Choice of gate valve In recent years, the gate valve as a tool to control the direction of water flow and water, its form has also changed. In the past commonly used flashlight dual-purpose gate valve is gradually replaced by flashlight dual-use butterfly valve, butterfly valve has the advantages of small size, light weight, easy installation, drag coefficient. The disadvantage is that if the processing and installation accuracy is not enough, or when the water is more likely to lead to the butterfly valve is not tight, there is leakage phenomenon, while the traditional gate valve is not easy to leak, but the bulky; especially large diameter gate valve, large and bulky, installation and removal Are inconvenient; more importantly, due to bulky, resulting in increased pump room area, the project cost increases. Therefore, pumping station design, bidding and selection of valves should consider the following two issues: a use of occasions not subject to site restrictions, more debris in the water, easy to plug the important position of the valve, dual-use flashlight valve can be used; otherwise it can be used In particular, the butterfly valve can be used as a butterfly valve in the pumping station reconstruction project in order to effectively utilize the space of the original pumping station and achieve the purpose of increasing the water supply and discharge volume under the premise of unchanged original pumping station area. Two manufacturers choose a larger, longer production life, stresses credibility, quality clearance and is responsible for installation and commissioning of the valve manufacturer. With the continuous improvement of the precision of the butterfly valve, the quality will get better and better, and the water leakage problem will be solved. At that time, the butterfly valve will replace the old gate valve, which is the development trend of valves.