Two-way floating butterfly valve

Abstract

The invention discloses a two-way floating butterfly valve. The two-way floating butterfly valve comprises a valve body provided with a valve port. A butterfly plate used for opening or closing the valve port is rotatably arranged at the valve port. A valve seat sealing ring in seal fit with the butterfly plate is arranged on one side of the valve port. An elastic butting piece used for tightly pressing the valve seat sealing ring on the butterfly plate when the butterfly plate is closed is arranged on the valve body. The floating performance of the valve seat sealing ring is good, and after sliding, the valve seat sealing ring can restore to be attached to the butterfly plate, so that good airtightness is maintained by the valve seat sealing ring.

Description

technical field [0001] The invention relates to a bidirectional floating butterfly valve. Background technique [0002] Butterfly valve is a kind of valve which uses disc type opening and closing parts to turn back and forth about 90° to open, close or adjust the flow of medium. Butterfly valve is not only simple in structure, small in size, light in weight, low in material consumption, small in installation size, small in driving torque, easy and fast in operation, but also has good flow regulation function and closing and sealing characteristics at the same time, so butterfly valves are widely used In many fields such as petroleum, chemical industry, metallurgy, hydropower, etc., the existing butterfly valve usually has a valve port, the valve port is provided with a butterfly plate for opening and closing the valve port, and the valve port is also provided with a valve seat sealing ring , the valve seat sealing ring fits with the butterfly plate when the valve port is cl...

AI Technical Summary

Problems solved by technology

However, the pressure that the existing valve seat sealing ring can withstand is small, and when the impact force of the fluid received is large, the valve seat sealing ring is prone to slippage

However, because the existing butterfly plate is fixed in the valve body, and the floating performance of the valve seat sealing ring is poor, the valve seat sealing ring will be staggered with the butterfly plate after slipping, so that it cannot be kept in contact with the butterfly plate. In turn, the sealing performance of the butterfly valve is deteriorated, and when the slippage of the seat seal ring is too large, the gasket and the seat seal ring will be separated, so that the gasket cannot seal the gap between the seat seal ring and the valve port. The gap between the gaskets is sealed, so that the sealing performance of the butterfly valve is deteriorated, and after the seat seal ring changes in thermal expansion and cold contraction volume, the gasket may also make it impossible for the seat seal ring to connect with the valve port. The gap between them is normally sealed so that the sealing performance of the butterfly valve is deteriorated

Therefore, the sealing stability of the gasket in the existing butterfly valve is poor, and it cannot form a good seal for the gap between the valve seat sealing ring and the valve port.

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