Our wafer-type knife gate valve is designed for shutoff in systems with high levels of suspended solids and is ideal for sludge treatment, heavy oils, non-flammable liquids, water treatment, chemical plants, mining, and cement plants. It has very low pressure drop when fully open, is easy to operate, and is relatively lightweight. The valve is designed to open and close slowly to prevent water hammer.
It is essentially an external spindle valve operated by an upward-moving threaded spindle connected to a stainless steel gate or guillotine that moves up and down as the valve is operated, providing a visual indication of the valve’s position and allowing the spindle to be lubricated. A fixed spindle nut, located at the top of the bridge, allows the assembly (gate and spindle) to move up and down simultaneously. It has a body cast in a single piece with internal guides to guide the gate, which prevents the accumulation of solids during closure.
The valve is only used for applications that require a fully open or fully closed position; otherwise, vibrations may occur, gradually eroding the gate and the seat.
Our valve provides high flow rates with low pressure drops; it features wedges to help the disc seal against the body and seat, and the disc has rounded edges that protect the seat seal and packing.
Multiple options and design combinations regarding the valve type (bidirectional, unidirectional…), the actuation type (handwheel, lever, , pneumatic, etc.), the body material (GG25, GGG40, GGG50, CF8M, etc.), the disc material (AISI 304L stainless steel, AISI 316L…), the material of the packing (Synt+PTFE+NBR, Synt+PTFE+EPDM, graphite…), and the material of the seat (metal-to-metal, EPDM, NBR, FKM (Viton®), silicone…).
