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SSQV blowoff valve kit for WRX
The HKS Super Sequential Blowoff Valve (SSQV) is a dual stage pull type
relief valve. Unlike other blow off valves that are push type, the SSQV
will not leak under high boost conditions nor under vacuum at idle. Being
of a pull type valve structure, the SSQV can not physically leak under
any level of boost because boost pressure also keeps the valve closed
against its seat. The SSQV is actuated by pressure alterations only, not
by the rate of pressure or vacuum in the line, which ensures a quick valve
response and complete closure during idle. On typical blow-off valve designs,
a large valve is utilized in order to accommodate high boost / high horsepower
applications. However, these large valves tend to react slowly and require
high activation pressure to open, therefore are not able to activate and
prevent compressor surge at light-load conditions. On the other hand,
smaller, fast reacting valves do not discharge the airflow capacity required
for high horsepower applications and tend to creep open and leak as the
boost pressure overpowers the spring on these push type valves. For maximum
performance, the HKS SSQV incorporates both a small primary valve for
ultra quick activation, along with 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, then sequentially
opens the secondary valve for additional relief capacity under high boost
and load conditions. The SSQV is constructed of polished billet aluminum,
which ensures long-term durability and visual appeal.
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