Double end-face mechanical seal has a good sealing performance, applicable to the sealing of strong corrosive, high temperature, suspended particles and fibers medium, gas medium, inflammable and explosive, volatile low viscosity medium and high vacuum etc.

　　Alkyl benzene pumps with mechanical seal for single mechanical seal, the newly-built sulfur device has a higher requirement for the sealing with the medium of MDEA, so choose the double end-face mechanical seal.

　　Double mechanical seal not only a repeat of the single type, in some key situations of chemical industry, can effectively prevent dangerous and the leakage of toxic, flammable, explosive substances, has high performance insurance function. When in high pressure medium sealing, can reasonable to assign each pressure at both end seal, improve the sealing work pressure range. For some poor self lubricating, easy condensation, vaporizing medium, by injecting the sealing liquid into the seal chamber improve the sealing conditions, greatly improve the efficiency and service life of sealing.

　　Double mechanical seal with a single mechanical seal principle is basically the same,

　　Principle of Double mechanical seal is basically the same as single end face mechanical seal, depends the end face (friction pair) which perpendicular to the rotation axis in the function of fluid pressure and elastic effect of compensation agencies with the cooperation of auxiliary seal to keep fit and relative sliding while formed the device to prevent fluid leakage.

　　While working, In the resultant action of fluid pressure (medium pressure) and the elasticity of elastic element and other function caused by pressure, produce an appropriate pressure (pressing force) In the end face of the seal ring, make two abutting surface (actin ring face, static ring face) fit closely to each other, and maintain a layer of special thin liquid film in a very small gap between the two ends surface, to achieve the purpose of sealing.

　　Double mechanical seal has two end face seal,if the primary seal fail, the secondary seal still can be sealed to prevent leakage. Generally, double seal need the outside sealing liquid system to introduce sealing liquid into the seal cavity for the dam,lubrication and cooling, and mostly used for circulating cooling. The sealing liquid not only can wash the seal pair to improve the working condition of mechanical seal, but also can serve as important tool to detect whether the failure of the primary sealing surface.

　　More about Othello double end-face mechanical seal, Please contact oth01@othchina.com oth02@othchina.com