The 4-Way Brass Mixing Valves 720, 721, 722, 723, and 724 are used to mix supply water from a heat source with water returning from a system. They are designed for use in either closed loop or open loop hydronic systems. All valves have standard female NPT threads. The valve provides a maximum leak through rate of 1% to allow for water expansion during temperature changes. The valve position can be manually set using the handle. An Actuating Motor 741 can be used to automatically operate the valve. Literature + D 720 Maximum Operating Pressure + 146 psi (10 bar) Operating Temperature Range + -20 to 248+F (-28 to 120+C) Valve Body and Vane + CW 617N - EN 12165 Brass Shaft Seal + Viton "O" ring Main Seal + EPDM Perioxide "O" ring Acceptable Fluid Media + Chilled and hot water with antifreeze and anticorrosive compounds (max 60%), glycol, ethyl alcohol glycol, propylene dichloride alcohol, mono ethyl alcohol, ethyl methyl alcohol, glycerine. Not for use with media based on mineral oil components or chlorinated pool water.