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By pexpipeman, 10/11/2010

Circulating pumps are called machines, which pumped air or gas from the production vessel at a pressure below atmospheric pressure and compressing it, pushed into the atmosphere. According to the principle of all the Circulating pumps can be divided into the following types:
1. Displacement pumps, which action is based on increasing volume.
2. Molecular pumps, whose operation is based on the entrapment of gas molecules moving surface.
3. Ejector and diffusion pumps. Their action is based on the capture of gas particles with a steam jet.
4. Water jet pump, whose action is based on trapping molecules of the gas tap.
5. Ion pumps, whose operation is based on the increase of charged gas particles by an electric field.
The table below shows the main parameters of Circulating pumps, manufactured by industry.

Taco 007 Circulating pumps are widely used in the chemical industry in those processes where a pressure of about 5 – 100 mm Hg. Art. These pumps are reliable and easy to maintain and can pump gases containing droplet.

Rotary oil pumps are also quite common in the chemical industry. They apply in cases where you must create a pressure about 0.5 – 0,001 mm. Hg. Art. These pumps can be used as a forevacuum for pumping large volumes of air from atmospheric pressure. These pumps can be used in chemical processes such as drying, distillation, etc. In this case, the pump has a special gazoballastnoe device. Rotary oil pumps require more care and do not let water, water-soluble acids and alkalis in the working chamber of the pump.

Rotational Circulating pumps with sliding plates are mainly used to remove the bulk of air or gas from the production capacities of large volumes, as well as to create centralized systems of pre-dilution in the chemical industry. Rotational Circulating pumps with liquid piston are widespread in the chemical industry. These pumps are simple devices and services, durable, can be applied in all processes of chemical technology, where a pressure of about 25-600 mm Hg. Art. They are indispensable in the case of compression of gases that do not allow contact with the grease, flammable at low temperature or light sparking and for other special conditions.

Steam jet Circulating pumps are mainly used in the chemical industries, where the pressure must be of the order of 1-100 mm Hg. Art. Pumps of this type are finding increasing applications in the chemical industry. A distinctive feature of these pumps is that they have no moving parts and the main working mechanism of a jet of steam.

Diffusion Circulating pumps, in which the working mechanism of a jet of mercury vapor or oil, used mainly in laboratory practice to obtain a pressure of about 2×10-6 – 3×10-7 mm. Hg. Art. These pumps can operate at pressures

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By pexpipeman, 07/09/2010

Vertical multistage centrifugal pumps, Grundfos CR 4-80 Modern autonomous heating cottages and country houses is difficult to imagine without the circulation and seal-less pumps. Today, more than half of all used worldwide circulation pumps made by Grundfos (Denmark). Among the main requirements for the circulating pumps, the following: quiet operation, low power consumption, long service life, maintenance-free operation, low cost.

The unique ceramic bearing circulators UPS Company of the 100 series provides GRUNDFOS than silence, more and unsurpassed durability. Because ceramic has a higher than steel and graphite hardness and more stable geometric dimensions of temperature changes.

Most cottages are equipped with heating thermostats. When using circulating water flow in the system is constantly changing. A strong decrease in flow in the system shifts the operating point in the area of high pressure, which leads to a significant pressure drop in the expansion valve. This raises an unpleasant noise. The question arises, what pressure should develop the pump, so as not to move “noise” threshold. It was noted that significant noise in the temperature control occurs at a pressure drop of more than 2 m.

So, to get rid of noise, it is necessary to reduce the pressure of the pump in the area of small flow. This task is very competent Grundfos Alpha – pump with proportional control of pressure (the lower the consumption of the system, the lower and pump head). Proportional regulation in such a pump is driven by built-in electronic control system and its frequency rotate. After start using additional configuration Pump Grundfos Alpha is not required, but if you want an adjustable tilt of its characteristics can be changed using the rotary knob on the terminal.

In addition to getting rid of noise in the system, pumps, Grundfos Alpha and have another important quality – low power consumption. Compared with unregulated circulating pumps of the same capacity at low cost energy savings up to 50%.

Circulating Pumps Grundfos UPS Series 100 is considered to be the most reliable in the world. Now with the advent of Grundfos Alpha to their traditional advantages (monolithic protective stainless steel sleeve with no additional rubber seals and the system of ceramic bearings), add new ones. Convenient plug will greatly facilitate the electrical pump, because this will now not need to open the terminal box. A green light will signal the feed voltage

If we talk about the cost of pumps GRUNDFOS Alpha, then it is only 25-30% higher than for the corresponding unregulated pumps. But this is a new circulating pump.