Design differences of non-return valves and check valves For non-return valves the simplest design is the swing valve, with a weighted flap which is held open by forward flowing water. If flow reverses it closes under its weight and is kept shut by backpressure acting on the closed flap. The wafer flap valve is a slimmer version of the same design. Other designs include the tilted plate NRV and the ball NRV. Non return valves - Matrix Process SolutionsThe LKC-2 non-return valves prevent the reverse flow of fluids and are specially designed for use in stainless steel pipe installations. These standard non-return valves are widely used in various processes throughout the sanitary industry and are safe and highly reliable.
What is a non-return valve? The main function of a non-return valve (NRV), otherwise known as stop or check valve, is to allow steam flow in one direction, and automatically prevent backflow. In other words, they prevent steam from flowing back to the main header of the boiler, or back to a boiler that has failed or is off-line. Non-Return Valves wittgasNon-return valves are also known as gas back-flow valves or check valves. WITT gas non-return valves can be installed in any orientation. They are available with various connections, in brass or stainless steel, and can be used for all technical gases such as