This series of dust and gas valve design and manufacture according to the nature and characteristics of the dusty gas for coal dust, clean gas, flue gas and other dusty gas pipeline as a control and regulation purposes. The valves are widely used in metallurgy, chemical industry, machinery, cement, gas pipeline and power industries and environmental protection, dust removal facilities systems. This series of dust and gas valve operating torque, hoist speed, long service life, the valve sealing parts made ​​of high strength material with good abrasion and erosion of high performance features. Connecting flange dimensions conform to GB2555-81PN2.5 standards. Detection methods conform to Q / SF · J101-91 standards.