Wholesale Knife Gate Valve MDQ MODEL Uni-directional wafer style knife gate valve for general industrial applications The MDQ model knife gate is a uni-directional wafer valve designed for general industrial service applications. The design of the body and seat assures non-clogging shutoff on suspended solids in industries such as: 路 Pulp and Paper 路 Power plants 路 Wastewater treatment plants 路 Chemical plants 路 Food and Beverage 路 Bulk handling 路 Mining Sizes DN 50 to DN 1200 (larger diameters on request) Working pressure DN 50 to DN 250: 10 bar DN 300 to DN 400: 6 bar DN 450: 5 bar DN 500 to DN 600: 4 bar DN 700 to DN 1200: 2 bar