Factory production of valve products are: electric, hydraulic, pneumatic blind valve (plug plate valve); Three eccentric metal hard seal butterfly valve, dust and gas butterfly valve, regulating butterfly valve; Ball valve, ash relief valve, explosion relief (safety) valve, slurry valve, water seal backcheck valve, three-way switch valve, gas block valve, top release valve, pressure equaling valve, pressure regulating valve group, blast furnace probe and hoist, etc. Through the optimization design specially for the BLAST furnace gas residual pressure generation unit (TRT) system, the electric and hydraulic fully closed plug plate valve, quick cut off valve, by-pass valve and other supporting products are developed and produced, and used by (TRT) system. Stable and reliable performance, belongs to the third generation of products.