Flow chamber shaft for disc coolant valves

Abstract

A rotary disc valve includes a rotatable assembly having a drive shaft with a flow control wall. The flow control wall includes an inner surface and an outer surface. The inner surface of defines a flow chamber within the drive shaft. A rotary disc is coupled to the drive shaft and is configured to rotate in unison therewith. The rotary disc includes an inner flow passage and an outer flow passage formed therethrough. The inner flow passage is always axially aligned with and fluidly coupled to the flow chamber of the drive shaft and the outer flow passage is always fluidly coupled to the outer surface of the flow control wall. A fixed disc sealing engages the rotary disc and includes a first flow opening, a second flow opening, and a third flow opening formed therethrough and disposed around the axis of rotation of the drive shaft.