What are the characteristics of the sealing structure design of PE ball valve

PE ball valve (polyethylene ball valve) is an indispensable key component in the fluid control system, and its sealing structure design is one of the core elements to ensure the performance of the valve.

Basic composition of sealing structure
The sealing structure of PE ball valve is mainly composed of three parts: sealing ring, valve core (ball) and valve body.
Sealing ring
The sealing ring is the core component of the sealing performance of PE ball valve, and high-performance polymer materials such as polytetrafluoroethylene (PTFE) and ethylene propylene diene monomer (EPDM) are usually selected. The design and material selection of the sealing ring directly determine the sealing effect and durability of the valve. High-quality sealing rings can not only resist the erosion of various fluids, but also maintain stable sealing performance under various working conditions.
Valve core (ball)
The valve core usually adopts a smooth spherical structure, which cooperates with the sealing ring to form a closed space. The rotational movement of the valve core is the key to controlling the flow of fluid, and its surface smoothness and geometric accuracy are crucial to the sealing performance. By optimizing the design of the valve core, the accuracy and response speed of fluid control can be effectively improved.
Valve body
The design of the valve body must meet the requirements of strength and pressure resistance at the same time, and ensure good contact between the sealing ring and the valve core. The flow channel design inside the valve body should minimize the resistance of the fluid to ensure the smooth flow of the fluid in the valve. Reasonable flow channel design not only improves the flow efficiency of the fluid, but also effectively reduces energy consumption.

Features of sealing structure design
Preload design
In the sealing structure design of PE ball valves, the preload of the sealing ring is an important consideration. Appropriate preload can ensure good contact between the sealing ring and the valve core, thereby improving the sealing performance. Factors such as material properties and pressure changes should be considered comprehensively during design. The recovery ability of sealing rings of different materials after compression varies, so the preload should be reasonably adjusted according to the specific material properties during the design process. In addition, under high pressure conditions, the preload of the sealing ring needs to be increased accordingly to ensure that the excellent sealing effect can be maintained under extreme conditions.
Shape and structure of the sealing ring
The shape and structure of the sealing ring have a direct impact on the sealing performance. Common types of sealing rings for PE ball valves include O-rings and V-rings. O-rings can form a uniform sealing surface when the valve is closed, are suitable for low-pressure environments, are simple in design, and are easy to install and maintain. The V-ring is suitable for high-pressure environments and can withstand greater compression forces to ensure sealing performance under high-pressure conditions. Its structural design effectively prevents fluid leakage.
Processing accuracy of the sealing surface
The quality of the sealing performance is closely related to the processing accuracy of the sealing surface. The processing accuracy includes the surface smoothness and geometry of the valve body and valve core. The surface of the valve body and valve core should be as smooth as possible to reduce the resistance of the fluid flow and ensure that the sealing ring can fit tightly. At the same time, the spherical design of the valve core must ensure that the contact surface between it and the sealing ring is uniform to avoid poor sealing due to improper geometry.