Well pumps for pumping exhibit excellent technical characteristics. But often, even the most reliable units are subject to breakage. On why the pumps do not pump water, and will be discussed in this article.

Faults and the reasons for their elimination

The main defects household pumps are:

• cavitation;
• lack of power;
• overcurrent;
• for deposits;
• water hammer;
• gain at the noise.

Cavitation is a process when the pump pumps water from the air. There are several reasons that lead to this:

• clogged vent and the supply pipe;
• presence of gas particles or air in water;
• set long pipe for sucking liquid;
• pump operation with increased load on the right side.

Clogged pipes are cleaned. Inspect the unit hydraulics. If there is clogging it is cleaned. If possible, change the pipe to products with a large diameter.

The problem of air content in water is achieved by:

• deep immersion into water unit;
• fixing the baffle plate (prevent ingress of water jets on the portion near the pump).

To reduce loads on one side of the device is carried out resistance increases in the discharge pipe. This is done by assembling or installation of additional knee pipe with a smaller diameter.

Insufficient capacity when the pump pumps water bad, can be caused by:

• incorrect rotation of the pump (typical for 3-phase products);
• damage or blockage of the impeller;
• flow blockage or jamming of the check valve;
• presence of air particles in the pumped water;
• misalignment valve on the discharge pipe.

tool rotation direction is changed by the proper connection of the two phases on the power cord. The source of impeller failure usually act corrosion and abrasive wear. To fix it only by replacing the damaged parts. When clogging and jamming of the pump mechanism carried thoroughly cleaned. The valve, which is located on the discharge line must be fully open.

The main causes of the excess current in the pump are:

• voltage drop in the electrical network;
• increased viscosity of the fluid for pumping;
• increase of engine temperature;
• off one of the phases.

Eliminating these faults by means of:

• constant check indicator in the mains voltage:
• fitting impeller having a smaller diameter;
• limiting the number of stops and starts;
• a thorough inspection of contacts for connection of the cable;
• replacement of fuse failure.

Blockage of the flow conduit and the pump sediments occurs when:

• it is a constant switching device when pumping a small amount of water;
• reduced velocity of the fluid.

Fix this problem by specifying the new parameters on the control unit or by changing the height of the water level when starting the pump.

The occurrence of water hammer is associated with:

• appearance of air pockets in the pipes;
• frequent start the pump;
• pumping large volumes of water at the time of inclusion;
• rapid output unit in the operating mode.

To avoid or reduce the occurrence of water hammer can be by:

• fitting vent at the top of the pipe;
• checking pipe diameter and the working point of the pump to their correspondence velocity water movement;
• use soft start frequency;
• optimal settings for the parameters on the control unit.

The increase in noise during the functioning of the pump does not directly affect the amount of water pumped water. But this fact suggests that some time other malfunctions will appear. And they can lead to the fact that the pump will not be able to swing water. After all, the causes of the occurrence of increased noise are completely different, ranging from the blockage of the ventilation pipe or the line and ending with the effect of corrosion on the impeller.

Arising problems with the operation of two types of pumps

Among the deep pumps intended for use in everyday life, the most popular aggregates are the "kid" and "Agidel".

The main reasons are the "Kid" pump does not pump water, can be:

• shock absorber;
• rubber valve wear;
• stem scope.

The shock absorbent is explained by the weakening of the fastening of two nuts. They are placed on top of the shock absorber on the rod. Return to normal operation of the pump is achieved with the help of its disassembly and twisting of the nuts until it stops.

The rubber valve is wearing when sand penetrates with water into the pump. Valve replacement occurs also when disassembling the unit. Sometimes the cause of the lack of water can be hit by a valve of one small pebble. As a result, the valve cannot close. After removing the pebble and adjust the valve pump will operate in normal mode.

If there is damage or deformation of the rod, you will have to resort to the purchase of new equipment.

One possible malfunction when the pump "Agidel" does not pump water, is the wear of the gland. In this case, it should be replaced. This process is carried out in the following sequence:

• covers cover covers;
• unscrewed the electric motor case;
• rubber gasket is removed;
• a nut is unscrewed, which fastens the impeller to the body;
• removed from the tree anchor and bearing;
• deleted old and put a new gland.

Disassembly nuances and pump work

Some requirements may be followed when disassembling deep pumps. These include:

• the gap between the magnetic system and the piston of 4-5 mm;
• the integrity of the valve and piston;
• the clearance between the valve (is located near the suction holes) and the body of 0.7-0.8 mm.

It should be noted that the functioning of the pump without water is even a short time can cause its combustion. As a result of the overheating of the equipment, the magnet is peeled and the gap between it and the piston disappears. After that, it becomes impossible to move the movement of the piston.

Pump repair video: