Metanoia company, due to its extensive communication network with different countries, has a sales representative of a compressor manufacturing company. These companies are one of the largest manufacturers in this field, which claims to compete with European manufacturers with similar quality but lower prices. Below you can see the catalogs and resume of this company.


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Compressed and low-volume air has many uses in many industries today, and there are many devices that operate with air power. Various types of compressors are devices that are responsible for providing compressed air and have a special place in many industries. In fact, these devices can draw in air with a large initial volume quickly and with high suction power, and then take it out after compression.

A compressor is actually a device that can increase the pressure in these devices by reducing the volume of fluids and condensing them.

Basically, this device can suck air with high speed and power by using a primary energy, which is mechanical energy, and due to the type of design and program it has, it can be compressed and dense and finally transferred to the condenser. .

The process of condensing gas in compressors causes the air temperature to rise significantly; For this reason, cooling pipes are used in the gas exit from the compressor. The gas produced by compressors can supply the energy required by various devices in various industries. The compressor device, which was first discovered and invented in 1875, is known today as one of the main industrial and non-industrial equipment that has many applications.


Since air compressors have many industrial, semi-industrial and non-industrial applications, they are also produced in different types, each of which can perform their specific tasks correctly. Among the most important types of compressors, the following can be mentioned:

  • Variable speed or speed
  • Suction pressure, heat and capacity
  • Division based on drive motor
  • Division based on the number of work steps
  • Division based on the way of work and performance
  • Division based on oil spraying and lubrication method

 In fact, the most important and main factor for categorizing and dividing all types of compressors is the way they work and function, based on which these devices are divided into two main categories: positive displacement compressors and dynamic compressors.


Positive Displacement Compressor


Positive displacement compressors are basically a type of compressors that use a reciprocating component such as a piston, diaphragm, or vane to condense air and gas. These devices work with constant flow rate and are independent of output pressure. The reason for naming these compressors is that they compress the working environment by moving the volume of the compressor cylinder. It should be noted that these systems work based on the displacement principle and have many advantages such as high quality, reliable adaptability, excellent reliability, etc.


Positive displacement compressors can also be divided into several different categories, the most important of which include the following:

  • Spiral compressors
  • Diaphragm compressors
  • Reciprocating compressors
  • Scroll or scroll compressors
  • Vane or rotary compressors
  • And…

Each of these compressors has specific advantages and disadvantages and has different applications, but it can be said that piston compressors are the best positive displacement compressors, which have fewer disadvantages compared to the other mentioned compressors.


What are the advantages and disadvantages of positive displacement compressor?

Positive displacement compressors have many industrial and non-industrial applications and for this reason they have a high variety. Among the most important advantages of this type of compressors can be summarized in the following:

  • Good and positive efficiency and performance
  • Low production cost of these compressors
  • High pressure in this type of gas or air compressor
  • Simplicity of the manufacturing process of positive displacement compressor parts
  • High diversity in terms of design, price, application, power and different features
  • And…

This type of compressor, like any other device, along with all the advantages it has, also has disadvantages, some of which we will mention below:

  • Requires a lot of care and maintenance
  • High initial purchase price of these compressors
  • The limited capacity of the positive displacement compressor
  • Creating a lot of noise and sound pollution in the work environment
  • Not suitable for high flow rate and not providing proper efficiency
  • Low durability and the need for constant maintenance

Types of compressors?




Dynamic compressors are also called devices that have blades that rotate at a very high speed. In this type of compressor, the air is sucked between the rotating blades of the propeller and increases the speed. Finally, the gas or air is discharged from the diffuser, which converts the kinetic energy of the air or gas into pressure. It should be noted that dynamic compressors are usually used for high flow rates and can have many applications in different industries. These compressors have different types, the most important of which are axial compressors, centrifugal or centrifugal compressors, and turbo compressors.


Advantages and disadvantages of dynamic compressors

Today, these compressors are used in many industries and have many applications. Among the most important advantages of dynamic compressors, the following can be mentioned:

  • Low friction and high durability
  • Suitable for industrial uses requiring high pressure
  • Using less parts in the design and construction of dynamic compressors
  • Low level of machine vibration and no need for foundation
  • High efficiency and efficiency compared to positive displacement compressors
  • Low maintenance cost compared to positive displacement compressors

Along with all the advantages mentioned for these compressors, these devices can also have disadvantages, the most important of which can be summarized in the following cases:

  • High initial cost of these compressors
  • Not covering low capacities similar to domestic capacity
  • Complexity of the control panel of the dynamic compressor and its high sensitivity

Application of the compressor

Due to their efficiency and performance, compressors can be used in many industries. Basically, the use of compressors is common in all dynamic and active industries and is known as an essential element. Among the most important applications of this equipment, the following can be mentioned:

  • Use in petrochemical industries
  • Use in pneumatic tools
  • Use in power plants
  • Use in aviation industry and jet engine
  • Use in the gas industry and the transmission of its pipelines
  • Use in the production of all kinds of cooling and heating equipment
  • Use in the automotive industry as well as aircraft and submarine cabins
  • Use in various construction and production industries as well as heavy machinery

Compressor buying guide


As mentioned, compressors are checked based on various factors and parameters and are divided into different types. Naturally, each of them can have unique features and capabilities. To buy a compressor, it is necessary to pay attention to various points and parameters in order to finally experience a good wisdom; The most important of these are:

  • The first and most important point in buying a compressor is the type of project in which the compressor is used; In fact, the type of project determines how much compressed air is needed.
  • The second point is the amount of power or power of the compressor, which is evaluated based on the HP or horsepower unit; Usually, these devices have powers between 1.5 and 15 horsepower.
  • Remember that the required air pressure should be checked; Because many industrial equipments require at least 90 PSI pressure.
  • The volume of air produced, which is indicated by the CFM unit, is of great importance, and usually a capacity of 3-4 CFM should be considered for each horsepower at a pressure of 90 PSI.
  • The size of the compressor is very important; Although it will not affect the performance of the device; The size of the compressor should be selected based on the type of project requirement.
  • The way the compressor works (single-stage or multi-stage) is also very important; Because each of these compressors can create different pressure
  • The need or lack of oil is one of the most important points that you should pay attention to when choosing and buying a compressor; Because oil-free compressors are cheaper, lighter and less expensive, and oil-based compressors have a longer lifespan and higher durability.
  • Having the ability to carry, duration of operation, access to compressor parts, amount of noise production, etc. are other factors that you need to pay attention to when choosing an air compressor.

Factors affecting the price of the compressor?


Today, there are more than a dozen different types of compressors, each of which can have different features, capabilities and applications. For this reason, their price can also be affected by various factors. Among the most important factors determining the price of the compressor, the following can be mentioned:

  • Price and currency fluctuations
  • Compressor production quality
  • Type of compressor in terms of performance
  • Compressor warranty period
  • Compressor cooling system
  • Compressor brand and company
  • Physical characteristics of the compressor, such as power, capacity, pressure, dimensions and size