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NG SERIES DRY GAS SEAL
NG series dry gas seal is a non-contacting mechanical seal lubricated by gas film, which combined hydrodynamic and hydrostatic effect. Dry gas seals are main ly used in turbo-compressors, turbo-expanders, etc. in natural gas pipeline, refinery, petrochemical industries, chemicalindustries and other industries.
Compared with other mechanical seals, the main distinctive attribute of dry gas seal is thatshallow grooves are machined on the sealing face of either rotating ring or stationary ring.
Sealing faces do not contact during dynamic operation by means of gas film between them, resultin galmost no wear. The sealing face grooves are using patented technologies which include Face sealwith spiral grooves’ and Bi-direction rotatable face seal with spiral grooves’. According to the arrangements of sealing faces, there are five types of seals, single seal, double seal, tandem seal, tandem seal with intermediate labyrinth, tandem seal with prepositive labyrinth.
NGD Double Dry Gas Seal Application Scope :
The double seal is used where leaked of the progress gas to the atmospher is unacceptable,but a little buffer gas leakage in to the process could be admissible.Such as the gas is dirty,unstable or there is a dangher of negitive prassure.
