The HKS Super Sequential Blow-Off
Valve (SSQV) is a dual stage pull-type relief valve. Unlike typical
push type blow-off valves, the SSQV will not leak under any level of
boost because the boost pressure in chamber "C" keeps the valve closed
against its seat (Diagram 1). The SSQV releases excess boost
when there is a pressure alteration in chambers "A & B", not by the
rate of boost pressure or vacuum in the line. This ensures a quick
valve response and complete closure during idle. Many competitors use a
push-type blow-off valve design with a large valve to accommodate high
boost / high horsepower applications. These large valves react slowly
and require high pressure to open, and are not able to activate and
prevent compressor surge at light-load conditions. On the other hand,
smaller, fast reacting push-type valves do not discharge the airflow
capacity required for high horsepower applications and tend to slowly
open and leak as boost pressure overpowers the spring. For maximum
performance, the HKS SSQV incorporates both a small primary valve for
ultra quick activation, and a larger secondary valve for additional
discharge capacity. The SSQV is engineered to initially open the small
primary valve at light throttle and load conditions (Diagram 2), then sequentially opens the secondary valve for additional relief capacity under high boost and load conditions (Diagram 3).
The SSQV is constructed of polished billet aluminum, which ensures
long-term durability and a high luster look. The mounting base utilizes
a circular mounting flange that combines with a C-clip snap ring and
O-ring gasket to insure an excellent seal. The triple-fin discharge
port design produces a powerful, unique and aggressive blow-off sound.
The HKS SSQV is available in vehicle specific kits
or as a universal unit for custom applications. Vehicle specific HKS
SSQV kits come complete with all mounting flanges, brackets, and
miscellaneous hardware for an easy installation. For Universal SSQV
applications, weld-on flanges are available in steel or aluminum for
custom installation.
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