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How mechanical seals work

mechanicalseals Mechanical seals within this group are used mainly in the chemical process, petrochemical and similar industries, where leakage control is highly important due to the working fluid characteristics, it can be toxic, corrosive or explosive, this type of mechanical seals usually work under very critical conditions, for that reason some of them are hydraulically balanced to support high pressures, besides they can be manufactured with the appropriate materials to resist extremely high or low temperatures.

The main componests for seals are:

The rotating component that moves together with the rotating shaft.
The stationary component that is fixed to the pump housing.
The spring that presses the rotating component onto the stationary component axially.

Rotating Component

This is a ring, usually consisting of 2 types of materials - a soft carbon piece with a highly polished axial surface, and a rubber material or o-ring that is able to grip the shaft for sealing against water leak through the shaft surface.

Stationary Component

The stationary ring is usually made of stainless steel, although there are some made of ceramic or similar hard materials. The axial surface is also highly polished. At the circumference of the stationary piece, a rubber o-ring will be installed to seal against water leak through the pump housing.

Spring

The spring(s) is installed around the shaft and rotates with the rotating component. The purpose of the spring is to press the rotating component of the mechanical seal against the stationary component so that the matching surfaces are in contact with each other axially to the shaft.Because the axial rubbing surfaces in contact are very highly polished, there is almost no leak there. Water does not leak through the pump housing opening because of the o-ring pressed between the stationary component and the pump housing. Water will also not leak through the shaft because of the o-ring in the rotating component gripping against the shaft.