Greenline Motorsports - HKS Racing SQV Blow Off Valve Information

HKS Racing SQV Blow Off Valve Information

Main Features

3 Chamber System

Typical blow off valves require spring load settings for each vehicle specification.
If the spring load setting is too low, the boost pressure may be released under high boost, and the desired boost level may not be reached.
If the spring load setting is too high, the valve may not open at low boost.

HKS RACING SQV is a reliefless type valve, delivering stable operation at all boost levels.
Durability testing with over 1 million operations has proven that the valve is highly durable and chances of the valve "sticking" are extremely low.

HKS "RACING SQV" Structure, HKS Original 3-chamber System

HKS' original 3-chamber structure ensures the stable operation regardless of the amount of boost pressure.


As pressure rises in chamber C, pressure is applied to the single 51mm valve. The higher the boost pressure, the more pressure is applied to the valve, preventing pressure leaks.	Throttle lift creates a pressure difference between chambers A and B, opening the single valve. This creates a large air volume discharge.	The differential pressure in chamber A and B is eliminated as time elapses. A spring reaction force closes the valve.

Source: HKS Japan/USA

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