Pressure Self-sealing Check Valve

Pressure Self-Sealing Check Valve – Overview

The pressure self-sealing check valve is designed to automatically prevent reverse flow in high-pressure pipelines by utilizing the system’s own pressure to achieve a secure seal. This valve type is particularly suited for applications where traditional bolted bonnet designs may be less efficient, as the pressure-assisted sealing structure reduces the risk of leakage under extreme operating conditions.

Key Design Features

• Self-Sealing Bonnet Design
  Uses the internal line pressure to create a tight seal at the bonnet joint, eliminating the need for high numbers of bolting and enhancing sealing reliability under high pressure.

• Robust Body Construction

  • Materials: Carbon steel, alloy steel, or stainless steel for various temperature and pressure requirements.

  • Pressure Classes: Commonly available in Class 600 to Class 2500.

• Disc and Seat Arrangement
  Swing or tilting disc options depending on flow conditions, with hard-faced seating surfaces to withstand erosive service.

• Standards Compliance
  Manufactured in accordance with API 6D, ASME B16.34, and tested per API 598 for shell and seat tightness.

Applications

• High-Pressure Steam Pipelines – Ideal for power generation and industrial steam distribution systems.

• Petrochemical Processing – Handles high-pressure hydrocarbon flows with temperature fluctuations.

• Refining Units – Suitable for crude oil and process fluid backflow prevention.

• Boiler Feedwater Systems – Maintains directional flow integrity in high-pressure boiler lines.

Advantages

• Enhanced Sealing Under Pressure – The higher the internal pressure, the tighter the seal at the bonnet joint.

• Leakage Risk Reduction – Minimizes bonnet joint leaks in extreme conditions.

• Durability in Harsh Environments – Hard-facing materials extend seat life in erosive or high-temperature flows.

• Compact Maintenance – Bonnet removal is simplified compared to fully bolted designs.