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QDY421F / QDQ421F Gas-Liquid Emergency Shut-Off Valve with 5 Seconds Shut-Off Time, Fusible Alloy Links, and Bubble-Tight Sealing
QDY421F / QDQ421F Gas-Liquid Emergency Shut-Off Valve with 5 Seconds Shut-Off Time, Fusible Alloy Links, and Bubble-Tight Sealing
Specifications
Nominal Pressure :
2.5 MPa
Weight :
10
Working Temperature :
-40°C to +50°C
Brand Name :
Guoyue
Place of Origin :
Jiangsu, China
MOQ :
1 piece
Shut-Off Time :
≤ 5 Seconds
Shell Test Pressure :
3.75 MPa
Seal Test Pressure :
0.1 / 2.75 MPa
Certification :
CE
Model Number :
customized
Packaging Details :
Standard Export Package
Delivery Time :
12~60 days depends on products type
Payment Terms :
T/T
Supply Ability :
2500 Ton/Tons Per Year
Description
QDY421F / QDQ421F Gas-Liquid Emergency Shut-Off Valve
Product Overview

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.

Key Features
  • 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.
Technical Specifications
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
Material Configuration
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
Ordering Information
To provide an accurate technical proposal, please specify:
  • 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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QDY421F / QDQ421F Gas-Liquid Emergency Shut-Off Valve with 5 Seconds Shut-Off Time, Fusible Alloy Links, and Bubble-Tight Sealing

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Product Detail
Nominal Pressure :
2.5 MPa
Weight :
10
Working Temperature :
-40°C to +50°C
Brand Name :
Guoyue
Place of Origin :
Jiangsu, China
MOQ :
1 piece
Contact Supplier
QDY421F / QDQ421F Gas-Liquid Emergency Shut-Off Valve with 5 Seconds Shut-Off Time, Fusible Alloy Links, and Bubble-Tight Sealing

Guoyue Hydraulic Equipment Manufacturing (jiangsu) Co., Ltd

Verified Supplier
1 Years
jiangsu, wuxi
Since 2022
Business Type :
Manufacturer
Main Products :
Custom Hydraulic Cylinder, Hydraulic Cylinder, Double Acting Hydraulic Cylinder
Total Annual :
20Million-50Million
Employee Number :
>50
Certification Level :
Verified Supplier
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