Valves are control components in fluid transportation systems, with functions such as cutoff, regulation, diversion, prevention of backflow, stabilization, diversion, or overflow pressure relief. Valves used in fluid control systems have a wide variety of varieties and specifications, from the simplest globe valves to various valves used in extremely complex self-control systems. Valves can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metals, and radioactive media. It is commonly used on ships to control fluids such as compressed air, cooling water, hydraulic oil, etc. 1、 Classification of valves There are many types of valves, and there are multiple classification methods. They are generally divided into: 1. Cut off valves: mainly used to cut o...