1、FINE WORKMANSHIP: Valve body adopts a 0.04um mirror surface inner wall, with a more durable debugging button for smoothly and low loss replacement. The coil has sufficient turns and power, making it less prone to overheating during long term operation. 2、EXCELLENT PERFORMANCE: Premium self lubricating sealing ring; 4 ring accuracy valve stem; High accuracy pilot head, 5 seconds per response, high frequency without jamming. 3、WORKING PRINCIPLE: When the coil is powered off, the valve remains open and closes when powered on. 4、EASY DISASSEMBLY AND COIL REPLACEMENT: The inner core nut can be removed without the need for tools, making coil replacement simple and convenient. 5、SENSITIVE RESPONSE: Air solenoid valve is a single control solenoid valve with an internal pilot structure and a sliding column structure, with good sealing performance and sensitive response.