What do those model nos mean-D371X, D371F, D71F

Belo Valve is one professional Chinese manufacturer for high quality wafer type concentric butterfly valves, like manual lever wafer center line butterfly valve, electric wafer center line butterfly valve, pneumatic wafer center line butterfly valve, rubber lined soft sealing wafer butterfly valve, PTFE lined soft sealing wafer butterfly valves, lug type butterfly valves, metal hard sealing butterfly valves, flange butterfly valves, eccentric butterfly valves, double eccentric butterfly valves, triple eccentric butterfly valves, etc. Each butterfly valve product has undergone strict three-level(first inspection, patrol inspection, final inspection) inspection before leaving the factory, and each butterfly valve has undergone a standard pressure test before leaving the factory. The pressure test operator will also inspect the appearance of the butterfly valve during the pressure test to ensure that every butterfly valve which is going to leave the factory is a high quality product; 

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Today we are going to show you what those model no means in butterfly valves, like D71X, D371X,D971X,D371F4.