High-Pressure Pumps
High-pressure pumps are specialized units that increase the pressure of liquids to significant levels, usually more than 400 bar, at the moment of discharge from the pump.
Major Manufacturers of High-Pressure Pumps
Among the leading manufacturers of high-pressure pumps are:
- Moyno
- Brinkmann Pumps
- BHDT
- BFT
- GEA
Radial-Piston Pumps
This type of pump is used in mechanisms that operate under high pressure (400-700 bar). They are produced in various configurations that differ by key elements:
- Excentering Shaft: in the first pump variant, the rotating excentering shaft causes radial-oscillating movements of the piston.
- Excentering Cylinder Block: in the second case, the pump has a piston that rotates inside a solid outer ring. The excentering provides the movement of the pistons.
Many pumps in this category have an odd number of pistons to reduce the pulsations of the liquid flow.
Gear Pumps
Gear pumps are usually used in pressurized lubrication systems for circulating oil under pressure in internal combustion engines and other machines. They are also applied in power steering systems to create necessary pressure differentials in the system.
This type of pump is often combined with other units that can also operate under high pressures. For example, gear pumps can be integrated with radial-piston pumps. The rotors of these pumps are integrated inside, making the equipment more compact. Such dual devices are often used for rapid transportation in tension systems and large presses.
In the stationary stator, which is located inside, there is one more tooth than in the rotating rotor, leading to the contraction and expansion of variable volume chambers due to the planetary gear of the rotor. The dimensions of the main moving element – the wheel – affect the pump's flow rate and also depend on other factors. The movement of the liquid in centrifugal high-pressure pumps occurs due to several impellers arranged one after another.
The rotational energy of the key element is transformed into pressure. Unlike centrifugal pumps, which cannot operate effectively with increased pressure, gear pumps have several speed variants, allowing for significant pressure characteristics in mechanisms.