Pneumatic seals are critical components used in pneumatic systems to prevent gas leakage and ensure the proper functioning of the system.
Here is a detailed introduction:
Function and Working Principle
The primary role of pneumatic seals is to maintain the integrity of air pressure, prevent leakage, and protect internal components from contamination, while ensuring the smooth movement of moving parts (such as piston rods, pistons, etc.) in pneumatic equipment. By closely fitting with the moving parts, they form a seal in a low-pressure gas or air environment, preventing gas from escaping at the sealing point.
Materials
Nitrile Rubber (NBR): Offers good gas and oil resistance, suitable for general pneumatic sealing applications.Polyurethane (PU): Excellent wear resistance and flexibility, capable of withstanding certain friction and impact, commonly used in situations where high wear resistance is required.
Fluorocarbon Rubber (FKM): Possesses superior high-temperature resistance and chemical corrosion resistance, suitable for use in high-temperature or chemically corrosive environments.
Types
Piston Rod Seals: Used to seal the gap between the cylinder piston rod and the cylinder barrel, preventing gas leakage. For example, ARUP piston rod seals, made of polyurethane material, feature a dynamic lip design without sharp edges, which facilitates sliding and can be used in unlubricated air;ARG double-acting piston rod seal Glyd Ring, consisting of a sealing ring and a force-applying O-ring, is suitable for pneumatic applications with limited installation space and low friction.
Piston seals: Mainly used to seal the gap between the piston and the cylinder, ensuring the airtightness of the piston during reciprocating motion. For example, double-acting Glyd Rings made of materials such as Turcon T19 and T24 are suitable for different working conditions and media.
Buffer seals: Serve as a buffer in pneumatic systems, reducing the impact of moving parts at the end of the stroke.Some buffer seals of Trelleborg sealing systems, made of polyurethane rubber, can operate within a certain range of temperature and pressure.
Static seals: Used for sealing between fixed components to prevent gas leakage. Common examples include O-rings, which are widely used in the static sealing parts of pneumatic valves, cylinders, and other equipment.
Application Areas
Pneumatic seals are widely used in numerous fields such as industrial automation systems, robotic arms and manipulators, packaging and food processing machinery, semiconductor manufacturing equipment, textile machinery, and medical devices. These industries rely on pneumatic seals to ensure the precision, reliability, and lifecycle efficiency of their equipment.
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