HKS original 3-chamber structure ensures the stable operation of blow-off valve regardless of the amount of pressure. Large 51mm valve performs great with high power and large displacement engines. Adjustable pre-load allows a wide range of application.


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 relieved under high boost, and the desired boost setting may not be reached. If the spring load setting is too strong, the valve may not open at low boost. 
HKS RACING SQV utilizes a reliefless type; therefore, it delivers stable operation at all boost levels.
Durability tests of over 1 million operations minimizes the chances of valve stick and achieves high durability.

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.

  • Accelerater ON
    Valves Closed

    As pressure rises in chamber C, pressure is applied to a single valve. The higher the boost pressure, the more pressure is applied to the valve, preventing leaks.

  • Accelerater OFF
    Valve Opens

    Throttle lift creates a pressure dierence between chambers A&B, opening the single valve. This creates the large air volume discharge.

  • Accelerater OFF
    Valve Closes Plocess

    The differential pressure in chamber A & B is eliminated as time elapses, and a spring reaction force closes the valve.

Product Model Engine Year Code RRP (exc VAT) Notes
Racing SQV - - - 71008-AK004 call Vehicle Info

All prices are RRP and exclude VAT.