Compressor surges happen in turbo charged engines when the accelerator pedal is raised suddenly causing the throttle plate to close. A surge of boost is sent to the engine which can  then only travel into the turbo charger because the throttle plate is closed. The turbo dump valve functions to release pressure to stop compressor surge in a turbo charged engine.

The turbo dump valve is located just after the throttle plate, joined to the intake manifold by a vacuum hose.

The turbo dump valve works by allowing an outlet for the compressed air to escape into the atmosphere or by dispersing the air into the upstream of air in the intake of the compressor inlet when the throttle is raised or closed.

When the throttle is closed, the pressure in the intake manifold plummets below the pressure in the atmosphere and the difference in the pressure between the two actuates the piston in the turbo dump valve. The surplus pressure from the turbo charger is then released into the atmosphere or channelled into the compressor inlet via the upstream of air in the intake. The turbo dump valve protects the turbo charger from damage by preventing compressor surges, providing smooth and reliable engine performance.

If the turbo dump valve gets clogged up with dirt, oil, dust and other particles it can seize up and get stuck open or closed. A faulty turbo dump valve should be replaced as soon as possible. All components that make up the system in a turbo charged engine need to be fully functioning in order for the turbo charger to work. When replacing this part, buying the turbo dump valve will ensure you get a part that's compatible with the make and model of your vehicle.