4" ASME Class 150/300# RF Wafer Nozzle Check Valve, Carbon Steel Body, 316 SS Disc, 316 SS Spring with 25% Glass Filled Teflon Seat. Steel and PTFE

Champion Valves Modern NZW Axial Style Nozzle Check Valve Steel DesignThe 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 pressureis called the "cracking" pressure. Once the NZW’s disc opens, flow velocity determines the position and stability of the disc.Features:Unique, patent-pending laminar flow design of our NZW combines optimal Cv with minimal slam characteristics.The NZW axial flow pattern, developed through Computational Fluid Dynamics (CFD), creates a disc contour that provides minimal energy loss and low ΔP.Easy face-mounted seat assembly allows full maintenance access to all components with no leak paths in the valve body.Dynamically engineered molded seat design provides secure, bubble-tight seal using a variety of elastomer materials, along with a 316 SS option that is integral to the valve face.Internally mounted compression spring is designed for reliable operation for the lifetime of the valve.The uniquely engineered valve disc shaft and replaceable bushing allow pass through of potentially damaging particulates.Suitable for Liquid, Steam and Gas ServiceSingle Cast Body Design for High Quality Performance and Reliability