Skip to content
Lion Yard Trading
Mercedes-Benz · Engine

Diverter and blow-off valve

The valve that releases boost pressure when the throttle closes, so it does not back up against the turbo.

Also called dump valve, recirculation valve, diverter valve.

How you know it is this

  • A loss of boost with a hiss on lifting off
  • Hesitation between gearchanges
  • A torn diaphragm visible when the valve is removed

Worth knowing before you buy

  • The diaphragm splits. It is a cheap part and a common boost-leak cause.
  • On most modern engines it is a recirculating valve, not an atmospheric dump valve — fitting an atmospheric one upsets the fuelling.
  • Some are built into the turbo and cannot be bought separately.

What we need to quote it. The engine code. The chassis number settles the generation, the body and usually the engine in seventeen characters — it is on your mulkiya. A photograph of the old part helps where there is more than one version.

TurbochargerActuator and wastegateOil feed and returnCharge pipesIntercoolerBoost pressure sensor
Turbo and charge air — schematic, to show where the part sits. Arrangement is right; it is a diagram and not a fitment reference.

Rest of the forced induction

All engine parts
Get in touch

Diverter and blow-off valve for your Mercedes-Benz?

Send the chassis number and a photograph of the old part. We come back with genuine, OEM and aftermarket options priced side by side, with lead times.

Mon–Sat, 8:00 AM – 6:00 PM · +971 54 303 3119 (Operations Director) · +971 54 241 0599 (Managing Director)