Simple structure, direct-acting back pressure valve.
Fewer failures and long lifespan.
When the diaphragm material is stainless steel, it is compatible with steam, gas, water, and liquids.
Specifications and Materials
Fluid | Primary Side Set Pressure Range (¹) (MPa) | Temperature (°C) | Main Component Materials | Pipe Connection | ||||
---|---|---|---|---|---|---|---|---|
Valve Body | Spring Cover | Lower Cover | Valve & Seat | Diaphragm | ||||
Air, Water, and Other Non-Corrosive Gases and Liquids | 0.03~0.055 (Standard) | 0~60 (²) | Cast Iron | Cast Iron | Cast Iron | Stainless Steel | Synthetic Rubber (¹) | Flange JIS 10K Full Face |
0.055~0.085 | Cast Iron | Cast Iron | Cast Iron | Stainless Steel | Synthetic Rubber (¹) | Flange JIS 10K Full Face | ||
0.085~0.13 | Cast Steel | Cast Iron | Carbon Steel | Stainless Steel | Synthetic Rubber (¹) | Flange JIS 20K Flat Face | ||
0.13~0.2 (Medium) | Cast Steel | Cast Iron | Carbon Steel | Stainless Steel | Synthetic Rubber (¹) | Flange JIS 20K Flat Face | ||
0.2~0.3 | Cast Steel | Cast Iron | Carbon Steel | Stainless Steel | Synthetic Rubber (¹) | Flange JIS 20K Flat Face | ||
Steam, Air, Water, and Other Non-Corrosive Gases and Liquids | 0.3~0.45 | 0~220 | Cast Iron | Cast Iron | Cast Iron | Stainless Steel | Stainless Steel | Flange JIS 10K Full Face |
0.45~0.7 | Cast Iron | Cast Iron | Cast Iron | Stainless Steel | Stainless Steel | Flange JIS 10K Full Face | ||
0.7~1.0 (High) | Cast Iron | Cast Iron | Cast Iron | Stainless Steel | Stainless Steel | Flange JIS 10K Full Face | ||
1.0~1.6 | Cast Steel | Cast Iron | Carbon Steel | Stainless Steel | Stainless Steel | Flange JIS 20K Flat Face | ||
1.4~2.0 | Cast Steel | Cast Iron | Carbon Steel | Stainless Steel | Stainless Steel | Flange JIS 20K Flat Face |
Note (¹): If the diaphragm is made of synthetic rubber, the set pressure should be 1.0 MPa or lower.
(²): For temperatures exceeding 60°C and up to 110°C, manufacturing is also available.
Remarks:
- ASME Class 150・300 can also be manufactured.
- Manufacturing with a stainless steel valve body is also available.
Performance
Parameter | Specification |
---|---|
Offset | 10% or less of the maximum set pressure |
Valve Seat Leakage | 0.5% or less of the rated flow rate |
Diaphragm Material | Nominal Diameter (mm) | Primary Side Set Pressure Range (MPa) | |||||||
---|---|---|---|---|---|---|---|---|---|
0.03~0.055 | 0.055~0.085 | 0.085~0.13 | 0.13~0.2 | 0.2~0.3 | 0.3~0.45 | 0.45~0.7 | 0.7 | ||
Synthetic Rubber | 15 | 0.40 | 0.78 | 1.30 | 1.71 | 1.55 | 1.74 | 1.75 | 1.75 |
20 | 0.42 | 0.82 | 1.38 | 1.79 | 1.82 | 2.20 | 2.28 | 2.28 | |
25 | 0.42 | 0.82 | 1.38 | 2.14 | 1.82 | 2.23 | 2.28 | 2.28 | |
40 | 0.70 | 1.34 | 2.23 | 3.88 | 2.72 | 3.70 | 3.36 | 3.36 | |
50 | 0.79 | 1.50 | 2.52 | 4.44 | 3.35 | 5.35 | 5.12 | 5.12 | |
Stainless Steel | 15 | 0.08 | 0.15 | 0.24 | 0.78 | 0.96 | 0.96 | 1.08 | 1.08 |
20 | 0.09 | 0.17 | 0.30 | 1.10 | 1.11 | 1.11 | 1.11 | 1.11 | |
25 | 0.09 | 0.17 | 0.30 | 1.18 | 1.11 | 1.11 | 1.11 | 1.11 | |
40 | 0.21 | 0.41 | 0.66 | 1.49 | 1.58 | 1.64 | 1.64 | 1.64 | |
50 | 0.35 | 0.69 | 1.10 | 1.88 | 2.09 | 2.20 | 2.20 | 2.20 |
Remark: If the offset is 20% or less of the maximum set pressure, the Cv value will be twice the values listed in the table above.
Structure and Dimensions
Dimensions and Weight
Material / Flange | Nominal Diameter | L | Hi | h2 | E | Mass |
Cast Iron JIS 10K | 15 | 186 | 89 | 320 | 225 | 25 |
20 | 190 | 89 | 320 | 25 | ||
25 | 190 | 89 | 320 | 28 | ||
40 | 230 | 113 | 328 | 38 | ||
50 | 250 | 127 | 336 | 40 | ||
Cast Steel / Stainless Steel / Cast Stainless Steel JIS 20K | 15 | 182 | 93 | 320 | 225 | 27 |
20 | 186 | 93 | 320 | 27 | ||
25 | 186 | 93 | 320 | 30 | ||
40 | 226 | 117 | 328 | 40 | ||
50 | 246 | 131 | 336 | 45 |
Remark: Manufacturing for nominal diameter 65 mm is also available.