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Gas-lubricated mechanical seal - 28VL series
The Type 28VL, which is manufactured by John Crane, is a non-contact, dry gas seal which is suitable to use in vaporizing fluids. The unit is also suitable to eliminate problems such as dry-running wear, and vapor lock in the seal chamber. The gas seal utilizes that rotational energy produced by the pump shaft to vaporize the process liquid at a controlled rate, generating a stable gas film which lubricates the face of the seal. The unit operates with a pressure limit of 124 bar per seal face, and a speed limit of 180 m/s.