Is it better to use a ball valve or a globe valve for liquid ammonia, or can either be used?

Liquid ammonia has specialized shut-off valves for ammonia.

What is the difference between special ammonia stop valves for liquid ammonia and ordinary stop valves?

Why are globe valves better than ball valves? ? ?

Stop valve. The ball valve contains a sealed cavity; when it is shut down, the vaporization of liquid ammonia can cause the valve body to explode.

1: The installation ports of ammonia stop valves, that is, the flange surfaces, are concave. To maintain optimal sealing performance for ammonia, all the sealing surfaces of ammonia stop valves are designed to be concave, whereas ordinary stop valves have both convex and concave sealing surfaces. It is generally convex. II: The difference between ammonia-specific stop valves and ordinary stop valves is most evident in their color. Ammonia-specific stop valves feature a specified gray-yellow combination; the valve body of such valves is gray-black while the handwheel is yellow. In contrast, ordinary stop valves have a silver-gray valve body with a sky-blue handwheel. 3: The model of the stop valve for ammonia is J41B, while the common model is J41H. The sealing surface of the stop valve used for ammonia is made of babbitt alloy, whereas that of ordinary stop valves is made of the alloy of the valve body itself. The above three differences are the most obvious ones; their distinctions can be seen with the naked eye.

1: The installation ports of ammonia stop valves, that is, the flange surfaces, are concave. To maintain optimal sealing performance for ammonia, all the sealing surfaces of ammonia stop valves are designed to be concave, whereas ordinary stop valves have both convex and concave sealing surfaces. It is generally convex. II: The difference between ammonia-specific stop valves and ordinary stop valves is most evident in their color. Ammonia-specific stop valves feature a specified gray-yellow combination; the valve body of such valves is gray-black while the handwheel is yellow. In contrast, ordinary stop valves have a silver-gray valve body with a sky-blue handwheel. 3: The model of the stop valve for ammonia is J41B, while the common model is J41H. The sealing surface of the stop valve used for ammonia is made of babbitt alloy, whereas that of ordinary stop valves is made of the alloy of the valve body itself. The above three differences are the most obvious ones; their distinctions can be seen with the naked eye.

The packing box of the ammonia stop valve is also different

Ammonia stop valves have a specific standard, GB/T 26478-2011 \"Stop Valves and Lift Check Valves for Ammonia.\" Ammonia and copper can undergo a complexation reaction to form complexes. Therefore, it is very important that ammonia valves do not contain copper; this is also a requirement for valves designed specifically for ammonia use.