A check valve allows the medium to pass in one direction, during which 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 here. Some applications require a quick shutdown to instantly protect components. However, other applications require slow closing to prevent water hammer.
Hanwel supplies check valves that meet these requirements and ensure optimum control.
- Providing an effective seal with minimal counter pressure
- A quick response to loss of flow
- Ensuring minimum resistance to upward flow
- Having as many maintenance-free components as possible
- Causing as little vibration and noise as possible during closing
- Preventing water hammer
Most piping systems require the use of at least one check valve to maintain flow in one direction. This criterion is necessary to prevent contamination of media in the system and/or 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.