When the float switch activates the pump, the pump is forced to push water through the valve and out the discharge pipe. When the water level falls, the float switch notifies the pump to halt, so stopping the flow of water. The water in the discharge pipe is subsequently drained back into the pit by gravity.
The check valve prevents the pump from having to pump the same quantity of water twice. The elimination of this problem will reduce electricity expenses.
A sump with short cycling occurs when the pump turns on and off too quickly or frequently. Short cycling increases the temperature of the pump motor. Heat is the enemy of electric motors and can dramatically reduce the lifespan of a sump pump. By installing a check valve, the possibility of short cycling will be reduced, especially in smaller sump basins. A check valve will save you money and increase the life of the sump pump.
The optimal location for a sump pump check valve is between 8 inches above the pump’s output and 12 inches above the floor. Installation above the floor level facilitates examination, maintenance, and replacement of the valve. Installing a check valve 6″ above the pump discharge when the pump is mounted inside the sump basin allows for the drilling of air release or weep holes to prevent air lock for sump pumps without an integrated air lock prevention mechanism.
Always refer to the manufacturer’s installation instructions for the sump pump.
If a normal gravity closing valve is installed, installing the sump check valve in the sump basin below the cover can lessen the noise created by water hammer; but, inspections and maintenance are not nearly as straightforward.
Incorrect Installation or Failure to Install
In the absence of a sump pump check valve, the water in the output line will flow back into the sump pump pit. This causes the water level in the sump pit to rise, and a high water level can require the pump to operate more frequently, resulting in higher energy expenses.
If the check valve is installed incorrectly, such as too high on the discharge pipe, the pump will empty the pit during the run cycle, but when it shuts off, the water below the check valve will drain back into the basin, causing the water level to rapidly rise. When this occurs, it will activate the float switch to restart the pump immediately, causing your pump to wear out prematurely.
There are three primary types of sump pump check valves, as depicted in the images below. Each type is available in numerous sizes and connection configurations.
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