Fushiman Co.
Fushiman D260 type differential pressure valve for steam
Manufacturer: Fushiman Co.,LTD.
Model: D260
| Model | Nominal diameter | Primary pressure measurement | Differential pressure setting range | Maximum operating temperature | Body Material | Connection |
|---|---|---|---|---|---|---|
| D260 | 15–80 | Max. 1.0 MPa | 0.03 to 0.8 MPa | 220°C | FC, FCD | Flanges |
The D260 differential pressure valve is used in boiler combustion lines, etc.
The primary valve is the P260 pressure reducing valve. For detailed specifications of the primary valve, please refer to the P260 pressure reducing valve (page 6 and beyond).Specifications and Performance
| Item | Specification |
|---|---|
| Nominal Diameter | 15–80 |
| Main Valve Fluid | Steam |
| Detecting Fluid | Gas, Non-Corrosive Liquid |
| Primary Side | Maximum Pressure P₁: 1.0 MPa |
| Maximum Temperature: 220°C | |
| Secondary Side P₂ | 0.03–0.9 MPa |
| Detecting Pressure P₃ | 1.0 MPa or lower |
| Differential Pressure Setting Range (ΔP = P₂ – P₃) | 0.03–0.2 MPa, 0.1–0.8 MPa |
| Cv Value | 4.5d² → 3.1d² |
| Minimum Pressure Reduction Ratio | 10% of Primary Side Pressure (Min. 0.07 MPa) |
| Offset | 0.03 MPa or lower |
| Hysteresis | 0.02 MPa or lower |
| Minimum Adjustable Flow Rate | 5% of Rated Flow |
| Valve Leakage Rate | 0.05% or lower of Rated Flow |
| Valve Body Material | Cast Iron |
| Main Valve & Main Valve Seat | Stainless Steel |
| Piston & Cylinder | Stainless Steel |
| Diaphragm | Stainless Steel |
| Spring Guard | Bronze |
| Main Valve & Strainer Connection | Flange Type, JIS 10K Full Face |
Notes:
- The main valve performance values are based on a detected pressure P₃ of 0 kPa (atmospheric pressure).
- The Cv value is the same as that of the P260 pressure reducing valve (see page 7 for reference).
- Offset, shut-off pressure rise, and minimum adjustable flow rate are reference values (target values).
- For nominal diameters 15 to 40, the valve body is made of spheroidal graphite cast iron.
Structure and Dimensions
Dimensions
| Nominal Diameter (mm) | L (mm) | H₁ (mm) | H₂ (mm) | K (mm) | Weight (kg) |
|---|---|---|---|---|---|
| 15 | 145 | 78 | 175 | 130 | 8 |
| 20 | 150 | 73 | 180 | 130 | 8.5 |
| 25 | 160 | 71 | 182 | 130 | 10 |
| 32 | 175 | 77 | 193 | 131 | 12 |
| 40 | 190 | 85 | 203 | 126 | 14 |
| 50 | 210 | 95 | 217 | 126 | 18 |
| 65 | 235 | 111 | 236 | 126 | 26 |
| 80 | 265 | 123 | 253 | 126 | 32 |
Installation Example
The nominal diameter selection for the D260 differential pressure valve, piping examples, and alarm safety valve nominal diameter selection are the same as those for the P260 pressure reducing valve (pages 7 and 9). Please refer to them.
