Pump mechanical seal is mainly composed of three parts, one is the base, which should be installed in the pump body, which can be made of many materials. The second is a sliding ring, generally circular, rectangular cross-section, combined with other seals installed in the Pump shaft, generally made of carbon and other wear-resistant sealing material is good, the third is to have a pressure clamping device, which can be a spring or other ways. Sliding ring mounted on the pump shaft, with the pump shaft rotation, the binding part is static contact, sealing is good, by the pressure of the pressing device, the sliding ring tightly pressed on the base, that is to say the sliding ring is Rotate on the base to form a dynamic seal, because graphite, pencil shavings and other carbonaceous materials of small molecular weight, quality, sealing is better, but also to increase the lubrication of the function, so the rotation can be completely sealed. However, it should be noted that in the processing, the machining accuracy to be higher, and the installation should pay attention to the location of the angle, etc., bearing in mind the installation of mechanical seals do not touch the sliding contact surface, even if you can not see a fingerprints may also be Affect the final performance.