Stem diameter: Bright bar for multi-turn valves. It can not be assembled into electric valve. Therefore, if the electric valve device allows the maximum stem diameter can not be dispensed through the valve stem. The inner diameter of the hollow output shaft of the electric system must be greater than the next shot the valve stem diameter. The local rotary valves and rotary valves in the dark bar valve stem diameter, although not considered by the problem, but should be fully considered when matching stem diameter and keyway size, so after assembly to work properly. Suitable for flow adjustment valve. Because of the pressure loss in the pipeline valve is relatively large, should be considered to bear the disc media pressure pipeline shutdown ruggedness. Further heating valves must also be considered to limit the operating temperature at high temperatures endured elastic seat material. Butterfly structure length and overall height of the smaller brands valve opening and closing speed of high-end valves, and has good flow control characteristics, Butterfly structure principle most suitable for the production of large diameter valves. When asked to use the butterfly valve to control the flow, the most important is the right size and type of butterfly valves, so that it can be properly and effectively work. Pipeline valves, valve Shenzhen, next to Hong Kong valve provided by the Port Valve Co., Ltd., Dongguan Ming. Port Valve Co., Ltd., Dongguan Ming (www.gdmgfm.com) strong, credible, butterfly and other industries in Dongguan, Guangdong has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead the next port of the valve and you hand into the brilliant, for a better future!