First, since the two valves are in the mutual bypass, they will not be closed due to simultaneous failure, so the water supply will not be interrupted. Since the two control valve circuits have their own functions, any failure of one circuit will affect the automatic operation of water supply. For example, when the instrument is powered off, the whole instrument system is generally powered off. There are two control valves that have no signal pressure at the same time. In other cases, the control valve can also have no signal pressure. Therefore, the feedwater control valve may be fully closed due to failure. 　　　　

Many enterprises must choose pneumatic ball valve because of its compact structure, product quality and operating performance. In addition to the basic structural design, fixed ball valve operation and flowing ball valve operation are also designed according to production requirements, all of which are to help the use and operation of ball valves, Moreover, the sealing performance of the ball valve is very good, which can meet the processing and demand of a product at different levels.