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That would be your flush valve in the tank
since check valve holds water in the line can a hand pump be installed between the check valve and water tank?
Back water valve
Check valves can go bad, however I can't imagine where you'd have a check valve in a normal hot water system.
Checks the flow of the water
The brine valve is located in the brine tank in the 3 inch tube. Systems with brass control valves prior to the year 2000 do not have a brine valve in the tank. the air check is performed by the tri guard. ( clear plastic thing with the ball in attached to the valve body)
clear, if your water is cloudy then you might want to check your filter
The check valve is a directional valve. Hot water needs to be piped from the top of the tank to the fixture, because that is where the hottest water in the tank is. If a return line is tied into the bottom of the tank, a directional valve (check valve) should be installed between the heater and the pump. That's what they taught me don't know if it really matter upstream or down stream. If you don't have a check valve the water could flow through the return line to the fixture instead of through the supply pipe and the water at the fixture might not be hot enough.
Check AC drain and clear the blockage. Also look for firewall sealer skips.
A foot valve, in relation to a water well, is a check valve at he bottom of a well to keep the water from running back into the well from the pump when the pump is not running. If the check valve does not hold the water the pump will lose it's prime and will not pump water.
water water
There is no effective way to check it without hooking up water and electricity.There is no effective way to check it without hooking up water and electricity.