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What is the function of the compression ring in compression fittings

Update:13 Nov
The compression ring in a compression fitting is a critical component that plays an important sealing role at the pipe connection point.
Structure and materials
The compression ring usually adopts a circular ring structure, and its inner diameter is adapted to the outer diameter of the pipe. It has a certain degree of elasticity and can elastically deform when compressed to achieve effective sealing with pipes and compression nuts.
Material selection for compression rings is critical, and the following materials are typically used:
Rubber: Rubber is a common compression ring material that offers superior elasticity and corrosion resistance. It is suitable for a variety of applications and provides reliable sealing performance under different temperature and pressure conditions.
Polymers: Some high-performance plastics, such as polytetrafluoroethylene (PTFE) or polyethylene (PE), are also used to make compression rings. They have excellent chemical and abrasion resistance.
Metal: In some special high temperature or high pressure applications, the compression ring may be made of metal materials, such as stainless steel or copper alloy, to ensure its high temperature resistance and corrosion resistance.
Sealing principle
elastic deformation
The main sealing principle of compression rings is based on their elastic deformation. When the compression nut is tightened, the force exerted on the compression ring causes it to elastically deform so that it conforms to the surface between the pipe and the compression nut. This elastic seal ensures a reliable isolation layer at the pipe connection point, preventing leakage of liquid or gas.
Compression adjustment
By adjusting the tightening force of the compression nut, the degree of compression of the compression ring can be controlled, thereby affecting the tightness of the seal. Proper compression force is the key to ensuring effective sealing of the compression ring. Excessive or insufficient compression force may affect sealing performance.
Design and installation considerations
Design process
Geometry: The geometry of a compression ring should be carefully designed to ensure even deformation when compressed, creating a uniform seal.
Durability: The design of the compression ring should consider its durability for long-term use to ensure that it maintains its elasticity and sealing properties during multiple compressions and releases.
installation steps
Surface Cleaning: Before installation, make sure the surface of the pipe connection point is clean and free of impurities or dirt to ensure a good seal.
Proper lubrication: During installation, proper lubricant can be used to reduce the friction of the compression ring and ensure that it can deform evenly during the tightening process.
Tightening force control: During the installation process, properly control the tightening force of the compression nut to prevent excessive compression or loosening, which will affect the sealing performance.