It is unknown whether everyone knows that the connection between the butterfly valve and the valve stem is pin free, which effectively solves the problem of internal leakage. As for the coating of butterfly valve, it can be sprayed according to customer requirements, such as nylon or PTFE. 　　

The system uses a closed sprinkler as a temperature detector to detect fire. The diameter of the transmission pipe is 25 mm for wet type and 15 mm for dry type. When any sprinkler in the transmission pipe system starts spraying water and causes the water pressure in the transmission pipe to decrease, the deluge valve can be opened automatically, but the transmission pipe must be higher than the deluge valve; In order to prevent the influence of hydrostatic pressure on the slow opening of deluge valve, the hydrostatic pressure of wet drive pipe shall not exceed 1/4 of the water pressure in front of deluge valve; Electric control device with fire detector.