Patent ID: 6253837
Filing Date: 2001-07-03
Classification: F01M,F01P,F16H,F28D,F28F,G05D,Y10T

Abstract:
A by-pass valve for a heat exchanger circuit, the by-pass valve comprising:a housing defining a chamber therein and first, second and third main ports communicating with the chamber, the first main port being a by-pass valve port, the valve port having a central axis and a peripheral valve seat; a temperature responsive actuator located in the chamber and having a reciprocating central shaft disposed along said central axis, the central shaft having a closed end portion for partially closing the valve port; an annular ring slidably mounted on the closed end portion and extending transversely from the central shaft to engage the valve seat and completely close the valve port; bias means for urging the annular ring toward the valve seat; and a return spring mounted in the housing below the annular ring and being connected to the central shaft to urge the central shaft end portion to retract and open the valve port.