How does DV diverter valve works?

A diverter valve, also known as DV valve  or return valve, is a component used in turbocharged and supercharged engines to release excess boost pressure that occurs when the throttle is closed back into the intake before the turbocharger. Its primary purpose is to prevent damage to the turbocharger and improve the response of the engine.
Here's how a diverter valve works in a car:

  Boost Pressure Build-Up

In a turbocharged engine, the turbocharger compresses the intake air and forces it into the engine's cylinders. When the driver releases the throttle (such as during gear changes or deceleration), the throttle plate closes, causing a sudden increase in boost pressure because the compressed air has nowhere to go.

Diverter Valve Operation

The diverter valve is placed between the turbocharger's compressor outlet and the engine's intake manifold. When the throttle is closed, the excess boost pressure is directed to the diverter valve.

Releasing Excess Pressure

The diverter valve opens in response to the sudden increase in pressure. By opening, it releases the compressed air back into the intake before the turbocharger. DV valve works quiet contrary to blow off valves which are loud.

Preventing Turbocharger Damage

If this excess pressure is not released, it can cause problems such as compressor surge. Compressor surge occurs when the compressed air flows back into the turbocharger, slowing down the turbo's spinning wheel. This can lead to premature wear and potential damage to the turbocharger. The diverter valve prevents this by safely venting the excess pressure.

Maintaining Turbocharger Spooling

Additionally, the diverter valve helps to maintain the turbocharger's rotational speed, known as spooling. By releasing excess pressure, the turbocharger can quickly spool back up when the throttle is pressed again, reducing turbo lag and improving throttle response.

Aftermarket Diverter Valves

In performance-oriented and modified cars, aftermarket diverter valves are often used. These valves may be adjustable and allow the driver to control the sound they make or even the amount of pressure that is released.

It's important to note that the use of aftermarket diverter valves does not affect the engine's air-fuel mixture and in most cases do not trigger a check engine light.

Nevertheless, it's advisable to consult with experts or experienced mechanics when modifying any components related to the engine's performance.

You can check our Diverter Vales DV products here.