Condition responsive by-pass valve construction and method of making the same

Claim 1

In a condition responsive by-pass valve construction having a housing means provided with an inlet and two outlets interconnected to said inlet, said housing means having a valve seat means disposed between one of said outlets and said inlet, said valve seat means comprising a first cylindrical chamber part of said housing means interconnected by an annular angled surface of said housing means to a second cylindrical chamber part of the housing means that is larger in diameter than said first chamber part, said housing means carrying a movable valve member means for controlling the flow of fluid through said valve seat means to said one of said outlets to provide substantially a linear percentage by-pass flow between said inlet and said one of said outlets as said valve member means moves between a fully opened position thereof and a fully closed position thereof where said valve member means is sealing disposed in said first chamber part, said housing means carrying a condition responsive means for controlling movement of said valve member means, the improvement wherein said annular angled surface of said valve seat means has groove means therein extending between said first chamber part and said second chamber part and intersecting therewith for said valve member means to be progressively bridging and unbridging to provide said substantially linear percentage by-pass flow.