My Davey pump has been pumping in rapid succession even though all taps are not flowing.
Each time I disconnect the pump from the pipes and then reconnect it back, the problem will be gone for a while...
Hello, W/D here.
Air can get trapped in the casing of the pump, but usually it winds up in the pressure tank. With too much air in the tank, it is considered air logged. Conversely, an insufficient amount of air in the tank creates a waterlogged scenario. Both conditions can cause the pump to be erratic.
If your tank is equipped with a bladder in it, the issue with insufficient air is avoided. If you have a bladder in the tank, there will be a schrader (bicycle type) valve at the top of it. Those that I have seen are set at 28 psi, with no pressure on the tank. This provides the cushion of air to pressure the water out of the tank and into the system. Otherwise, tanks are equipped with an air injection system that puts a bit of air into the tank every time the pump cycles. If the tank has no air, or very little air, there is insufficient compressible cushion for the tank to move the water.
Air trapped in the pump causes cavitation, where the efficiency of the pump is greatly reduced. The remedy for this is to crack a high point vent on the pump, with it running, and allow the air to escape. You should be careful not to remove a fitting so far that it comes out completely. The aim is to crack it just enough for air to escape. Tighten the fitting back up when air escaping is followed by water.
Frequent cycling can also be caused by damaged internals inside the well proper. Ususally, some water is forced down the well, through a venturi, and then comes back to the pump and tank. By passing through the venturi, a vacuum is created at the foot of the well, and water is sucked in through the foot valve. A damaged foot valve will allow water to return to the water table, causing you to lose water pressure. Let the pump reach it's shut-off pressure and then block (close) the discharge valve. Watch the pressure gauge. If the pressure gauge falls, the problem is on the well side, provided there are no piping leaks. If, after 10 minutes or so, the pressure is holding, open the discharge valve. If the pressure than falls, the issue is on the house side of the valve. Some things that people tend to forget in figuring water usage is leaking toilets and outdoor faucets, icemakers, and other water using appliances (or leaks).
Bleed the air off of your pump. Check your type of air volume control, and adjust if needed. Block the discharge valve, and determine which side the issue is on, and go from there. If you do not have the type of tank with the bladder in it, I highly recommend them. It takes so many problems out of the equation that they are well worth the money, in my very humble opinion.
Well, that's about all I can think of to help you. Best regards, --W/D--
Feb 24, 2011 |