There are two types of Non Return Valve: swing check valve and spring check valve. Both are available in brass or stainless steel, a material that suits a variety of materials, be it liquid or gas. You can select different valves of different sizes to get the best solution for your requirement. Swing Check Valve Swing check valves are used in a variety of applications, including sewage and wastewater treatment, firefighting, energy facilities, and home items. One of the most common examples of this non return valve application is allows water to enter a toilet tank while preventing reverse flow. …Read more!