b' : The 2-way 2 position normally closed air gas directional control solenoid is to control On/Off of air, inert gas, liquid, and vacuum. This solenoid has 1/4 inch BSP thread. stays close when the coil is de-energized- and it opens when energized. Has two holes in the bottom and can be mounted in any position. It s suitable for liquid, water, oil, high-end water heaters, intelligent drinking fountains, water heaters, straight drinking machines, water purification machines, steam machines, energy-saving air-conditioning, water treatment, cooling equipment and water industry and other fields. Features: - Direct operated type normally closed 2-way solenoid valve, quick direction changing and high sensitivity. - DC 24V 1/4 quick connect solenoid valve. Light and compact structure. - Keep constant current steady flow as well as preventing the dry burning and monitoring the flow. - Normally Closed. Open when current through, closed when no current through. Specifications - Color: As shown - Body Material: Anodized Aluminum - Seal Material: NBR (Buna-N) - Armature Tube Material: Brass - Plunger and Spring Material: Stainless Steel - Size: Approx. 5.5 x 3 x 2.2 cm / 2.16 x 1.18 x 0.86 inch(LxWxH) - Type: 2 Ways 2 Positions, NC - Connection Size: 1/4 BSP port - Winding voltage: DC 24V - Service Media: Air, Gas - Operating model: Direct acting - Flow model: Uni-directional - Flow Rate: 0.23CV (Fluid Flow), 22 SCFM at 100 PSI (Air Flow) - Working Pressure: 1.0MPa (Water, Air, gas) - Max. Pressure Resistance: 1.2MPa - Response time: Less than 50ms - Operating pressure: 0-0.8 (can be operated at 0 PSI (vacuum)) - Operating temperature: -10 to +80 C - Coil Power: 6.5w - Coil Class: F Class IP 65 '