What exactly is a compressor and how does it function in practice?

High pressure compressor in Pakistan

A compressor is a mechanism that increases the High pressure compressor in Pakistan and thus the energy of a gas, usually air. By compressing and thereby pressurizing atmospheric air, the air compressor converts current (from an electric motor) into kinetic energy.

For example, a compressor is the opposite of an air diffuser. To recapture compressed air from the environment, a pump must be used.

To compare, compressed air is composed of two gas molecules (nitrogen + oxygen). It has energy. This energy is speeding up as the molecule heats up. When you compress air, the temperature rises and the molecules travel faster. When you inflate a balloon, this happens. The air is High pressure compressor in Pakistan in a tiny container. If you open the balloon’s orifice, the air will be released, and the compressed energy will cause the balloon to soar.

Compressor types

The piston compressor is the most popular on the market due to its modest size and mobility. Often used for pleasure, such as DIY, it is also found in the automobile, construction, and metallurgical industries. They are available with an oil-free compressor, a silencer, wheels or a vertical tank, as well as an ultra-compact variant that fits into any car trunk.

A reciprocating compressor works in a compression cycle with working and idle phases. This compressor uses one or more pistons to pump air vertically back and forth.

  • High-pressure compressors
  • Bar Blue
  • Compressors with 10 bar Blue Series PRO
  • PRO Green 11 bar
  • K14 series
  • Compressors

It is less common than the piston compressor. But it’s quite common in industries that need more efficient, continuous machinery. The screw compressor is a sophisticated, highly resistant machine that will supply a big amount of air while saving energy.

We at Airpress appreciate the lifespan of an oil-lubricated compressor and only provide lubricated variants. According to the activity, it is advised to complete the installation with filters that remove all oil, water, and dust particles.

Finally, a screw compressor works without pistons, but with screw blocks that turn on to entrain air into the system and therefore compress it.

What is a compressor?

A piston compressor is made up of cylinders and pistons. They reciprocate inside the cylinder. By depressing the piston, a vacuum is created, sucking in air, reducing the volume of air in the cylinder chamber. The cylinder’s air will be compressed.

The piston unit has two lamellae-connected valves. A suction valve and a discharge valve. The slats will then alternately open to let in or out air. The intake valve opens when the piston retracts, creating a vacuum. The suction stroke is the result. Suction valve closes and discharge valve opens to evacuate compressed air into compressor vessel. The cycle will continue until the tank pressure reaches the desired level.

High pressure compressor in Pakistan
High pressure compressor in Pakistan

Compressor pump parts include:

  • Cylinder
  • Ring piston
  • Link rod
  • Slats or inlet/outlet valves
  • Crankshaft
  • Piston
  • Cylinder
  • Filter

Compressions are done in stages, up to four. Airpress’ compressors only have one or two stages. Single-stage engines use cylinders and pistons of the same diameter, with compression taking place in the block’s chamber. Two-stage compressors operate differently. The intake air is pre-compressed to 3-4 bars in the low pressure cylinder. Next, the compressed air is transferred to the second stage for another compression to the compressor’s nominal pressure (from 8 to 14 bars).

This unit represents the level of an industrial air compressor. The number of bars ranges from 7 to 14 depending on the compressor. Compressors with a maximum pressure of 7 to 10 bar usually have only one compression setting.

  • Two-stage compression benefits
  • Interference-resistant
  • Higher HP/KW efficiency
  • End-pressure rise


There is a repeating theme in compressor operation. Is the compressor oil lubricated? An oil-free compressor indicates that the pump is oil-free, and that none of these components require lubrication. With an oil-lubricated compressor, the cylinder walls and bearings are lubricated with oil. Thus, oil is vital in maintaining compressor performance by reducing component friction.

But it will also assist battle external aggressors that can significantly harm the compressor, like ammonia from breeding farms. Even if the oil and air are separated in the cylinder by rings on the piston, small oil particles may mix with the air. So, depending on the application, it is best to use an oil-free compressor or add a filter to the compression system. Also, use a food-grade oil certified for the food sector. Above all, it’s vital to change the oil periodically to keep it fresh.


When choosing a piston compressor, choose one with a tank that meets your needs. This is crucial since the tank’s capacity affects the compressor’s operation. The larger the compressor tank, the less often it needs to resume compression cycles. If you need to compress air frequently and your compressor has a tiny tank, it will need to run and compress more frequently. This will accelerate the compressor’s degeneration.

What is a pressure reducer?

We typically refer to a compressor’s maximum and working pressures when discussing its features. While the former represents the compressor’s maximum pressure rate, it is also necessary to know the working pressure. The operational pressure (or cut-in pressure) of a compressor is the pressure remaining after the first compressor cycle. In other words, when the compressor reaches a lower pressure (usually 2 bars lower than the maximum pressure), it starts a new compression cycle to get back to the maximum. The operating pressure is also used with pneumatic tools, indicating the optimal operating pressure.

Thus, the working pressure may vary depending on the tool used. The user must be able to adjust the pressure to their liking. Here comes the pressure regulator or reducer. Always connect a pressure gauge to the compressor outlet, directly after the reducer. The reducer allows the use of air compressed by the compressor at lower pressures than the maximum.

Why use a pressure switch?

A pressure switch controls the pressure in a closed system, like a compressor. The pressure switch not only allows the gadget to run without human supervision, but also warns of any pressure overload hazard.

The pressure switch is usually pre-set at the factory. A user can also make a specific request to a competent service. When the compressor reaches the set pressure, it stops pumping. Auto-restart when minimal pressure is regained.

If the pressure switch is damaged, the compressor may stop working. Consider these points when changing the pressure switch:

  • Compressor max pressure
  • Heating (only direct compressor 400V) (3 phases)
  • alimentation (230V or 400V)

What is the difference between a combustion engine and an electric motor?

There are compressors with a combustion engine, which means they run on gasoline or diesel. One benefit of this type of compressor is that it does not require a plug or a cable to operate. So they can work in areas where access to electricity is difficult or impossible. A combustion compressor is thus much more mobile. Another benefit of these compressors is that they can be used as electricity generators. It can be used to power tools if needed.

So, how does a compressor function with a car? The attached animation shows a gasoline engine’s cycle of operation (spark ignition).

The piston drops, sucking in air and fuel (with diesel only air is suck in, while fuel injection occurs when the piston approaches its top dead center). The inlet opens while the outlet closes.

The piston compresses the air-fuel mixture. Close both valves. The spark plug ignites as the piston approaches TDC. Diesel engines automatically ignite by compressing the air-fuel combination to extreme pressure.

The combustion chamber explodes, pushing the piston to its lower dead centre, where it transfers the energy to the crankshaft via the connecting rod. Close both valves.

Exhaust stroke: The exhaust valve opens, and the piston returns to TDC.

Now that we know how a compressor works, let’s look at how to turn it on.

Using an Air Compressor

In this article, we will look at how to use a compressor and how to get it up and running as soon as you bring it home. So, only the first start of a piston compressor for home use will be considered.

Starting a compressor may appear difficult at first. Nothing is simpler than an Air press compressor. To make your job even easier, we’ve included numerous videos that show you everything from unboxing to turning on and off your compressor for the first time.

Compressor unpacking

Your Air press compressor arrives well-protected in a cardboard box with impact guards. Please take caution when taking the compressor from its carton and gently slide it out to avoid a shock.

Inspect the device immediately after removing it from the box (the manufacturer’s declaration can help). Smaller oil lubricate compressors come with a separate bottle of oil. Larger compressors already have enough oil in the reservoir.

Compressor wheel and vibration damper assembly

Each compressor’s wheel and anti-vibration damper assembly may be slightly different. Overall, the method is similar and straightforward.


The wheel bundle includes two flat washers, a bolt, and a metal ring. To begin, place the first washer directly on the thread shank of the bolt as it exits the wheel hole. Set the wheel on the compressor’s foot. Then the second flat washer, the metal ring, and lastly the nut. The arrangement of the washers and nut prevents vibration from releasing the bolt. Rep for the second wheel.

Tighten the nuts with a size 17 wrench. To make it even easier, put a second wrench on the bolt head and only tighten the nut.

High pressure compressor in Pakistan
High pressure compressor in Pakistan


There is only one shock absorber in our example, but your compressor may have many. Repeat the procedure as many times as you have shock absorbers. Find the vibration damper on your compressor. Then just put the shock absorber in the hole provided.

Unplug the compressor and check the oil level

On lubricate versions, you will locate a transport plugin the oil tank High pressure compressor in Pakistan. In order to prevent oil leaks during transit, this plug is not the final plug. It must never be use during compressor operation. Not intended for this application, it may cause harm or injury if not replaced.

Larger compressors use pre-filled tanks. Then check for leaks and that the level is still adequate. If you need more oil, add it.

Filling up with oil is simple. Remove the shipping cover and carefully pour oil into the hole, watching the oil indicator on the reservoir. Less lubrication than the red mark. Pouring the oil is easier with a funnel. Finish with an oil plug and a vent. The cap is usually crimson or black (see photos below). This prevents boiling oil from splashing during compressor operation. The breather, or air bleeder, is use to remove excess pressure from the tank during oil heating. The oil cap comes in a bag with a handbook.

Install the compressor air filter

A air filter may be require depending on the compressor model. Then repeat the process as needed.  The shipping cap prevents dust and other particles from entering the gadget. Take it out.

Our air filters come in a variety of sizes and shapes, but they are all easy to install. The filters have a specific thread that goes into the hole, as shown in the video below. These have two cylinders. The compressor has two air filters that must be install.

Quick couplings and a compressor pressure reducer

Almost all Airpress reciprocating compressors, especially those for home use, have universal fast connections. These fittings are use to connect pneumatic hoses to your compressor, whether Euro or Orion (ARO 210).

A compressor usually features a fast coupling to utilise air at the desired operating pressure. Ours comes with two fast couplings. You can use the pressure reducer to work with the operating pressure. The second quick coupling connects directly to the tank, allowing you to operate directly with the tank’s pressure. Locate the safety valve to identify the tank-to-tank connection (red cap with ring).

By Travis Mann

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