What factors affect the sealing performance of PE ball valve

PE ball valves (polyethylene ball valves) are widely used in fluid control systems due to their excellent sealing performance. The quality of sealing performance is directly related to the reliability and safety of the valve. Therefore, in-depth discussion of the sealing material selection, sealing structure design and fluid medium characteristics of PE ball valves is crucial to ensure its efficient operation.

Selection of sealing materials
As the core component of the sealing performance of PE ball valves, the selection of materials has a profound impact on the sealing effect. The following are commonly used sealing materials and their characteristics:
1. Polytetrafluoroethylene (PTFE)
PTFE is known for its excellent chemical resistance and high temperature resistance and is suitable for a variety of fluid media. Its low friction coefficient ensures that the valve is smoother when opening and closing, effectively reducing wear and extending service life.
2. Ethylene Propylene Diene Monomer (EPDM)
EPDM materials show excellent aging resistance, ozone resistance and heat resistance, and are particularly suitable for water and certain chemical media. Its good elasticity and sealing properties enable the valve to maintain excellent sealing effect under high pressure conditions, ensuring the stability of the system.
3. Fluororubber (FKM)
Fluororubber excels in high temperature and chemical resistance and is suitable for use in harsh environments. Its sealing performance is particularly outstanding under high temperature and high pressure conditions. It is widely used in the chemical and petroleum industries to meet the industry's strict requirements for safety and reliability.

Sealing structure design
The design of the sealing structure is also an important factor affecting the sealing performance of PE ball valves, mainly including the following aspects:
The shape of the sealing ring
The shape of the sealing ring has a direct impact on the sealing effect. O-rings and V-rings are common types of sealing rings. O-rings can form a uniform sealing surface when the valve is closed and are suitable for low-pressure environments; while V-rings are suitable for high-pressure environments and can withstand greater compression forces to ensure the sealing effect.
Processing accuracy of the sealing surface
The processing accuracy of the sealing surface directly affects the sealing performance. Excessive surface roughness may lead to poor sealing and leakage. Therefore, the processing of the valve body and valve core should meet strict precision standards to ensure the flatness and smoothness of the sealing surface and ensure the reliability of the sealing effect.
Preload force of the sealing ring
The preload force of the sealing ring is a key factor affecting the sealing performance. Appropriate preload can ensure good contact between the sealing ring and the valve body and valve core, thereby improving the sealing effect. Excessive preload may cause excessive wear of the sealing ring, while too little preload may increase the risk of leakage.

Characteristics of fluid medium
The properties of the fluid also play an important role in the sealing performance of the PE ball valve, which is mainly reflected in the following aspects:
Fluid temperature
The fluid temperature has a direct impact on the performance of the sealing material. High temperature may cause aging and deformation of the sealing material, thereby affecting the sealing effect; while low temperature may cause embrittlement of the material and increase the risk of leakage. Therefore, it is very important to select a sealing material suitable for the fluid temperature to ensure the stability and reliability of the valve under various temperature conditions.
Fluid pressure
Under high pressure environment, the sealing ring needs to withstand greater pressure, and the requirements for sealing performance are also increased. Excessive pressure may cause deformation or damage of the sealing ring, thereby affecting the sealing effect. Therefore, when selecting a PE ball valve, it is necessary to ensure that its rated pressure can meet the needs of the actual working conditions to ensure the safe operation of the system.