The main differences between American Standard valves and National Standard valves
1. The unit of the nominal diameter of the national standard valve is mm, and the unit of the nominal diameter of the American standard valve is in (inch).
2. The flange standard, American Standard, and the national standard are also different.
3. The length of the structure is not the same.
4. The inspection requirements are not the same; the American Standard valve inspection requirements than the national standard.
The valve is a control part of the fluid transfer system, with the function of cut-off, regulation, inflow, prevention of backflow, pressure stabilization, and diversion or overflow pressure relief.
Valves used in fluid control systems, from simple shut-off valves to extremely complex automatic control systems, are used in a variety of applications; their varieties and specifications are quite large. Valves can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, slurry, oil, liquid metal, and radioactive media.
Valves are also divided into cast iron valves, cast steel valves, stainless steel valves (201, 304, 316, etc.), chromium-molybdenum steel valves, chromium-molybdenum-vanadium steel valves, duplex steel valves, plastic valves, non-standard custom-made, and other valve materials according to the material.
American Standard valves are currently more popular is the API and ASME standards
American standard valves: according to the American standard design, the manufacture, production, and testing of valves are called American standard valves.
