A check valve allows the medium to pass in one direction only, where the medium both opens the valve (when passing the valve in the flow direction) and closes it in the case of backflow or loss of pressure. Check valves are often used as a safety measure to prevent the medium from flowing back to critical components such as pumps.
A number of aspects are essential while sizing the right check valve. Whereas some applications require a fast shutdown to instantly protect critical components, other applications require a slow closing to prevent water hammer.
Hanwel supplies various check valves that meet these requirements and ensure optimum control of your system
- Check valves provide an effective seal with minimal counter pressure
- Check valves allow a quick response to loss of flow
- Check valves ensure minimum resistance to upward flow
- Check valves are to have as many maintenance-free components as possible
- Check valves are to cause as little vibration and noise as possible
- Check valves are to prevent water hammer
Most piping systems require the use of at least one check valve to maintain the flow in one direction. This function is necessary to prevent contamination of media in the system and/or to prevent damage to critical components.
For example, pumps can be protected with a check valve against the backflow of the medium after pump failure. Although it is often thought that this is a standard function that can be performed by basic valves, this often turns out to be a costly misconception. Hazards such as water hammer, with all its consequences, are lurking.