Metrex Valve Corporation manufactures the broadest line of water regulating valves available for heat transfer purposes. Exacting engineering and rigorous quality control standards ensure consistent high quality of all Metrex products. Metrex valves are completely self contained, self powered and self regulating, resulting in set and forget reliability. This line of valves has evolved over 40 years in response to the demands of the water cooled refrigeration and air conditioning industries.