Manual valve is a valve basic driving mode. It includes a hand wheel, lever or wrench two direct drive and driven through the transmission mechanism. When the valve start torque is large Taiwan Toyama Valve Co., Ltd., can be driven by a gear or worm gear, in order to achieve the purpose of omission. Gear sub spur gear and bevel gear drive. Gear reduction ratio smaller Shanghai Guanlong Valve Machinery Co., Ltd., is suitable for gate and globe valves, worm gear reducer relatively large for flash cocks, ball and butterfly JB / T6439-2008 valve pressed steel castings magnetic particle inspection JB / T6440-2008 valve pressed steel castings Radiographic examination JB / T6899-1993 valve fire resistance test JB / T6902-2008 valve castings liquid penetrant inspection method JB / T6903-2008 valve forgings ultrasonic inspection method Toyama Valve Co., Taiwan The company, Ming Kong valves (online consultation), the valve is provided by the valve, the Hong Kong Science and Technology Co., Ltd. of Dongguan. Valve Co., Ltd., Dongguan Ming Kong (www.gdmgfm.com) is Dongguan, butterfly leaders, over the years, the company implement the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Ming Kong valve leadership with the staff warmly welcome all inquiries negotiations to create a better valve out of Hong Kong in the future.