In 1951 Keystone Valves launched a new valve concept - the rubber seated butterfly valve. Since then, through constant innovation and customer feedback, Pentair offers trims and sizes of butterfly valves to suit most applications having to do with isolation and control of liquids, gases or slurries. By both mechanical and polymer engineering Keystone butterfly valves have a strong focus on providing valves that offer long life through high cycle capabilities. Benchmarking ensures Keystone remains a leader in this critical area against other makers of butterfly valves for the process sectors.
With the rapid development of industrial technology, the valve industry made more stringent requirements, especially for use in cryogenic medium butterfly, in addition to meet the general performance of the valve with a normal condition and, more importantly, in the low temperature under the valve seal reliability, flexibility and movement of cryogenic valves some other special requirements.
Flange butterfly valves with simple structure, small size and light weight is assembled by several components. Valves are able to be open or close rapidly according to the disc revolve during 0 degree to 90 degree. When flange butterfly valve is in the fully open position, the disc thickness is only object which affect resistance. Therefore, flange butterfly valves are able to be controlled the flow. For flange butterfly valve, the material of sealing structure is PTFE, and valve seat consist of synthetic rubber. Because the friction coefficient of PTFE is low enough, it will reduce the damage of valve body and increase the valve life.Flange butterfly valve is a valve with a flange, it is suitable to use flange butterfly valve to connect the pipes with flange.