Screw Tech Engineering Pvt. Ltd. Manufactures Knife Edge Slide Gate Valve. The Knife Edge Slide Gate Valve is an Industrial Valve. The design ensures minimum contact between the parts of the valve, reduces the wear and tear. The high performance Knife Gate Valves feature non sliding motion, avoid sliding contact between bodies and gate allows flushing of media form the valve interior. Screw Tech Engineering Pvt. Ltd. Is the manufacturer of Material Handling Systems in Screw Conveyors, Rotary Feeders, Rotary Airlock Valves, etc.