Generally speaking, the choice of seal gasket material mainly depends on the following 3 elements, namely temperature, stress and medium. Based on the service conditions, the nature of the fluid and the industrial applications, there are 3 varieties of seals (two-element or cartridge seals in single or dual configuration). Depending on the applications, unbalanced (U) or balanced (B) may be used.
Here is a comparison among gland packing and mechanical seals, and how you can make a decision which one is correct for you. The gas seals are prevented from touching by the creation of a hydrodynamic stress designed by tiny grooves cut in the face of the rotating ring which pushes the gas towards the seal, forcing the two surfaces.
Gland packing is also known as the standard shaft seal. A lot of engineers never suggest packings for a lot of applications due to the needs and fees of maintenance. Sealing off liquids or gases isn’t as effective either, as a packing is prone to occasional leakage. You want to often adjust so that the seal is effectively-lubricated.
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High quality mechanical seals are the best value. Contemporary cartridge seal designs do not damage the pump shaft or sleeve. Mechanical seal faces are manufactured to a flatness that is measured utilizing wavelengths of light. Such fine tolerances imply higher precision gear.
As the faces rub with each other, a fluid film migration in between the 2 faces is applied for cooling and lubrication purposes. The pumped fluid will ideally weep between the faces, getting into as a liquid and remaining until it is vaporised as it reaches atmosphere.
Higher bearing loads, consequently causing the mechanical loading of the shaft. This could cause the grinding of the impeller in the pump casing or even much more leakage of the mechanical seal. In the case of boiler feed pumps, seals have to cope with higher sliding velocities, heat transfer from the fluid handled and the heat generated by friction.