Patent ID: 7104461

Claim:
A temperature control device for preventing liquid in a pipe from freezing comprising: a control valve having a housing in fluid communication with the liquid in the pipe, a valve seat, a ball valve and a bimetallic disk, an inlet and an outlet; wherein said bimetallic disk has a first deactivated position wherein said bimetallic valve presses said ball valve against said valve seat to prevent flow through said control valve body, and a second activated position wherein said bimetallic releases said ball valve from said valve seat to allow flow through said control valve body; wherein when the temperature of liquid in said housing is above a first predetermined temperature the bimetallic disk moves to said first position and when the temperature is below a second predetermined temperature the bimetallic disk moves to said second position to allow liquid in said pipe to flow through said control valve, and a perforated spring seat is positioned within said control valve to permit the flow of liquid through said control valve.