 
Welded steel ball valve Uses:
  1) city gas: gas output pipeline, the main line and the supply line and other feeder lines. 
  2) central heating: large heating equipment output pipeline, trunk lines, feeder lines. 
  3) heat exchanger: pipe and the circuit opening and closing. 
  4) Iron and steel plants: all kinds of fluid pipelines, exhaust gas pipelines, gas and heat supply pipelines, fuel supply pipelines. 
  5) a variety of industrial equipment: a variety of heat treatment pipes, all kinds of industrial gas and heat pipes.
  
Welded steel ball valve main connection size:
| DN | Nominal diameter Bore | DH | d | t | L | H1 | H2 | A | Weight kg Weight kg | 
| A / B | |||||||||
| 50 | 40 | 89 | 60.3 / 57 | 4 | 300 | 35 | 135 | 180 | 4 | 
| 65 | 50 | 108 | 76.1 / 76 | 4 | 300 | 35 | 144 | 275 | 5.2 | 
| 80 | 65 | 133 | 88.9 / 89 | 5 | 300 | 44 | 154 | 275 | 6.3 | 
| 100 | 80 | 159 | 114.6 / 108 | 5 | 325 | 50 | 193 | 365 | 11 | 
| 125 | 100 | 193 | 139.7 / 133 | 5 | 325 | 42 | 218 | 365 | 16 | 
| 150 | 125 | 219 | 168.3 / 159 | 6 | 350 | 83 | 343 | 650 | 24 | 
| 200 | 150 | 273 | 219/219 | 7 | 400 | 84 | 345 | 800 | 39 |