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Nominal
size
20A
25A
32A
40A
50A
65A
80A
100A
1. Initial closed state
The valve is closed by the spring force while the inlet pressure is lower than the set pressure.
2. Start to discharge
As the inlet pressure increases, the force pushing up the valve becomes closer to the spring force
pushing down the valve, and the product starts to discharge.
3. Discharge
When the fluid pressure becomes larger than the spring force due to the increased inlet pressure and
being supported by the valve cover, the vale opens.
4. Closing
After the fluid is discharged to the air, the inlet pressure decreases. The valve closes when the fluid
pressure becomes smaller than the spring force.
5. Discharge by lever
Discharge check can be done by pulling up the lever when the inlet pressure is 80% of the set pressure
or higher.
d
d
d
1
2
20
32
18.5
25
40
23
32
50
29.5
40
65
36.5
50
80
46
65
100
59.5
80
125
73
100
150
91
3. Operation
L
H
0
1
85
85
100
100
105
110
115
125
120
130
140
160
160
180
180
200
3
(mm)
Flow area
H
2
(mm
)
360
268
375
415
450
683
470
1046
510
1661
680
2780
785
4185
895
6503
■EPDT-395■
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