Dump Valves

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Why use a dump valve (or blow-off valve)?

Used on turbocharged gasoline engines, the dump valve is a mechanical part installed on the intake pipe which reduces lag when you open the throttle again and improves the reliability of the turbo.

When we step on the gaz pedal, the turbo compresses the air and discharges it through the intake to supply the cylinders. When we release the pedal, the throttle plate closes but the turbo continues to spin due to its inertia and generates excess pressure. This can cause harmful back pressure which can reverse the rotation of the compressor and turbine.

The main purpose of the dump valve is therefore to release this excess pressure to protect the turbo and improve its response. There are bypass valves (closed loop operation) which discreetly vent air back to the intake manifold, and vent-to-atmosphere blow-off valves (open loop) which discharge it directly into the engine compartment by making the famous "whoosh" noise.

Depending on the products, we can find membrane dump valves suitable for stock pressures and single piston or double piston models designed for larger boost setups.

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Top Seller HKS Super SQV IV Blow Off Valve - Universal

HKS Super SQV IV Blow Off Valve - Universal

$278.39
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(44 reviews)
Top Seller GReddy FV Dump Valve - Universal

GReddy FV Dump Valve - Universal

$231.99
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(5 reviews)
HKS Super SQV IV Blow Off Valve for BMW 135i & 335i

HKS Super SQV IV Blow Off Valve for BMW 135i & 335i

$405.99
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(5 reviews)
Aluminium Connection Pipe for GReddy Dump Valve (Flange)

Aluminium Connection Pipe for GReddy Dump Valve (Flange)

$23.19
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(2 reviews)
Aluminium Connection Pipe for HKS Dump Valve (Flange)

Aluminium Connection Pipe for HKS Dump Valve (Flange)

$28.99
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(1 review)
GReddy Universal 42 mm Dump Valve Flange

GReddy Universal 42 mm Dump Valve Flange

$46.39
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(1 review)
HKS SSQV "High Frequency" Fin - Gold

HKS SSQV "High Frequency" Fin - Gold

$28.99
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(1 review)
HKS Purple Super SQV Special Fin
 "Low Frequency" - Purple

HKS Purple Super SQV Special Fin "Low Frequency" - Purple

$28.99
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(3 reviews)
Top Seller Universal HKS SSQV Flange 25 mm

Universal HKS SSQV Flange 25 mm

$17.39
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(5 reviews)
HKS Super SSQV Universal Flange - Steel 65 mm

HKS Super SSQV Universal Flange - Steel 65 mm

$34.79
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(1 review)
Top Seller HKS SSQV Replacement O-Ring & C-Ring Set

HKS SSQV Replacement O-Ring & C-Ring Set

$25.51
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(3 reviews)
Universal HKS SSQV Flange 34 mm

Universal HKS SSQV Flange 34 mm

$17.39
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(10 reviews)
HKS Super SSQV Universal Flange - Aluminium 60 mm

HKS Super SSQV Universal Flange - Aluminium 60 mm

$34.79
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(7 reviews)
HKS SSQV Recirculation Adapter

HKS SSQV Recirculation Adapter

$34.79
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(2 reviews)
HKS Super SQV IV Blow Off Valve for Renault Megane 2 RS

HKS Super SQV IV Blow Off Valve for Renault Megane 2 RS

$452.39
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(1 review)
Top Seller HKS Super SQV IV Blow Off Valve for Renault Megane 3 RS

HKS Super SQV IV Blow Off Valve for Renault Megane 3 RS

$429.19
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(9 reviews)
HKS Super SQV IV Blow Off Valve for Suzuki Swift Sport ZC33S

HKS Super SQV IV Blow Off Valve for Suzuki Swift Sport ZC33S

$422.23
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(2 reviews)
HKS Super SQV IV Blow Off Valve for Honda Civic Type R FK8

HKS Super SQV IV Blow Off Valve for Honda Civic Type R FK8

$574.19
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(1 review)
HKS Super SQV IV Blow Off Valve for Subaru Impreza GD (00-07)

HKS Super SQV IV Blow Off Valve for Subaru Impreza GD (00-07)

$366.55
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(3 reviews)

Universal or specific dump valve, we have the one you need!

DriftShop markets a wide range of HKS, GReddy and Turbosmart dump valves, universal type or specifically designed for a vehicle, from light tune to the most extreme mod.

As a supercharging specialist, HKS has conquered the planet with its legendary SSQV, available in a version suitable for all turbo engines or specially produced for a particular model. Another Japanese manufacturer, GReddy is not left out with its very high quality, extremely quick and reliable FV. The Australians of Turbosmart, for their part, developed recirculating and atmospheric models or a mix of the two types for powers up to 2500 hp!

You will also find on this page accessories and spare parts to enhance your setup, such as flanges, connection pipes, fins, gaskets or even adapters.