fully welded ball valves is widely used in various fields. its superior quality and high performance stability is beyond the reach of ordinary cast steel ball valves, and life is far greater than the cast steel ball valve, fully welded ball valves are widely used in city gas, urban heating, petrochemicals, shipbuilding, steel, tone all kinds of pressure on the station piping equipment, power plants and so on. fully welded ball valve using a long-term reliable operation, requiring maintenance, installation is simple, the other more convenient to install the valve. purpose: city gas: gas export pipeline, the main trunk and each branch supply pipes. central heating: large heating equipment output line, trunk, branch. heat exchangers: pipeline and various open and close the loop. steel plant: a variety of liquid pipelines, gas pipelines optional release, gas and heat supply pipelines, fuel supply pipe. a variety of industrial equipment: various heat pipes, all kinds of industrial gas and heat pipes. features: one-piece fully welded ball valve, there will be no external leakage phenomenon, since the seat is carbonized teflon seal ring and coffee springs, so strong change of pressure and temperature adaptability, in marked pressure and temperature range slip inside without any leakage. processing sphere detector with advanced computer tracking and detection, so the sphere of high precision. since the body material with the same pipe material, stress does not appear uneven, it will not because of the earthquake and the vehicle through the ground and sometimes deformed, anti-aging pipelines. seal ring body with content 20% c (carbon) in ptfe material, guarantee no leakage (0%). view product website/fully-welded-ball-valves-api-6d.html