Emergency Unloading Valve

Emergency Unloading Valve

The emergency unloading valve, also known as a safety valve, is a direct-acting, self-resetting valve designed for automatic overpressure protection. Utilizing a spring-loaded ball and ball seat release mechanism, the valve automatically overflows when system pressure exceeds the preset setpoint—safeguarding personnel and high-pressure equipment.

Key Features & Applications

• Adjustable Release Pressure: A top adjusting bolt allows operators to easily adjust the release pressure from 14 MPa to 140 MPa.

• Automatic Operation: Powered directly by system pressure, the valve opens automatically when pressure exceeds the preset limit and reseals/closes automatically once pressure drops.

• Versatile High-Pressure Deployment: Suitable for high-pressure fluid control pipelines with maximum working pressures of 105 MPa or 140 MPa, reciprocating piston pumps, pressure vessels, and other systems requiring reliable overpressure protection.

Basic Parameters

• Nominal diameter: 2" to 3"

• Working pressure: 5,000 PSI to 20,000 PSI

• Temperature: –75 °F to +250 °F (–60 °C to +121 °C)

• Main materials: AA, BB, CC, DD, EE, FF, HH

• Specification level: PSL1–3

• Performance level: PR1