Introduction to Check Valves

A check valve, also known as a non-return valve or one-way valve, is a mechanical device that allows fluid (liquid or gas) to flow through it in only one direction. It prevents backflow, protecting equipment and maintaining system integrity.

How It Works

• Check valves operate automatically—no manual control is needed.

• They open when the upstream pressure is greater than the downstream pressure.

• They close when flow reverses, using gravity, spring force, or backpressure to seal the valve.

Key Features

• Prevents Backflow: Essential in systems where reverse flow could damage equipment or contaminate media.

• Self-Actuating: No external power or operator required.

• Low Maintenance: Simple design with few moving parts.

• Versatile: Suitable for liquids, gases, and slurries.

Limitations

• Not for Pulsating Flow: Can cause chatter or premature wear.

• Pressure Drop: Some designs introduce resistance to flow.

• Orientation Sensitive: Some types must be installed in a specific direction or position.