QDY421F / QDQ421F Gas-Liquid Emergency Shut-Off Valve with 5 Seconds Shut-Off Time, Fusible Alloy Links, and Bubble-Tight Sealing
Product Details
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The QDY421F / QDQ421F Series is a high-performance Gas-Liquid Emergency Shut-Off Valve specifically designed for critical safety protection in LPG (Liquefied Petroleum Gas) and Liquid Ammonia storage and distribution systems. These valves are essential safety components installed on liquid and gas phase pipelines to provide rapid isolation in the event of a leak or fire.
When used with a hydraulic hand pump or pneumatic control system, the valve can be triggered to shut down completely within 5 seconds, preventing catastrophic leaks and ensuring the safety of personnel and facilities.
- Rapid Emergency Response: Closes automatically in less than 5 seconds to isolate flow during emergencies.
- Fail-Safe Fire Protection: Integrated fusible alloy links melt at 70 °C ± 5°C, automatically releasing pressure to trigger an immediate shutdown in the event of a fire.
- Bubble-Tight Sealing: High-quality PTFE seals ensure zero leakage under rated pressure conditions.
- Durable Construction: Heavy-duty body made of Carbon Steel or Stainless Steel, designed for the rigorous demands of chemical and fuel storage environments.
- Versatile Media Support: Optimized for handling Liquefied Petroleum Gas (LPG), Liquid Ammonia, and other hazardous fluids.
| Parameter | Specifications |
|---|---|
| Model Number | QDY421F-25 (Hydraulic) / QDQ421F-25 (Pneumatic) |
| Nominal Pressure (PN) | 2.5 MPa |
| Shell Test Pressure | 3.75 MPa |
| Seal Test Pressure | 0.1 / 2.75 MPa |
| Working Temperature | -40°C to +50°C |
| Shut-Off Time | ≤ 5 Seconds |
| Fusible Link Melting Temp | 70°C ± 5°C |
| Actuator Working Pressure | 2.5 MPa to 4.0 MPa |
| Part Name | Material |
|---|---|
| Body / Bonnet / Cylinder | Carbon Steel / Stainless Steel |
| Disc / Stem / Piston | 20Cr13 / SS304 / SS316 |
| Sealing Ring | PTFE (Teflon) |
| O-Rings | NBR (Nitrile Rubber) |
| Compression Spring | 50CrVA |
| Fusible Alloy | Wood's Metal / Specialized Alloy |
- Actuation Method: Hydraulic (QDY) or Pneumatic (QDQ)
- Nominal Diameter: DN50 - DN300
- Body Material: Carbon Steel or Stainless Steel
- Operating Media: LPG, Ammonia, etc.
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