599 Series Zone Valve, 1/2-inch, three-way, globe body style, 1.0 Cv, diverting or mixing (limited application), controlled medium is water or glycol solutions to 50%, linear characteristic, ANSI Class 125, 1/10-inch (2.5 mm) stroke, 44 psi (303 kPa) close-off pressure, NPT end connections, and direct-coupled universal bonnet for actuator connection."