Method 5: Replace the sealing gasket. Nowadays, most of them use asbestos board as the sealing gasket. In fact, it has poor sealing performance under high temperature and can not be used for long. In this case, spiral wound gasket can be used for better effect. 　　

The butterfly valve is simple in structure, small in size and light in weight, and only consists of a few parts. The valve can be quickly opened and closed only by rotating 90 °. The operation is simple. Together, the valve has outstanding fluid control characteristics. When the butterfly valve is in the fully open position, the thickness of the butterfly plate is the only resistance when the medium flows through the valve body, so the pressure drop through the valve is very small, so it has good flow control characteristics.