Through conduit gate valves are manufactured with full port and outside stem & yoke designs. And double block and bleed and high robustness are standard features of the valve seat. With the low fluid resistance, through conduit gate valves can be widely used in geothermal, steam, natural gas, oil pipelines and storage devices, and also applied as reliable bilateral cut-off devices on pipelines for petroleum products, gas, corrosive media like acid and alkali, etc.