Comprehensive Analysis of Ball Valve Sealing Surface Selection: How to Make Precise Selections Based

Comprehensive Analysis of Ball Valve Sealing Surface Selection: How to Make Precise Selections Based on Conditions

The selection of ball valve sealing surfaces involves multiple factors, including medium type, working conditions, operating temperature, surrounding environment, and the performance requirements of the sealing surface. The following is a detailed analysis of ball valve sealing surface selection:

1. Medium Type

Different media have different requirements for sealing surface materials. For example:

• For strongly acidic or alkaline media, PTFE-lined series (such as PTFE) are recommended for their excellent corrosion resistance.

• For media with severe particle erosion, cemented carbide and ceramic seals offer strong erosion resistance.

• For gaseous media, PTFE-lined seals are recommended. The maximum temperature for PTFE-lined series is 120°C; for higher temperature gases, PFA or PPL series may be selected.

2. Working Conditions

The working conditions of the ball valve, such as pressure and flow rate, also affect the selection of sealing surfaces. For example:

• Under high-pressure and high-flow conditions, materials with high structural strength, good wear resistance, and corrosion resistance should be selected.

• When higher sealing force is required, seals with PTFE coating on the surface may be selected to reduce leakage.