hydraulic pump failure symptoms

Air Hydraulic Pump How It Works?

You will get to see many workshop environments, and industrial and Field service units rely on air hydraulic pumps. The system usually works as an air piston by performing a suction stroke. Afterward, the high-pressure piston sucks all the fluids and works accordingly.

We know compressed air is a valid source of power. This system not only stimulates energy, but also provides a lot of benefits to machines, vehicles, and so on. Anyways, if we get to know about air hydraulic pump and how it works; a bulk of problems will be solved gradually.

This is not all, the hydraulic pp has more processes and procedures for working. Again, all pumps are not the same, some of them vary in their unique features.

For instance, tap feeding and tank feeding are the most popular types of air hydraulic pumps. To know more about this concept you can’t let go of this article. Let’s have a brief discussion about it

What is an air hydraulic pump?

Before knowing about the air hydraulic pump, we should know about the air hydraulic compressor first. This type of air compressor is usually powered with hydraulic on a machine or vehicle.

Similarly, an air hydraulic pump allows an operator to turn its hydraulic power into airpower. At last, both airpower and Hydraulic power are equipped with vehicles and machines and make them work at their best.

Pneumatic or air hydraulic pumps are the preferred sources to use as compressed air. There are also some popular air hydraulic pumps that provide high pressure in many industrial places.

For instance, the machines and vehicles are the apparent users of these hydraulic pumps. You will get to see the use of this pump in Field service units, and industrial and workshop environments.

How does hydro-pneumatic pump work

Most of us confuse an air hydraulic pump with a hydro-pneumatic pump. Yet the hydro-pneumatic pump is not so similar to the air hydraulic pump.

Hydropneumatic systems usually provide water at a defined pressure but in an automatic way. Also, this system maintains a definite quantity in several locations within a single pumping system.

Again, a hydro-pneumatic pump works in different ways and at different pressures. Before that, it senses the pressure in order to operate automatically. And of course, a preset pressure range remains in this system.

Well, there are various uses of a hydro-pneumatic pump, e.g. quantity of sources and designed pressure. There are two types of hydro-pneumatic pumps that most users like to use. They are tap feeding and tank feeding.

Tap Feeding

In a tap feeding system, you can supply water to the tab directly from the GWT. In this way, it removes all the overhead water tanks. The tap feeding ensures that any pressure can be achieved or designated at each tape you will not get to see in any gravity feeding system.

Tank feeding

In many multi-building complexes, water is usually supplied to each overhead water tank. They use a ring that is connected to the H.P. or UGWT system.

If this tank feeding system is designed properly, it can reduce the cost of maintenance and other problems that usually arise in maintenance.

How to work hydraulic pump

The main task of a hydraulic pump is to convert a prime mover’s mechanical energy. If you see, the Fluid Power of an electric motor creates airflow which determines the velocity that operates in the flow.

Besides, the system creates pressure and finally determines how much work the system can do.

However, measuring the capacity of working in a system gives a glance at its horsepower. Some industrial hydraulic systems use positive displacement pumps with the same output as other revolutions.

Generally, there are three types of displacement pumps used in industrial hydraulic systems. They are- a vane pump, gear pump, and piston pump.

Air hydraulic pump how it works: steps by step guide

Before we go to the steps of using an air hydraulic pump, let us first know what components a hydraulic pump contains. They are:

  • A reservoir- its main task is to hold the hydraulic fluid
  • Electric motor- it helps to power up the hydraulic pump
  • Valves- these control the liquids’ flow and relief all those excessive pressures from the system
  • Hydraulic cylinder- this cylinder generates mechanical energy from a hydraulic energy

So far, we have known what those essential parts are that an air hydraulic pump contains. Now we will be going to know how it works.

Step 1: Creates Fluid Power

First thing first, the hydraulic systems used pumps to create fluid power. After being generated, this fluid power goes through the valves.

Step 2: Converts into mechanical energy

After passing through the valves, the Fluid Power flows through the cylinder and creates mechanical energy from hydraulic energy.

Step 3: Relieves pressure

Last but not least, what a hydraulic pump does is, relieve pressure when needed. Before that, the valves direct the airflow from liquid and then relieve pressure.

Hydraulic pump working principle

The working principle of a hydraulic pump is nowhere different from the working principle of other pumps. On the other hand, the hydraulic pumps generate a partial vacuum in the inlet. As a result, atmospheric pressure is created and forces the fluid to get into the pump’s inlet. Afterward, this hydraulic pump pushes the fluid so that it gets into the hydraulic system.

Describe hydraulic piston pump works

The working process of a hydraulic piston pump is not so complicated. It actually distributes energy and creates pressure which leads to a pressurized fluid cylinder. Often the piston pumps require low pressure and high fluid flow rate which can only be dealt with piston pumps.

Air over hydraulic pump diagram

How does the air over the oil pump work?

Whenever you connect an air-over-oil tank with your valve, it will force all the oil from the tank and take it to the cylinder. Then the pump tops the oil to get into valves and adds control inflow. In this way, the air over the oil pump ensures pump performance and accurate cylinder control. Well, the task of air over the oil pump is not to intensify the oil even if the diameter or lengths of this pump vary.

How does air get into a hydraulic system?

The hydraulic fluids usually contain air bubbles inside them. These bubbles originated from the reservoir. However, the new oil that generates in the reservoir may lead to some turbulent flows. Not only that, you will get to see the stirring of oil that usually introduces the air with the fluid and does cause cavitations. But if you have the correctly designed reservoir in your hydraulic system, such issues won’t arise commonly.

How do you use a prime air hydraulic pump?

Whenever you intend to use a prime air hydraulic pump, be certain that the air comes from the inlet and the piston picks all the fluids which go into the hose. After you get tipped on the opposite side of your pump, the air will start to get in and you are to pick the tube that will lock the entire air.

Nonetheless, you have to use a pedal and hold it in a release position. Then take a screwdriver to activate the button and run the motor precisely. You have to do the step a couple of times and the air will get dumped on the back of the reservoir.


How does the air cylinder pump work?

A cylinder pump usually works and is generally made with three items. They are- piston, inlet, and outlet. The direct flow of air in this cylinder is usually conveyed from the inlet and outlet. On the other hand, the main task of the piston is to generate airflow being pulled up. Afterward, the piston sucks all the air with the help of an inlet. This is how an air cylinder pump works.

Why choose air-driven hydraulic pumps?

The air-driven pumps are a safe option to use in-combustible or hazardous liquids. The reason is, that these pumps are not powered with electricity but by compressed air. Meanwhile, it has been a great reason for the popularity of all hydraulic pumps in many places. Such as research industries, chemical industries, and oil and gas industries.

How can I maintain an air hydraulic pump?

There are some specific steps that help us to maintain our air hydraulic pumps. Such as:

  • Check if the power unit tank’s oil level is okay
  • Check if the temperature of oil changes or not
  • Make sure that there are no leaks
  • Check if there is any oil, dirt, or water in the system
  • Check all the pipe clamps and tighten screws
  • Verify the readings of the pressure gauge
  • Identify the changes in electric motors and running noise of hydraulic pumps


All being well, we have got to know enough about an air hydraulic pump. It leaves no stone unturned to make a machine or vehicle or any significant item work at its best. However, our agenda was to know about the air hydraulic pump and how it works. It has been quite clear that this pump distributes energy and creates pressure that leads to a pressurized fluid cylinder. Alongside, we know that air gets into the hydraulic system and operates it in a specific way.

Summing up, there is no more confusion about an air hydraulic pump. If you are new to the process and procedures of how a hydraulic works, you must not avoid its circumstances as it plays a great role in a lot of fields.

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