The traditional metal hard seal butterfly valve is used to realize the on-off and flow control components of the pipeline system, and it is extremely widely used in many fields such as petroleum, chemical industry, metallurgy, hydropower and so on. In the known butterfly valve technology, the sealing form is a sealing structure, and the sealing material is rubber or polytetrafluoroethylene.…

The valve is in a half-open state, and the experimental medium is completely injected into the valve and the valve cavity. Then close the valve and open the valve body relief valve to allow excess test fluid to escape from the valve cavity test port. …

The flat gate valve with diversion hole is installed on the pipeline, and the pig can be used for pigging directly.…