When using butterfly valves to control the speed of these fans, variable speeds of 1500 to 2000 RPMs (rotations per minute) were possible. In 1893, Carl Benz invented the carburetor butterfly valve which made it possible to vary the running speed of a gasoline engine. Other innovations were made throughout the 20th century. A resilient butterfly valve has a rubber seat that creates a tight seal around the gate. These valves carry a pressure rating of 232 psi (pounds per square inch). They are good for liquids and gasses. High performance butterfly valves offer many improved design capabilities over resilient butterfly valves, including bi-directional service, direct mount actuation, and high-temperature applications (to 648 degrees Celsius). These valves carry a pressure rating of around 725 psi. Tricentric butterfly valves use metal seats and boast pressure ratings of 1450 psi.

More products of valves

Globe Valves

Safety valves

Plug Valves

Reducing Valves

Balance Valves