American standard copper valve in the 1980s we have been using cast iron as the material, followed by focus on copper American standard valve production and technical research, copper American standard valve developed quite rapidly. Copper American Standard valve purchasing common sense is as follows: First, according to the installation structure selection. Pipe system installation structure has pipe thread, flange, ferrule, welding, hoses and so on. Therefore, the valve installation structure must be consistent with the pipe installation structure, and the size of the specifications to be consistent; Second, according to operating conditions, the commonly used valve technical parameters include the work pressure, the maximum allowable working pressure, working temperature (minimum and maximum temperature ) And the medium (corrosive, flammable), the selection should pay attention to the conditions of the above parameters and the technical parameters of the valve is consistent; Third, according to the control function selection, all kinds of valves have their own functions, the selection should pay attention to its corresponding Features.