The operation of butterfly valve allows for quick shut off and is generally favored because of the economical cost and it has more lighter weight than other valve design. Therefore, they don't need more support.
Actually, there are diverse of butterfly valves, each adapted for different pressures. For instance, the concentric butterfly valve uses the flexibility of rubber. And the high-performance double eccentric butterfly valve is applied for the higher-pressure medium. But the center line butterfly valve has a resilient seat with a metal disc. All of them are widely used in the gas, power plant, medical, shipbuilding, piping system etc.