- Item Code: DI021A
- Pressure Rating: PN-20
- Testing Standard: As per IS 5321
- Size Range: 50mm to 300mm
- Product Standard: As per 5321
Suitable For
Material Specification
| P. NO. | NAME OF PART | MATERIAL | SPECIFICATION |
|---|---|---|---|
| 1 | STUDS & NUTS | CARBON STEEL | BS 916 |
| 2 | COVER | DUCTILE IRON | ASTM A395 |
| 3 | GASKET | RUBBER / C.N.A.F. | IS 638 TYPE B |
| 4 | HINGE PIN | H.T. BRASS | BS 2872 OR BS 2874 CZ114 |
| 5 | HINGE | D.I. / C.C.S. | ASTM A395 / ASTM A216 Gr. WCB |
| 6 | BODY | DUCTILE IRON | ASTM A395 |
| 7 | SEAT RING | GUN METAL | BSEN 1982 Gr. CC491K |
| 8 | DISC | DUCTILE IRON | ASTM A395 |
| 9 | DISC RING | GUN METAL | BSEN 1982 Gr. CC491K |
| 10 | WASHER | BRASS / GUN METAL | BS 2872 OR BS 2874CZ114 / BSEN 1982 Gr. CC491K |
| 11 | NUT | H.T. BRASS | IS 6912 Gr.FHTB1 |
| 12 | SIDE PLUG | STAINLESS STEEL | ASTM A276 TYPE 410 |
Dimensional Data
| SIZE (mm) | 50 | 65 | 80 | 100 | 125 | 150 | 200 | 250 | 300 |
|---|---|---|---|---|---|---|---|---|---|
| A | 203±2 | 216±2 | 241±2 | 292±3 | 350±2 | 356±2 | 495±2 | 622±4 | 698±4 |
| B | 16 | 16 | 21 | 22 | 23.8 | 23 | 24.5 | 26 | 27.5 |
| ∅C | 50 | 65 | 80 | 100 | 125 | 150 | 200 | 250 | 300 |
| ~H | 126 | 145 | 154 | 196 | 196 | 204 | 242 | 281 | 337 |
| ∅D | 165 | 185 | 200 | 220 | 254 | 285 | 340 | 395 | 445 |
| K | 125 | 145 | 160 | 180 | 215.9 | 240 | 295 | 350 | 400 |
| n | 4 | 4 | 4 | 8 | 8 | 8 | 8 | 12 | 12 |
| ∅d | 19 | 19 | 19 | 19 | 22.2 | 23 | 23 | 23 | 23 |
Principle Features
INTRODUCTION
Leader Ductile Reflux Valves are designed with high sensitivity to pressure so that the valve closes immediately before significant fluid starts flowing backward. Fluid reversing backward causes damage to equipment like boilers or pumps. The valve is activated by the flowing material in the pipeline. The pressure of the fluid passing through the system opens the valve, while any reversal of flow will close the valve. Closure is accomplished by the weight of the check mechanism, by back pressure. Entirely automatic in action, depending upon differential pressure and velocity of flow within the line to perform their functions of opening and closing.
- Designed as per IS: 5312.
- Bolted Cover, Swing Disc design.
- Metal to Metal seating.
- Body castings made of superior Ductile Iron ASTM A395 grade to ensure additional strength.
- Gun Metal Body & Disc rings.
- Design Prohibits Galling or Scoring of Seating Surfaces.
- One-Piece Disc Construction Designed to Withstand Severe Service Conditions.
- Large Bolted-On Cover Provides Easy Access to Interior for Routine Maintenance.
- Rigid & Sturdy design.
- Long service life as wear is minimal which makes it highly reliable.
- Valve is mechanically automatic and thus it does not need an actuator or valve operator.
- A horizontal or vertical duct can be used, easy to install.
- The valve must be installed in the direction of the flow arrow.
- Flanged ends as per ASME B16.5 CL-150 (FF).
- Widely applied for low-pressure and ambient-temperature utility services such as water supply, power plants, irrigation projects, air conditioning systems as well as fire fighting systems to prevent the backflow.
END CONNECTION
- Flanges as per ASME B16.5 CL-150 (FF), Drilled.
- Flange drilling as per other standards also available upon request.
UTILISATION & SERVICE
- “LEADER” Ductile Iron Reflux Valve are suitable for above-ground installations.
- Best suited for potable water, treated fresh water, neutral liquids & some gases.
WORKING PRESSURE
- Maximum Working Pressure: 20 Bar.
- See Pressure / Temperature Diagram.
TEMPERATURE LIMITS
- Maximum Working Temperature: 220°C.
- See Pressure / Temperature Diagram.
TEST PRESSURE (Hydrostatic)
| Rating | PN-20 |
|---|---|
| Body (Hyd.) | 30 Bar |
| Seat (Hyd.) | 22 Bar |