Patent ID: 7229102
Filing Date: 2007-06-12
Classification: B23Q,F16L

Abstract:
1. A coolant union having a primary seal assembly and a tubular carrier member axially movable within a union housing having a wall defining a cylindrical inner chamber and having an annular groove within the union housing, with the carrier member adapted to receive fluid coolant and structurally arranged to direct the coolant through the union to an associated tubular rotor, with the rotor having a sealing member thereon and the axially movable tubular carrier member having a sealing member thereon, with the carrier member axially movable between a pressurized position wherein the sealing members are in contact and an unpressurized position wherein said sealing members are spaced apart from each other, with the coolant union having a secondary seal assembly including in combination: a U-shaped seal member positioned in the annular groove within the housing and structurally arranged to provide a seal between the carrier member and the cylindrical inner chamber of the housing when the coolant union is in the operating pressurized position; and wherein said U-shaped seal member includes a chamfered portion structurally arranged to cooperate with a back-up ring member to provide an unfilled volume therebetween defined by said chamfered portion to create a micro-popoff and to prevent dry-running of said primary seal assembly when the union is operating in the unpressurized position.