2. The common polymer materials cannot bear high temperature (below 350 ° C), but rigid high-purity graphite can bear high temperature below 900 ° C. Therefore, under high temperature load, whether the packing seal is dynamic sealing or not, rigid high-purity graphite or polymer materials are usually selected, but it should be noted that the friction resistance will be too large.

In order to reduce the degree of wear between parts, for valves, some grease can be added to prevent metal surface corrosion, such as commonly used mechanical oil or materials that can stay on the surface of pneumatic ball valves for a long time. This can form a protective film on the surface of ball valves, so that the equipment can reduce the degree of corrosion in use, which is also a good way of protection, However, this will also reduce the speed of the equipment during operation.