BY-PASS VALVES FOR HEAT EXCHANGERS

摘要

A by-pass valve (14) and a heat exchanger (12) employing the same is disclosed where the by-pass valve (14) makes a short circuit from the heat exchanger inlet (26) to the heat exchanger outlet (30) to disable the heat exchanger (12) under certain temperature conditions. The by-pass valve (14) includes a housing (46) defining a chamber (48). Three main ports (50, 52, 54) communicate with the chamber (48), one (54) being a valve port. A temperature responsive actuator (64) located in the chamber (48) operates a spring loaded valve (62) to open and close the valve port (54). The valve port (54) can be connected to one of the heat exchanger inlet (26) or outlet (30), the other main ports are then connected in series with the other of the heat exchanger inlet (26) or outlet (28).