NormallyOpen: When the coil is energized, the pilot hole closed, the valve chamber and pressurized by the piston return spring throttle thrust, the electromagnetic valve is closed.
常开：当线圈通电时，先导孔关闭，阀上腔由活塞节流孔增压和复位弹簧的推力，电磁阀关闭。
2
Valve types include NormallyOpen and Normally Closed valves, for use in fuel, hydraulic, or pneumatic applications.
阀门有常开和常闭两种，可用于燃油，液压或气动应用领域。
3
This valve is normally automatic work, in a direction of flow of fluid under pressure, open the flap valve;