Thread swing check valve

1. Product Overview

Threaded check valves are automatic devices that allow fuel to flow in only one direction. In the petroleum industry, these valves are typically installed immediately after pumps or along pipelines to prevent pressure drop or backflow when the pump stops.

2. Specialized Technical Specifications

3. Common Types of Threaded Check Valves for Fuel

A. Swing Check Valve

• Mechanism: Uses a freely hanging disc that opens with flow and closes when flow stops.
• Advantages: Low flow resistance (minimal pump pressure loss), highly durable.
• Note: Best suited for horizontal pipelines.

B. Spring Check Valve

• Mechanism: Uses a spring to press the disc shut.
• Advantages: Can be installed vertically, horizontally, or at an angle. Closes quickly, excellent against water hammer.
• Disadvantage: Slightly higher flow resistance compared to swing type.

4. Why Customers Should Choose for Fuel Systems

• Prevents “fuel drain-back”: Keeps pipelines filled, allowing pumps to start immediately without priming.
• Protects pumps: Stops reverse pressure surges from higher tanks that could damage impellers.
• Safe materials: Stainless steel and brass do not generate sparks, ensuring safety in explosive environments.
• Specialized sealing: Viton/PTFE gaskets resist fuel exposure, unlike rubber gaskets that degrade quickly in oil.

5. Key Advantages

• Compact design: Easy to install in fuel pump cabinets, tanker trucks, or underground pipelines.
• Automatic operation: Requires no manual control, reliable 24/7.
• Cost-effective: More economical than flanged types while still effective for small pipelines.

6. Practical Applications

• Retail fuel stations: Installed at the suction side of fuel pumps.
• Fuel tanker trucks: Mounted at discharge outlets to prevent backflow during disconnection.
• Generator systems: Used on fuel supply lines from storage tanks to engines.