Also known as non-return, one-way, and clack valves, check valves are different from other types of valves in their ability to pass fluid in solely one direction. This sort of function is essential for a variety of safety applications, as well as for preventing overflow.
How Check Valves Function
Operating on a two-port system, check valves have an opening where fluid or gas is drawn in to the first port. It is then regulated by a mechanism separating the two ports that allows water to be drawn from the first to the second port and out an opening without allowing fluids to reenter the first port.
Types of Check Valves
Ball Check Valve – This check valve uses a ball covering a round opening to separate the first and second port. When fluid is drawn in, the ball is pushed forward. When the fluid is pushed back, the ball is pressed into the round opening, which creates a seal and allows all fluid to flow out the second port in the intended direction.
Swing Check Valve – One of the most common types of valves, a swing check valve is used inside household toilet tanks, as well as in many other areas. Instead of a ball controlling flow, this valve uses a small door on hinges that opens when water is drawn in and closes when the flow of water is stopped, thereby not allowing any fluid to drain out of the valve’s entrance. This type of valve is also sometimes referred to as a tilting disc check valve.
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