Siemens 171A-10366 599 SERIES 3W, 1-1/4", 40CV BALL VALVE, 3-POS FLOAT, NSRSiemens 171A 10366 This 599 Series 3 way ball valve with a non spring return 3 position (floating) actuator assembly, providing 200 PSI close off, is used to control hot or chilled water and up to 50% glycol solution in air handlers, convectors, fan coil units, unit conditioners, radiation and reheat coils. This 1 1 4 inch valve is 40 Cv, with chrome plated brass ball and brass stem, includes an operating handle that can manually operate valve in the