Check valves introduction
For water supply and wastewater treatment.
When choosing a check valve, it is important to make a cost-benefit analysis on a specific system. The goal is to frequently cut cost while also achieving the possible lowest pressure. In short, when it comes to check valves, a higher safety equates to a higher level of pressure loss.
Where do we use check valves?
Check valves are installed in pipelines to prevent backflow. A check valves is basically a one-way valve in which the flow can run freely one-way, but if the flow runs, the valve will close to correct the piping, other valves and pumps. Water hammer may happen if the flow reverses and there is no check valve in place. A pipeline or other components can easily be damaged by water hammer which frequently occurs with great power.
In HVAC (heating, ventilation, and air conditioning) systems, check valves are also frequently utilized. Large structures where coolant is pumped many storeys up are one setting where HVAC systems are used. It is ensured that the coolant does not flush back down by installing these check valves.
What are the different types of check valves?
AVK offers check valves in any size for different applications, all designed and manufactured in-house based on long experience within the water and wastewater industry. Check valves come in a variety such as Swing check valves, ball check valves, tilted disc check valves, slanted seat check valves, nozzle check valves and silent check valves all available from AVK.
The most common type of check valves for water and wastewater are swing check valves and ball check valves:
Swing check valves has a disc that is positioned on a swing check valve and swings on a shaft or hinge. When forward flow is required, the disc swings off the seat. While in reverse flow, the disc swings back onto the seat, blocking it. The valve's shut-off characteristics are influenced by the disc's weight and the return flow.
Ball check valves contain a ball that slides up and down inside the check valve is how it operates. To seal and stop a reverse flow, the seat is machined to fit the ball, and the chamber is formed conically to help the ball enter the seat.
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