April 2026 — Prom-nasos.com.ua

Chemical pumps with magnetic coupling are used for pumping aggressive substances, acids, alkalis, and solvents. Manufactured from high-quality materials resistant to corrosion and aggressive chemicals, they ensure high performance, reliability, and safety. The operating principle of the pump is that the magnetic coupling transmits torque from the motor to the pump shaft through a magnetic field, eliminating any contact between the working parts. This reduces friction and wear of components, which extends the service life of the pump. When selecting a pump, it is important to consider the needs of your production process, the nature of the working fluids, and other important parameters. MD pumps from the manufacturer Qeehua have proven to be reliable. To select the correct pump, it is necessary to know: the substance that the pump will transfer; capacity; head (delivery height). The material from which the pump is made depends on what exactly will be pumped. For example: nitric acid (HNO3) 20%. To select a pump, we review the compatibility table of pump materials with this acid. In Table 1 we can see that if the temperature of HNO3 is 40°C, GFRPP and CFRPP (types of polypropylene) are suitable. However, if the temperature is already 60–80°C, PVDF and CFRETFE should be used (a more chemically resistant version of PVDF). Table 1

The electric motor of a borehole pump , unlike a standard asynchronous electric motor with air cooling, has certain features. Due to the fact that it is located in a borehole, its diameter has certain limitations — it cannot be larger than the borehole itself. In addition, this motor is constantly under water, therefore it must be hermetically sealed. Borehole pump motors are divided into two main groups: oil-filled; water-filled. In the first case, the motor is filled with a special oil (lubricant), most often a petroleum jelly–based lubricant or another dielectric liquid that ensures its cooling. Water-filled motors are cooled by water, while the winding wire of the electric motor is coated with PVC. The tightness of the motor at the point where the drive shaft exits is ensured by a mechanical seal and additionally by a gland seal. In both cases, cooling is provided by the water pumped by the pump. Water is drawn into the pump section at a certain velocity. The velocity depends on the pump capacity and the difference between the diameters of the motor and the borehole – (Dс-dн) The detailed specifications of the borehole pump motor indicate the minimum water flow velocity along the motor housing required to ensure reliable cooling. On average, the water velocity should be more than 8 cm per second. Therefore, as can be seen from the illustration above, when selecting a borehole pump it is necessary to consider the borehole diameter, pump capacity, and the diameter of the pump itself. Our company’s managers are ready to help you choose a pump according to your needs!

A borehole (deep-well) pump is a special type of pumping equipment designed to extract water from deep artesian wells and boreholes. Another method of use is operating the pump as a high-pressure pump for supplying water from pools and reservoirs in a horizontal position, provided that an additional cooling jacket and a support base are used. Until recently, the most popular pumps in our country were the ECV brand pumps, which were produced at two factories – Kherson Electromechanical Plant and Azovenergomas (Berdyansk). At present, it is practically impossible to find a new ECV pump in Ukraine. The Ukrainian market is saturated with borehole pumps from various manufacturers — European, Turkish, and Chinese. Our company is no exception; for several years we have been supplying borehole pumps from the Chinese manufacturer Deep-Well-Pump . The main priority is pumps for 4-inch wells ( pumps of the 4SD, 4SS series ) and 6-inch wells ( pumps of the 6SR series ). The new 6SR pump series is designed as a full replacement for ECV 6 pumps with similar characteristics. The number “6” in the ECV pump marking indicates the minimum well diameter in which this pump can be operated, namely 6 inches, which corresponds to 150 mm. The pump itself actually has a smaller diameter, about 138 mm (see photo). The difference between the diameters of the pump (especially the electric motor) and the well itself is very important. First, the pump must freely pass into the casing pipe to a great depth, and at the same time it should not have too small a diameter. The fact is that when the difference in diameters is large, the gap between the casing pipe wall and the electric motor housing increases, which results in poorer motor cooling. In many cases, a 6-inch ECV pump can be replaced with a 4-inch pump if the pump operates periodically and its hydraulic parameters meet the required values. In this case, the electric motor will not have time to overheat if it operates for 15–30 minutes. However, if the pump operates continuously in a deep well and the well diameter where it is installed is from 150 to 200 mm, a 6-inch pump is necessary. Our company offers high-quality and reliable borehole pumps for wells with a diameter of 6 inches. Since we are direct importers, the pumps are available directly in our warehouse. Our managers are ready to ship the equipment to you on the day of payment! Main advantages and features of the 6SR pump series Designed for wells with a diameter of 6 inches or more; Capacity from 6 to 40 m³/h; Head from 40 to 300 m of water column; Electric motor in stainless steel AISI304 design; Motor flange dimensions according to NEMA standards; Discharge outlet thread according to ISO 228/1 (cylindrical pipe thread); 6SR electric motor – oil-filled, rewindable; Maximum immersion depth below the water level – 90 m; Maximum well depth – up to 250 m; Continuous duty operation – S1.