Regarding pump sealing

A mechanical seal is a device designed to prevent fluid leakage, consisting of at least one pair of end faces perpendicular to the axis of rotation, which remain in close contact and slide relative to each other under the action of fluid pressure and the elastic force (or magnetic force) of a compensation mechanism, as well as with the assistance of auxiliary seals. A mechanical seal in which the auxiliary seal of the compensation ring is a metal bellows is called a bellows mechanical seal. Components of a mechanical seal: There are mainly the following four types of components. a. Main seals: rotating ring and stationary ring. b. Auxiliary seal: sealing ring. c. Compression elements: springs, push rings. d. Transmission components: spring pan seat and key or fixing screw. Classification of mechanical seals: Based on whether the spring element rotates or remains stationary, they can be divided into rotary internal-flow unbalanced single-face seals, abbreviated as rotary types ； Stationary external-mounted internal-flow balanced single-face seal, abbreviated as stationary type. Based on whether the static ring is located inside or outside the sealing end face, they can be divided into internal-type and external-type. Based on the leakage direction of the sealing medium, they can be classified into internal leakage and external leakage types. Based on the unloading condition caused by the medium at the end face, it can be divided into balanced and unbalanced types. Based on the logarithm of the sealed end face, they can be classified as single-end-face and double-end-face. Based on the number of springs, they can be divided into single-spring type and multi-spring type. Classified by elastic elements: spring compression type and bellows type. Classified by non-contact mechanical seal structure: hydrostatic type, hydrodynamic type, and dry gas seal type. Classified by seal chamber temperature: high, medium, standard, and low-temperature seals. Classified by seal chamber pressure: ultra-high, high, medium, and low-pressure mechanical seals.