A Check Valve is a mechanical device that limits or prevents the flow of fluids or gases through a pipe. They are generally self-operated valves that allow one direction of flow and prevent the opposite flow. Different types of check valves are suitable for different applications. Some features to consider when choosing a Check Valve include cost, ease of use, maintenance requirements, piping orientation, and process media.
Check valves are a common component of plumbing systems. These valves ensure that fluids flow in one direction only. They typically have two ports, one on the inlet side, the other on the outlet. They work by using the concept of differential pressure. When the pressure on the outlet side is greater than the pressure on the inlet side, the valve mechanism closes and prevents backflow. Check valves are available in various forms, including diaphragm valves.
Some Check Valve models include an inline spring loaded type that works in low pressure relief applications. These types may utilize elastomeric, thermoplastic, or metal-to-metal seals. They come in a variety of materials, including stainless steel, Inconel, and titanium. The properties of these materials affect how the valve performs.
Check valves can also be divided into two types. The spring-assisted type will automatically return the doors to the closed position when upstream pressure is greater than the pressure in the downstream line.
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