AS-CASPN Single Cartridge Mechanical Seal

This type is single cartridge mechanical seal to replace Cartex ASPN seal.

About Us：

Asinoseal is your perfect partner with experienced seals factory and manufacturer for producing & trading mechanical seals of various kinds, no matter single mechanical seals or double ones, split seal or boiler seal. The product provided by our reliable supplier in China range includes dry gas seal, split seal, agitator seal, cartridge seals, metal bellow seal and other component seals.

Background Knowledge：

Introduction to friction of mechanical seal O-rings

Friction forth is an important indicator of O type sealing ring.Friction of sealing ring includes adhesive friction and hysteresis friction. When calculating influence of friction of O-ring seal on compensation ring, we use adhesive friction. Adhesive friction consists of two parts, one part is friction caused by compression, which is related to contact length of the mechanical seal; the other part is caused by pressure difference between two sides of the sealing ring, which is related to the projection area of the sealing ring.

The reason why friction force of auxiliary seal ring cannot be ignored, especially balanced mechanical seal, is that load coefficient is close to back pressure coefficient, so end-surface specific pressure mainly depends on spring specific pressure and friction specific pressure. When friction specific pressure is greater than spring specific pressure, end-face specific pressure is negative, and the mechanical sealing surface will be opened while the mechanical seal will fail. Therefore, generally friction specific pressure should not exceed 0.02 MPa.

Another important indicator——cross-sectional diameter is quite linked with friction forth.

Under same conditions of use and compression rate, frictional force on sealing ring with a smaller cross-sectional diameter is smaller，which will cause less influence on floatability of sealing ring and specific pressure of end faces of mechanical seal.From a processing point of view, smaller cross-sectional diameter means smaller dimensional fluctuations, and it is easier to determine compression rate.
However, from the perspective of mechanical seal reliability, under the same compression rate, larger cross-sectional diameter means higher sealing reliability of itself, but friction force generated is also larger, which will reduce specific pressure of end faces of the mechanical seal and thus educe reliability of the main seal.

Therefore, cross-sectional diameter should be the smallest recommended value, and it is prohibited to select one that is not in the basic size series of O-ring seal.