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Vacuum discharge pumps are commonly used in the high-temperature vacuum circulation of distillation kettles, as well as in processes involving vacuum feeding and vacuum discharge. Generally, mechanical seals, bellows seals, and magnetic seals are employed for sealing purposes. Next, the editor will share with you the differences between single-face sealing and double-face sealing for vacuum discharge pumps: The basic forms of mechanical seals used in high-vacuum discharge pumps, classified by structure, include single-face mechanical seals, double-face mechanical seals, and tandem mechanical seals. One composed of a pair of sealed end faces is a single-end face mechanical seal ； A double-end face mechanical seal consists of two pairs of sealed end faces. Below, the structural features of the two types of mechanical seals are explained in detail to help understand the differences between single-face and double-face mechanical seals. 1. The single-face mechanical seal of vacuum discharge pumps features a simple structure, low manufacturing costs, and is easy to install and use; it is generally applied in oils, organic solvents, and corrosive media. 2. Double-end mechanical seals for vacuum discharge gear pumps are mostly used with flammable, explosive, toxic, particulate-containing, or poorly lubricable media. Typically, a sealing auxiliary system is required during use, whereby an isolation fluid is introduced into the sealing chamber between the two ends in order to improve the lubrication and cooling conditions of the mechanical seal. 3. Components for single- and double-face mechanical seals in high-vacuum gear pumps and related terms: Seal ring: In a mechanical seal, the two ring-shaped components whose faces are perpendicular to the axis of rotation and that come into contact with each other while sliding relative to one another are called seal rings. Sealing end face: The end face of the sealing ring that comes into contact with another sealing ring during operation; this end face is usually a ground surface. Rotating ring (moving ring): A sealing ring that rotates along with the shaft. Stationary ring: A sealing ring that does not rotate along with the shaft. Compensation ring: A sealing ring with axial compensation capability. Non-compensating ring: A sealing ring that does not possess axial compensation capability. Compensation ring assembly: Parts that axially connect and position the elastic elements. Drive seat: A component used to be fixed to the shaft or sleeve and to directly drive the rotating ring. Transmission screw: A screw used to transmit torque. Set screw: A screw used to fix the spring seat, drive seat, or other components to a shaft or sleeve. Clasp: A component that provides axial positioning for the compensation ring. Anti-rotation pin: A pin used to prevent adjacent parts from rotating relative to each other. Sealing chamber: refers to the annular space between the rotating shaft at the sealing installation site and the stationary housing. Sealed chamber: The stationary housing that contains the sealed chamber. Elastic elements: Parts that are elastic, such as springs or bellows. Friction pair: A set of sealing rings used in combination.