A swing check valve is a flow control instrument that prevents liquids or solids from entering another area of the unit. It can be activated manually or mechanically and can work with springs to allow unrestricted flow. Different types are used to equalize pressure and are made of plastic, rubber, steel, or other metals. Examples include toilet mechanisms and grain silos.
A swing check valve is a flow control instrument that contains a type of closure panel that rotates in one direction on a hinge. The valve itself can be connected to various other chambers and pipes to prevent liquids or solids from entering another area of the unit, and this is achieved by the actual weight of the material applying pressure and sealing the barrier in place or the force to open. Normally, a swing check valve is activated by a manual or mechanical source which allows the barrier to lift and expel the contents, but they can also be designed to expel all materials from within a chamber and prevent them from re-entering as well.
One of the more common applications of a swing check valve can be seen by removing the lid from a toilet and inspecting the mechanism that prevents water from entering the lower tank. By design, the combined weight of the liquid inside the toilet prevents the valve from flushing water, but when you apply less pressure to the flush lever, you raise the rubber stopper high enough for the flushing process . The swing check valve then remains open until the area is almost completely free of liquid, and after the pressure has been fully released, the valve swings back into position to restart the process. Another practical example of this technology would be the release mechanism inside a fire extinguisher.
Another type of swing check valve works with the aid of springs to allow unrestricted flow of liquids or solids, such as the type found inside a grain silo. When processed items are discharged into the main chamber, a large swing check valve does not attempt to regulate the amount of product entering the lower zone; as long as the movement of the grain is constant, the valve remains open and does not attempt to close. After the influx of materials drastically slows or ceases, the spring mechanism has sufficient force to activate and seal the valve chamber to prevent stored grains from escaping.
Other types of swing check valves are used in various configurations to equalize pressure on both sides of a mechanism and to prevent internal gas buildup or other stresses on the equipment. A smaller swing check valve that is not needed to withstand large amounts of pressure is normally constructed of plastic or rubber. Those that take on more demanding heavy-duty uses are constructed of steel or various other metals.
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