Patent ID: 6820637
Filing Date: 2004-11-23
Classification: F01P,F24H,G05D,Y10T

Abstract:
A check valve for controlling the flow of engine coolant supplied to a marine water heater, the heater including a water tank and a heat exchanger in the tank, the check valve comprising:a body having opposite first and second ends and a longitudinal bore; a hot water fining on the first end of the body adapted to supply water from the tank to the body; an engine coolant fitting on the second end of the body adapted to supply engine coolant to the body; an engine coolant outlet in the body adapted to supply engine coolant to the heat exchanger so as to heat water in the tank; a valve mounted within the body and being movable between a closed position closing the engine coolant fitting and an open position opening the engine cooling fitting; and a actuator in contact with the water flowing through the hot water fitting, the actuator expanding in response to increasing water temperatures such that the valve moves toward the closed position and adapted to contract in response to decreasing water temperatures such that the valve moves toward the open position.