Proportional coolant valve

摘要

A rotary proportioning valve has a valve body with two inlet ports and an outlet port spaced apart about an axis. The valve body has a circular side wall and a first circular end wall closing one axial end of the side wall. Each of the ports intercepts at least the first end wall to communicate with interior space of the valve body. A shutter disposed within the interior space is supported for rotary positioning about the axis, and is operated by a shaft that extends through a second end wall that closes the opposite end of the body side wall. The shutter has a circular wall that confronts at least the first end wall. Plural fenestrations in the circular shutter wall are positioned relative to respective body ports in accordance with positioning of the shutter for proportioning flows into the inlet ports into a proportioned flow from the outlet port. A spring-loaded mechanism within the interior space of the valve body bears against the second end wall to maintain the circular shutter wall confronting the first end wall. In one embodiment, the shutter has an axial wall on the perimeter of the circular wall, the fenestrations extend into that axial wall, and the ports also extend into the side wall of the body.