What to do if the water pressure in the faucet is poor? The problem of cold water from a hot tap. Summary

Part 1

A1. The figure shows a graph of the dependence of the projection of the body's velocity on time.

The projection of the acceleration of the body in the time interval from 12 to 16 s is represented by the graph:

A2. Bar magnet mass m brought to a massive steel plate with a mass M. Compare the force of the magnet on the stove F 1 with plate action force on magnet F 2 .

1) F 1 = F 2 ; 2) F 1 > F 2 ; 3) F 1 < F 2 ; 4) F 1 / F 2 = m/M.

A3. When moving along a horizontal surface, a sliding friction force of 10 N acts on a body with a mass of 40 kg. What will be the sliding friction force after a decrease in body weight by 5 times if the friction coefficient does not change?

1) 1 N; 2) 2 N; 3) 4 N; 4) 8 N.

A4. A car and a truck are moving at speeds υ 1 = 108 km/h and υ 2 = 54 km/h. Car weight m= 1000 kg. What is the mass of the truck if the ratio of the momentum of the truck to the momentum of the car is 1.5?

1) 3000 kg; 2) 4500 kg; 3) 1500 kg; 4) 1000 kg.

A5. Sledge weight m pulled uphill at a constant speed. When the sled rises to the top h from the initial position, their total mechanical energy is:

1) will not change;

2) increase by mgh;

3) will be unknown, because the slope of the hill is not set;

4) will be unknown, because the coefficient of friction is not set.

1) 1; 2) 2; 3) 1/4; 4) 4.

According to the FIPI website http://www.fipi.ru. Instructions for completing the work of the Unified State Exam-2009, the criteria for evaluating solutions to problems of part 3 for 1 and 2 points, the conditions for recording the solution of tasks, as well as another option, see No. 3/09. - Ed.

When water does not flow well from the mixer, you can deal with the problem only by knowing what caused the poor pressure. Weak pressure makes it impossible to fully use the shower or bath. Problems with water significantly reduce the comfort of living, so it is impossible to fully enjoy the benefits of civilization.

Causes affecting the water pressure in the faucet

To eliminate a malfunction that leads to a violation of the pressure or its complete absence, you need to understand why the water from the tap does not flow well.

Most often, the problem lies in the following circumstances:

1. Faucet blockage. A decrease in pressure and a decrease in the water jet occurs due to clogging of the aerator, which is an insert and filters water. Confirmation of this breakdown theory is such a violation as a decrease in pressure in only one mixer, when other taps in the house are working normally.
2. The formation of cork from rust, particles of silt and scale in the pipe. A gradual decrease in pressure in this situation can lead to a complete blockage of the throughput diameter of the connecting filter or the pipeline fitting itself.
3. Reducing the pressure of the water supply in the water main. The problem may be at the level of the pumping station. It is also possible to depressurize the pipeline.
4. Incorrect calculations when designing a water main. For example, during the laying, pipes of a larger diameter were used than the one that was used on neighboring branches; a large length of water pipes, which does not correspond to the capabilities of pressure equipment.

The drop in pressure of both hot and cold water can be caused by factors such as the simultaneous consumption of liquid in large quantities. As a rule, under such circumstances, the water does not flow well in the evening, when the bulk of the inhabitants of the area return home.

Solving pressure problems

If the pressure drops or the water does not flow at all, you can try to find out the cause of the malfunction yourself, and then fix it. It is worth noting that not all breakdowns can be repaired by yourself. In case of accidents at the station, depressurization of the pipeline and similar reasons, the relevant competent services are involved in the repair.

You can try to clean the clogged section of the pipe from the riser to the valve with a special cable. When the water does not flow well from the neighbors below and above, it can be argued that the riser is clogged. It is almost impossible to clean it. It is to be replaced.

All repairs are carried out after the water is shut off.

If the faucet itself is clogged, the mixer can be cleaned. This will require a wrench. With it, you need to unscrew the aerator. Due to the fact that the aerator has small nozzles, it clogs quickly. To clean the aerator, you need to substitute it under running water and rinse it. When the problem is not in the aerator, you will need to dismantle the valve and unscrew the lock washer that holds the locking element in the housing seat, and get to the axle box and remove it. Next, the body is cleaned of scale, plaque, etc. When everything is finished, you will need to assemble everything in the reverse order.

If the problem appeared in the shower and after cleaning the faucet there is still no hot water, you will need to clean the sprayer. It is dismantled using an adjustable wrench, after which it is placed in a saucepan and filled with water, and then placed on the stove. Add vinegar or citric acid to the water. You don't need to boil. An acidic environment is detrimental to plaque and other deposits that have formed on the sprayer. After cleaning, the sprayer must be rinsed under running water and reinstalled.

If the problem is not in the mixer, but in the water pipes, then it is better to contact a specialist (locksmith, plumber).

In order to fix the problem of poor water pressure yourself, you will need:

• shut off the water;
• dismantle the plug of the coarse filter;
• remove and rinse the wire cassette.

The filter element is returned to its place and the plug is screwed using a special tape for sealing. If the cause was not a clogged coarse filter, it can be assumed that the failure of the fine cleaning system was to blame.

After disconnecting from the water supply, it is necessary to check the pressure in the free pipe. To do this, open the central valve. If everything is normal, the liner is replaced and the filter glass is washed from the accumulated dirt, and then everything is mounted in its original place.

When none of the above helps, you can try flushing the pipes under pressure. To do this, turn off the water with a valve located near the filter, unscrew the flexible hoses or the mixer, if it is wall-mounted.

Water will flow from the pipes, which must be sent to the sewer or a pre-prepared container (basin, bucket). Pipe cleaning is recommended to be done with an assistant. It will take sharply for 1-2 seconds to open and close the valve.

Weak pressure in the faucet can piss off even the most balanced homeowner. After all, the duration of filling the kettle or coffee maker, and the performance of the washing machine or dishwasher depend on the pressure.

In addition, with poor pressure, it is almost impossible to use either the toilet or the shower or bath. In a word, if there is no pressure in the tap, then the house will not have the comfort of living.

We understand the causes of low water pressure in the tap

What weakens the pressure of water in the faucet?

Why a weak water pressure in a tap can ruin even the happiest life, even in the most perfect house or apartment, we have already discussed with you. However, moaning will not help grief. Moreover, this problem is not as terrible as it seems. One has only to understand what has weakened the pressure, and you will get an almost ready-made recipe for eliminating this trouble.

At the same time, the list of TOP 3 reasons for the drop in pressure of hot or cold water is as follows:

• Clogged faucet . In this case, the intensity of the water jet is weakened by a cork made of rust and scale, which clogged the aerator, filter insert (mesh) or bushing. Moreover, only one tap in the house suffers from this problem. That is, if your tap water is not flowing well, for example, in the kitchen, but there are no problems in the bathroom, then you will have to disassemble and clean the problematic point of consumption.
• . In this case, the same particles of silt, rust or scale are to blame. Only now they block not the faucet aerator or the faucet mesh, but the filter built into the water supply. In the worst case, such deposits can block the flow diameter of the connecting fitting or the pipe fitting itself.
• . In this case, the cause of the weakening may be either a failure at the level of the pumping station, or a depressurization of the pipeline. Failure at the station can only be corrected by repair crews of utilities. The indicator of this breakdown is the lack of water in the entire microdistrict. Loss of tightness is diagnosed visually - by a stream of water spouting from the body of plumbing fittings. Any locksmith from a service company can fix this breakdown.
• In addition, speaking about the reasons for the weakening of pressure, it is necessary to mention possible miscalculations in the arrangement of a specific water supply line . Incorrect diameter (larger than the previous branch), excessive length (not matching the characteristics of the pressure equipment) - these are the main reasons for the pressure drop in the new water supply network.

If you don’t want to deal with them, order a water supply project from professionals.

Well, now that you already know the reasons for the drop in pressure in the tap, it's time to figure out how to eliminate this defect in the water supply.

What to do if cold and hot water from the tap does not flow well?

It all depends on the cause of the pressure drop.

For example, if your faucet is clogged, you will need to do the following:

Removing the faucet aerator for cleaning

• Take an adjustable wrench and twist it off the "spout" of the crane - Foaming jet of water nozzle. This part has very small nozzles. Therefore, aerators are clogged with a frequency of once every six months. And if we are talking about a mixer tap with hot / cold water, then the frequency of cleaning the nozzles is reduced to 2-3 months. The dismantled aerator is washed under running water.
• If the aerator is clean and the water is weak, you will have to dive even deeper into the faucet design. . Indeed, in this case, you need to get close to the locking unit - the box. To do this, dismantle the valve (faucet handle) and unscrew the lock washer holding the locking element in the body seat. Next, you remove the shut-off assembly from the housing and clean off silt or scale deposits from its surface. In the final, you will have to assemble the crane, acting in reverse.

Before dismantling the shut-off valve assembly, be sure to turn off the water supply by closing the water valve closest to the point of consumption. Otherwise, you will flood the entire apartment.

• If the source of the problem is not the faucet, but the “sprayer” in the shower or bathroom, you will have to proceed a little differently. First shut off the supply to the atomizer. Then remove it from the rack or metal hose using an adjustable wrench. Immerse the removed part of the atomizer in a saucepan of vinegar. Heat up this medium on a hot plate. Wash off the scale with water. Put the nozzle back in place.

If the smell of vinegar irritates you, try a 10% citric acid solution. To prepare it, it is enough to dissolve 100 grams of dry acid powder - it is sold in any confectionery department - in a liter of water.

If you do not have the desire to mess with the crane - call a locksmith from the management company. He will solve this problem right before your eyes.

What to do if the water pressure in the tap is poor, we hope you already understand.

Now let's move on to pipes:

• First of all, turn off the water by turning the central valve near the meter.
• Next, dismantle the plug of the coarse filter. Remove the wire cassette and wash it in a container. Then return the filter element to its place, renew the seal and screw the plug.
• After the revision of the coarse filter, proceed to check the fine filter system. First, disconnect it from the water supply and check the pressure in the free pipe by slightly opening the central valve. If everything is in order, change the liner, simultaneously washing the filter glass from particles of accumulated dirt. In the final, everything, of course, is mounted in its original place.
• If the filters are clean, and the water still does not come out of the tap with the proper force, then the cause of the drop in pressure is a blockage in the pipes themselves. Localization of this problem and its elimination is an extremely time-consuming task. Therefore, after unsuccessfully cleaning the filters, you will have to call the management company and report a problem with the patency of the pipes in the water supply.

If you did not change the wiring of the water supply system in the apartment, the management company will pay for cleaning the pipes. After all, it is she who should monitor the performance of "native" engineering communications.