February 17, 2017
High pressure units must be selected very carefully. Since the purchased and installed their own hands to pump properly selected operating parameters besides that will not give the expected results, but also will soon fail. Therefore, when choosing a high-pressure pump, consider these points:
The required amount of water per day just for your family; the flow rate of the well (as a source of demand from a larger amount of water using a powerful pump stupid) are important. In addition, a careful approach is to know the diameter of the pump. This is especially true of narrow wells. It is unlikely that you will be able to install their own hands a pump into the narrow hole. And the money will be spent.
However, when choosing the right product, you need to rely not only on the brand and price, but also on other indicators. For example, you need to know in advance the required performance and the pressure of the model, these indicators should calculate in advance. Independently of this it is better not to do, and refer to specialists, who are engaged in it professionally.
But it’s best to choose the branded showrooms where there is a large selection. The consultants will help you choose the right professional pump model. In addition, in these outlets you will be given a guarantee on selected goods.
High pressure water pumps are designed for different purposes. Depending on their needs and financial expectations, you can always choose the most appropriate decision for your needs.
Ways to regulate the pump pressure
The pump pressure may be controlled via a frequency converter (pressure decreases simultaneously with the application). This method of pressure control is the most economically feasible, because it allows the pump to operate without a significant reduction in efficiency, despite a decrease in supply. As a rule, a strong drop in efficiency occurs only at very sharp (less than 30% of the nominal value) decrease in speed. Another way to control the pressure by reducing the pump shaft speed – use of gear, but it leads to a sharp decrease in the efficiency of the unit.
Throttling – pressure reducing method by reducing the cross section of the pressure (after the pump) or suction (to pump) line with a valve, or gate valve. Reducing the pressure line section drastically reduces the efficiency of the pump, since he continues to work at full capacity, and part of it is useless pressure is extinguished in a reduction of the section line. Reducing the suction line cross section is not so greatly reduces efficiency, but further creates a vacuum at the pump inlet, which can cause cavitation.
Bypass – (by pass – bypassing) – method of regulating the supply and pressure of the pump. It is to install a regulated or unregulated bypass (bypass) from the pressure line to the suction. With respect to the pump – this is analogous to decrease the resistance, i.e. It is going head loss. In relation to consumer network – is similarly reducing supply. As a result, the operating point (QH) will shift abruptly downwards, ie you can get in a consumer network at the same time lower pressure and lower supply (power fluid goes to reset). Bypass dramatically reduces the efficiency of the pump unit.