Champion Valves Wafer-Style Axial Flow Check Valve

The Champion Valves, Inc. (“CVI”) Model NZW Axial Flow Nozzle Check Valve (NZW) is a self-operating check valve designed to prevent the backflow of gas or liquid media. The valve permits flow in one direction while preventing flow in the other direction. Initial opening of the NZW’s disc begins when the upstream pressure of a pumping system exceeds the downstream pressure and the effective torque of the spring. This pressure is called the “cracking” pressure. Once the NZW’s disc opens, flow velocity determines the position and stability of the disc. If the flow velocity upstream of the NZW decreases and/or stops, the internally housed spring forces the disc to a closed position. Ideally, the disc will be fully closed just prior to flow reversal, thus alleviating the potential for water hammer.