Valve Know How: Selecting a Check Valve
What is a Check Valve?
A check valve is a simple self-acting device used to prevent reverse flow in a pipeline.
Understanding the best way to select a Check Valve
When it comes to choosing the correct valve, several factors need to be considered such as media type, temperature, pressure and flow rates. Correct selection will ensure valve longevity and prevent wear and water hammer.
When the fluid media is either clean/potable water or wastewater/sewage T-T Flow have several options to choose from.
Clean / Potable Water Check Valves
For clean or potable (also known as drinking) water valves with a mechanism within the flow can be used. Economical solutions such as twin-plate, axial (spring loaded) or swing check valves should be used. These are all available with third-party WRAS approval for use within UK water distribution networks. For more demanding applications tilting disc or nozzle check valves should be considered.
Waste Water and Sewage Check Valves
For wastewater or sewage applications valves without mechanisms in the flow path must be selected. Generally, most suited are either swing or ball check valves. The ball check has the advantage over the swing check due to its compactness and self-cleaning ability reducing maintenance. For more demanding applications recoil check valves should be considered.