Siemens 248-00231 ZONE VALVE, 3-WAY, 1/2", 2.5 CV, NPT W/ 24VAC, SSP61U ACTUATOR, 0-10VDC, NSRSiemens 248 00231 Zone valve, 3 way, 1 2", 2. 5 Cv, NPT w 24Vac, SSP61U actuator, 0 10Vdc, NSRZone valve and actuator assembly. 3 way valve body; NPT connection; Line size 0. 50 inch; Flow rate 2. 5 Cv; SSP61U 0 10Vdc, non spring return actuator, 24Vac, normally open Zone valve and actuator assembly. 3 way valve body; NPT connection; Line size 0. 50 inch; Flow rate 2. 5 Cv; SSP61U 0 10Vdc, non spring return actuator, 24Vac, AB A normally open