5 Reasons Why Your Air Compressor is Slow to Build Pressure

Intro

Sometimes air compressors are slow to build Pressure. It keeps running but does not get up the Pressure that you want. That is very annoying. Compressors can not build up Pressure for so many reasons.

If your compressor slows to build Pressure, you must find out quickly. Otherwise, your compressor will be damaged and also hamper your work. We will discuss five reasons your air compressor is slow to build Pressure. 

The most common issues are the motor becoming overheated, faulty switch, faulty intake valve, and so on. Below, we will explain the reasons and how to fix them. If you face the problem, read the article. We will find the solution. 

5 Reasons Why Your Compressor is Slow to Build Pressure 

We are addressing five reasons why your compressor is slow to build Pressure. They are- 

  • Failing Tank Check Valve
  • Damage Piston Seal
  • Faulty Intake Valve
  • Pressure Valve Failing
  • Failed Compressor Gasket 

Now we will discuss the issues and also give the solutions. Continue the reading. 

Failing Tank Check Valve

Tank Check Valve is a simple compressor component located between the line and the tank. It prevents the backflow of air from the tank to the bar.

The work process of a compressor is like that- the air goes through the pump head and the line and into the tank. At this time, a flap stays open in the check valve. The flap will close to prevent air from flowing out when the compressor shuts off. 

So the tank check valve plays an essential role in the entire process. So if the check valve breaks, the whole process will be interrupted. The failing tank check valve prevents the airflow in the tank or the compressed air from becoming trapped in the tank when the compressor turns off.

How to fix the failing tank check valve 

You have to replace the failing tank check valve. It is a pretty straightforward process. You can do it quickly. If you need to learn the process, you can contact an expert.  

Damaged Piston Seal

A damaged piston seal is one of the reasons for the slow-to-build Pressure of your compressor. But this problem is only for some compressors. The compressors with oil-lubricated have a pistol seal. If your compressor is oil-lubricated, you can face this problem.  

The air compressor operates with a pump that has piston seals. The pumps pull compressed air, and the seal work as a seal. They prevent too much oil from getting into the cylinders.  

A compressor made with an oil sump that has an oil fill portal. The portal is a tube with a cup. The air is out from the compressor tube vent cap for faulty pistons. 

The main reason for the damaged pistons is wear and tear. 

How to fix the damaged piston seal 

Rebuild, or replacement is the best option for fixing the damaged piston seal. Another option is to take apart the pump and replaces the rings. 

Faulty Intake Valve

 A faulty intake valve is another reason for the slow build pressure of your compressor. A faulty intake valve is similar to a failing pump or fapper pressure valve.    

The compressor can not compress air with a faulty intake valve. The air enters the intake valve without a compressed process. Some air enters the tank when they go through the intake valve. So the compressor builds Pressure slowly and stops it at a particular. 

If addressing the compressor build pressure slow for the intake valve, you must check the air intake port. But it is a complex process. So you have to ensure about the problem and be careful. 

To check the intake port, you have to remove the air filter. Then place your hand near the intake. At this time, the compressor is running. Now you have to feel the air. If you think the information is sucking air in, there is no problem. If you feel the air coming out of the port, the pressure valve has some problem. 

Remember, you have to do this process in the shut-on compressor. So be careful when you do it. If you can’t, you can contact an expert.  

How to fix the faulty intake valve 

To fix the problem, you can replace the intake valve. But some compressors allow replacing the intake valve. Some are not. It depends on your compressor. Also, according to your compressor model, a new intake valve is complex.

Although you can search in the market or online shop, you must check the intake valve plate so that it will adjust with your compressor.    

Pressure Valve Failing

Pressure valves are also called flappers. It is an integral part of an air compressor. Your compressor can not build Pressure if the pressure valve fails even though the motor runs continuously.  

There has another reason for a compressor cannot build Pressure. If the tanks build a certain amount of Pressure, the motor cannot build Pressure. So the compressor becomes slow to build Pressure.  

After running the compressor, the air will pull on the compression movement. The failing pressure valve can not prevent the air. So extra air goes into the compressor. That’s why the Pressure can not build up. 

To find the issue, you have to check the pressure valve. So turn off the compressor and drain the tank. Then pull the line out of the piston head. Now start the compressor and check the airflow. If you can block the airflow with your hand, the pressure valve is the problem. 

How to fix the failing pressure valve 

Fixing the problem generally requires replacing the pressure valve. But it is a cost-effective process. You can do it on your own if you are an expert. Otherwise, you can contact an expert. 

Failed Compressor Gasket 

An air compressor has a valve plate with the intake and the pressure valves. The gasket separates these valves. If the gasket fails, it may not affect the pump and motor. But it affects the entire compressor. The compressor cannot build up Pressure.

A failed compressor gasket is one of the reasons for the slow-to-build Pressure of your compressor. But it’s hard to figure out that this is happening for gaskets. Because it occurs when the pressure reaches a certain point. A leak is created when the Pressure comes to a high point for a faulty gasket.

The air is sucked in when the piston rotates, and the air enters the tank when the piston is compressed. It is the usual process to build up Pressure in the compressor. But the faulty gasket creates problems in this process. 

A failed compressor gasket will create airflow in the pump, moving in and out of the intake. It reduces the air flowing through the line into the compressor cylinder.

How to fix the failed gasket 

As we mention, it is difficult to find out the faulty gasket. So you have to ensure the problem is the gasket before fixing it. Replacing the gasket is one of the solutions. But replacing the gasket is expensive. 

FAQ

Why does my air compressor take so long to fill up?

There have so many reasons the air compressor takes so long to fill up. The reasons are
Pressure valve failing
Gasket failure
Seal problem
Intake valve problem
If you face this problem, check your compressor and find the reason.

How long does it take for an air compressor to build Pressure?

Usually, an air compressor takes 2.5 minutes to build Pressure. 

What to do if your air compressor won’t build Pressure?

Follow the steps if your air compressor won’t build Pressure.
Keep filters clean
Examine the air/oil separator
Evaluate belt condition
Conduct a pump-up test
Check all of your compressed air system valves
Assess air demand and screen for leaks
Assess motor capacitors
Inspect pump rings

What causes a compressor not to build up Pressure?

The causes a compressor not to build up Pressure are-
Failing Tank Check Valve
Damage Piston Seal
Faulty Intake Valve
Pressure Valve Failing
Failed Compressor Gasket 

Final Thought

Air compressors are valuable equipment for the garage and homework. We can do any hard work quickly with a compressor. It makes our life easy. But if your compressor fails to run during operation, that isn’t very pleasant. 

Sometimes air compressors are slow to build Pressure. It keeps running but does not get up the Pressure that you want. It is a common issue for a compressor if some part of your compressor becomes damaged when you face this problem.

We were addressing five reasons why your compressor is slow to build Pressure. Also, we discussed them and gave the solutions. If you read the article correctly, you already give your answer. Now you know why your air compressor is slow to build Pressure. 

Meta

If your compressor slows to build Pressure, you must find out quickly. Otherwise, your compressor will be damaged and also hamper your work. We will discuss five reasons your air compressor is slow to build Pressure.