Solar pool heater panels that are roof mounted may use check valves on the supply and return pipes. Check valves are not normally used on aboveground pools, which have their equipment located below water level, in what is called ‘flooded suction’. This ensures fast pump priming for long motor life, and also prevents pool filters from back flowing DE or dirt to the pool, when the pump is off. Pump check valves help inground pool pumps to catch prime quickly, by keeping the water in the pump and filter, when the pump shuts off. Another option is to move the pump further back from the incoming valves, and/or reconfigure the suction manifold, to add more horizontal pipe space for mounting a single check valve, between the pump and any suction line valves. Installing PVC Unions directly beneath a vertical check valve will overcome the problem, and allow full winterization of the suction lines. There also is the concern of water being trapped on top of a vertically mounted check valve. When doing so however, you will need to install check valves on all vertical suction pipes, unless one pipe normally has a closed valve, like a spa drain pipe.įor pools that winterize their system during winter, placing check valves on vertical suction lines prevents air from being blown backwards through the skimmer and main drain pipes. If space is not available for a check valve on the horizontal pipe that comes into the pump, check valves can be installed on the vertical suction lines, or the skimmer and main drain pipes. This allows not only a full basket, but also a full pipe of water. For best results with pump priming, especially for pumps lifting more than 24” from the water surface, the check valve should not be installed directly against the pump intake, but 12”-18” in front of the pump. ![]() ![]() As such, a common location for a check valve is on the incoming suction pipe, in front of the filter pump. The most common use for a check valve is to hold the water in the pump when the motor shuts off. There are other uses for pool check valves, see below. They are also used to keep raised spas, fountains or solar heaters full of water, when the pump shuts off, again to prevent gravity draining. ![]() The purpose of a check valve is to force water in a pipe to flow in one direction only, and also to prevent gravity draining of water in the filter, pump and pipes, when the pump shuts off.
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