JB / T7747-2010 needle globe valve JB / T7749-1995 cryogenic valves technical conditions JB / T8527-1997 metal sealing butterfly valve JB / T8528-1997 common seal butterfly JB / T8529-1997 flameproof valve electric device technology JB / T8531 -1997 valve manual device technology, basic manual valve is a valve-driven approach. It includes a hand wheel, lever or wrench two direct drive and driven through the transmission mechanism. When the valve start torque is large Guangzhou stainless steel valves, may be driven by a gear or worm gear Guangzhou stainless steel valves, omitted in order to achieve objectives. Gear sub spur gear and bevel gear drive. Gear reduction ratio, suitable for gate and globe valves, worm gear reducer relatively large for flash cocks, ball and butterfly valves, the Hong Kong marine valves _ (online consultation) _ Guangzhou valve by 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.