Stem diameter: Bright bar for multi-turn valves. It can not be assembled into electric valve. So Wafer butterfly, 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 butterfly, so that after the assembly can work. 1, butterfly main control parameters for size specifications. 2, a single butterfly valve plate, its simple structure, easy processing, low cost, easy to operate, but poor accuracy adjustable flange electric butterfly valve, switch or coarse adjustment for the occasion only for ventilation and air conditioning systems. 3, can be manual, electric or zip-operation, fixed at any angle 90 ° range. 4, due to the uniaxial single plate wafer type valve electric butterfly, bear limited force, under great pressure when large flow rates valve short life. The valve has closed and the general style of the points, thermal and non-thermal points. 5, electric butterfly just double-control, electric valve actuators and multi-leaf same. Carbon steel flange butterfly valve out of Hong Kong, Meizhou butterfly valve provided by the Hong Kong Science and Technology Co., Ltd., Dongguan Ming. Port Valve Co., Ltd., Dongguan Ming (www.gdmgfm.com) is Dongguan, butterfly leaders, over the years, the company implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. In the next port of the valve leading the staff warmly welcome all inquiries negotiations to create the next port of the valve a better future.