BPV valve – what is it and what is its function?

In the construction of motor vehicles, engine charging systems have become an integral part of most vehicles. One of the key components of these systems is the BPV valve, which plays an important role in maintaining optimal air pressure in the system. In this article, we will learn what exactly the BPV valve is, how it works and what functions it performs in the charging system. We will also see why the regeneration of BPV valves is a beneficial solution in the event of failure of these elements.


What is a BPV valve?

The BPV valve, or By-Pass Valve, is a mechanical element used in the charging systems of combustion engines. Its main task is to remove excess air pressure from the system, thus protecting the engine against damage. This is especially important in the case of a turbocharger, where excess pressure can cause various problems.


Principle of operation of the BPV valve

The basic operating principle of the BPV valve is to open and release excess air pressure when the system pressure exceeds a certain predetermined level. When the driver releases the throttle, the BPV valve opens, allowing excess air to escape. This prevents overload that could lead to damage to the turbocharger or other system components.



Functions of the BPV valve in the charging system


The role of the BPV valve in the charging system is crucial for the proper operation of the engine. Its main functions are:

– Turbocharger protection – the task of the BPV valve is to protect the turbocharger against excessive pressure. Through the controlled release of excess air, it effectively eliminates the risk of damage to the rotor, which affects the durability of this key element of the system.

– Maintaining smooth operation – the BPV valve actively supports the smooth operation of the charging system. By quickly releasing excess air when changing gears or releasing the gas pedal, it eliminates delays in engine response, known as “turbo-lag”.

– Overload prevention – this element effectively protects the charging system against overloads by controlling the air pressure. This minimizes the risk of damage to other components, such as the intercooler or connecting pipes.

– Efficiency optimization – a key aspect of the BPV valve operation is the impact on engine efficiency. The reduction of excess pressure not only translates into fuel savings, but also into increased power, which is an important criterion for users seeking an economical and efficient solution.

Advantages of using BPV valves in the charging system

The use of a BPV valve brings a number of benefits. Firstly, it improves the durability of the turbocharger, which results in a longer life of the entire supercharging system. Additionally, reducing excess pressure improves engine efficiency, which translates into fuel savings and increased power.


The most common BPV valve faults – causes

The most common causes of BPV valves are:

– Seal wear – one of the main reasons for failure is the wear of the seals inside the BPV valve. Over time, they may wear out, which leads to, among other things, for oil leaks.

– Contamination – the accumulation of contaminants, such as dust, oil or fuel residues, may make it difficult to open and close the valve freely. This phenomenon affects its effectiveness and may lead to loss of function.

– Mechanical damage – strong shocks, impacts or mechanical damage may lead to physical damage to the BPV valve. This may include cracks, deformations or loss of structural integrity.

– Improper calibration – The BPV valve requires precise calibration to function as intended. Incorrect calibration, often resulting from unprofessional adjustment or use of inappropriate components, can lead to problems.

How to recognize a BPV valve failure?

Recognizing a BPV valve failure can be crucial to maintaining the efficiency of the supercharging system. Typical symptoms include hissing sounds or whistles when changing gears, loss of engine power and unstable operation of the turbocharger. Regularly checking the condition of the valve can help you quickly detect any problems.

Regenerated BPV valves – a beneficial way to restore the efficiency of the charging system

In the event of BPV valve failures, a beneficial option may be to regenerate these elements or replace the damaged valves with regenerated ones. At Arcoore, we offer regenerated BPV valves for vehicles of various brands, both younger and older models. Regenerated valves are characterized by full technical and operational properties, thanks to which they restore the efficiency of the charging system. At the same time, they are a much more economical option than purchasing brand new elements.


The BPV valve is a key element of the charging system, which is responsible for maintaining optimal air pressure. Its proper functioning affects not only the durability of the turbocharger, but also the engine efficiency. Regular inspection and possible valve regeneration are key activities that help keep the charging system in full working order. In case of faults, it is worth considering choosing BPV valves.

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