The mechanical seal is the relative motion of the end face of the ring by a pair of mutually abutting form a slight axial clearance from the sealing effect, this device is called the mechanical seal.

　　The mechanical seal is usually composed by a snap ring, stationary ring, pressed components and sealing elements. The end face of the ring and stationary ring is composed of a pair of friction ring by pressure of the liquid seal chamber face pressed to the stationary ring side, two ring-side surface of a layer of extremely specific pressure and maintain appropriate a thin liquid film to achieve the purpose of sealing. Pressed the components generate pressure, the pump also maintained the state does not run, the end face fit, guarantee no leakage sealing medium, and to prevent contaminants from entering the seal faces. The sealing element from the sealing ring and the axis of the gap B, the role of the clearance C of the stationary ring and the gland, and the vibration of the pump at the same time, the impact dampening effect.

　　Mechanical seal in the actual operation is not an isolated member, which is combined together with the other components of the pump run, through its basic principle can be seen, the normal operation of the mechanical seal is conditional, such as: Pumpchanneling can not be too large, otherwise the friction pair end face can not form the normal requirements than the pressure; mechanical seal at the pump shaft can not have too much deflection uneven pressure than would otherwise end face and so on.Only to meet the external conditions like this, coupled with good mechanical seal own performance in order to achieve the desired sealing effect.