Swing type is the one of the check valves (name also clack valve, non-return valve or one-way valve). Check valves’ main function is to allow fluid (liquid or gas) to flow through it in only one direction. Therefore, there are some technology features of each type.
A swing check valve has a butterfly shape, where the disc, the movable part used to block the flow, that is why it swings on a hinge or trunnion, either onto the seat to block reverse flow or off the seat to allow forward flow. The seat opening cross-section may be perpendicular to the centerline between the two ports or at an angle.
Turbulence and pressure drop within the valve are very low what makes them more demanded. The next reason why this type of valves is widespread in industrial application is that swing check valves allows full, unobstructed flow and automatically closes as pressure decreases. These valves are fully closed when the flow reaches zero and prevent back flow.
Swing check valves can be presented in various sizes (depending on customers’ requirements), however, this type of industrial valves is large. It is available in either Y-pattern or straight body design. However, in either style, the disk and hinge are suspended from the body by means of a hinge pin. Composition disks are usually recommended for services where dirt or other particles may be present in the fluid, where noise is objectionable, or where positive shutoff is required.
Swing check valve is high claimed by different industries, their used in chemical, power plants, in water treatment process and in other ones. Another application feature of swing check valve (as the other types) is often using when multiple gases are mixed into one gas stream. In this situation, one-way valve is installed on each of the individual gas streams to prevent gases mixing and as a result to prevent technogenic accident. Try to imagine what role check valves play in industrial process when fuel and an oxidizer are to be mixed. They are used to ensure that the original gas cylinders remain pure and therefore nonflammable.
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