What is a single bellows balanced seal

The single-end bellows balance type seal is a mechanical seal composed of a pair of sealing end faces. It has a simple structure and is easy to manufacture and install. It is generally used when the medium itself has good lubricity and allows trace leakage. It is a commonly used mechanical seal. type. It consists of two sets of friction pairs, forming a sealed cavity filled with nitrogen gas under pressure. When the seal is in operation, an air film of about 3 microns is formed between the friction pairs. . A gas with a pressure higher than the medium pressure is added into the sealed chamber to achieve zero escape of the process medium. Only trace amounts of gas leak to the environment. The single-end bellows balanced seal adopts built-in, internal flow, balanced type, multi-spring external and auxiliary seal shielding protection, which can prevent the blocking and corrosion of the medium pair, and has compensation and sealing performance in harsh environments to ensure the tight end face. fit. The grease filled between the auxiliary sealing ring and the protective sleeve ensures the flexible movement of the sealing ring, and at the same time reliably transmits the pressure to the end face. The unique floating structure end face obtains more uniform temperature rise and higher pressure resistance with smaller size. It is a device for preventing fluid leakage by keeping the end face perpendicular to the rotation axis under the action of fluid pressure and the elastic force of the compensation mechanism and the cooperation of auxiliary seals to keep fit and slide relatively. It is not easy to use when the medium is toxic, flammable, explosive and has strict requirements on leakage. It is suitable for mechanical sealing of glass-lined stirring vessels with nominal pressure less than or equal to 0.4MPa and working temperature greater than -20-200°C. The outer diameter of the stirring shaft is 40-140mm, and the speed of the rotating axis is less than 2m/S.