Comparison Svityaz 4QGD1.2-50-0.37 vs Werk 4QGD1.2-50-0.37

The maximum amount of water that the pump can deliver from the well per unit of time. The choice for this parameter depends on two main points: the maximum total consumption and productivity of the well.

The maximum total consumption is the amount of water that is necessary for the simultaneous normal operation of all points of water intake in the system. Different types of consumers (washbasins, showers, washing machines, etc.) require different amounts of water; exact values can be found in special tables or instructions for specific models of household appliances. And the total consumption can be calculated by adding the indicators of all points of water intake. As for the productivity of the well, this is the maximum amount of water that the well can produce in a certain time without draining it. This indicator is usually indicated in the documents for the well; if it is unknown, before buying a permanent pump, it is imperative to determine the productivity — for example, by trial pumping with an inexpensive unit.

Accordingly, the performance of the pump should not exceed the productivity of the well, and it should be at least 50% of the maximum total consumption of the connected water supply system. The first rule allows you to avoid draining the pump and the troubles associated with it, and compliance with the second guarantees a normal amount of water even with a rather intensive water intake. And, of course, do not forget that high performance requires high power and affects the cost of the device.

The highest pressure that can occur in the line when the pump is running. Note that usually we are not talking about normal working pressure (it is described by max. head, see above), but about short-term jumps that can significantly exceed standard values. The water supply system to which the pump is connected must normally tolerate not only standard values but also the mentioned jumps — otherwise, an accident may occur. Accordingly, the maximum working pressure is useful for assessing how the safety factor of pipes, fittings and other elements of the system corresponds to the characteristics of the pump.

The greatest depth under water at which the pump is capable of operating normally.

The optimal location for the deep well pump is as close to the bottom as possible (no closer than 1 m, but this margin can be ignored in this case). It is worth choosing according to the maximum depth, taking into account the depth of the well and the static water level in it (the distance at which the water mirror is located from the surface of the earth when the pump is turned off). For example, there is a well 50 m deep with a static level of 20 m; thus, the depth to the bottom is 50 – 20 = 30 m, and if you want to lower the pump to the very bottom, the maximum immersion depth must be at least 30 m — otherwise too high water pressure may damage the unit.

The largest amount of mechanical impurities in the pumped water, which the pump can handle normally. When used with dirty water, this parameter should be taken into account along with the maximum particle size (see above): if the impurity content is too high, the pump may fail even if the individual particle size does not exceed the norm.

To avoid overheating of the engine, deep well pumps are equipped with a special thermal relay. When it detects a heating temperature above the norm, it automatically turns off the motor, preventing it from failing.

In this case, the country of origin refers to the country from which the product brand originates. A brand, in turn, is a general designation by which the products of a particular company are known in the market. The country of its origin does not always coincide with the actual place of production of the device: to reduce the cost of production, many modern companies transfer it to other countries. It is quite normal for products, for example, of an American or German brand, to be made in Taiwan or Turkey. Contrary to popular belief, this in itself does not lead to a decrease in the quality of the goods — it all depends on how carefully the brand owner controls the production. And many companies, especially large and "famous", monitor the quality very zealously — after all, their reputation depends on it. However, the range on the market is not so great. In addition to East European pumps, there are models from Italy and China.

The material from which the pump impeller is made.

A wide variety of materials are used in modern well pumps. However, the manufacturer, usually, chooses the option so that the strength, reliability, resistance to pollution and other key features of the wheel correspond to the required characteristics of the pump and its level as a whole. In addition, the same material may have several varieties that differ markedly in characteristics; this is especially true for technopolymers and thermoplastics, but most metallic materials such as stainless steel or brass also come in several grades. All this means that when choosing a pump, it makes sense to look first of all at performance characteristics, price category, reviews and other practically significant information, and the material of the impeller is of secondary importance.