At present, fire butterfly valves are widely used, such as general drainage and fire system pipes. In general, such a fire butterfly valve needs to have the advantages of simple structure, reliable sealing, light opening and convenient maintenance. Mae'r canlynol yn gyflwyniad byr i'r.

3 、 Cwmpas y defnydd
dan amgylchiadau arferol, hynfalf glöyn byw
at present, the fire butterfly valve is widely used. The main material selection is the material selection of the valve body and the valve shaft. Mewn llawer o systemau ymladd tân, mae'rfalf