Multi-media rotating union

摘要

A rotating union (10) communicates with a rotor member (36) and is operable with either compressible or incompressible coolant media that enters the union through a media inlet (15). The union includes a housing (12) having a counterbore (14) and a tubular carrier member (16) axially moveable in the housing. The union includes a primary seal assembly having a rotating seal member (32) mounted to the rotor member (36) and a non-rotating member (34) mounted to the carrier member and a secondary seal member (20) positioned about the carrier member (16). The range of the balance ratio of the primary seal assembly (32, 34) is disclosed when the primary seal assembly has imposed upon it a closing force, an opening force or no force.