
278
94
Reduced pressure
detection hole
5. Installation
Globe valve
Pressure gauge
GD-26-NE
Pressure reducing valve
JIS 16K FF flanged
H
d
D
170
20
100
170
25
125
224
32
135
224
32
140
239.5
50
155
329
65
175
345
80
200
412
100
225
4. 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.
Stop
valve
10
(mm)
C
t
n-φh
75
14
4-15
90
14
4-19
100
16
4-19
105
16
4-19
120
16
8-19
140
18
8-19
160
20
8-23
185
22
8-23
Pressure
gauge
Safety relief valve
Outlet side
Weight
(kg)
3.9
4.8
8.0
8.3
10.8
20.6
25.0
36.5
PDT-008o
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