... , Tieling Valve Works was reformed. We are the largest manufacturing base of low pressure big diameter valves and penstocks ... high-tech enterprise.The main products : butterfly valves, gate valves, check valves, air release valves, rotating strainers, comb type ... 01Mpa~2.5Mpa; Nominal diameters: DN50-DN3000; actuating methods: manual, motor, pneumatic, hydraulic, motor and hydraulic types. wafer type ...