Exhaust Brakes: Mechanics
a quarter of a million exhaust brakes manufactured and sold,
Pacbrake has mastered quality product development. Being home
to the only exhaust brake on the market with a true variable
orifice, remarkable constant backpressure and strongest braking
horsepower, Pacbrake has revolutionized modern day exhaust
braking with its patented design of the PRXB.
SO SPECIAL ABOUT THE PRXB?
order to have consistent and effective braking over the entire
RPM range, it is important (and necessary) to maintain constant
backpressure. To achieve this, Pacbrake's patented design
has incorporated an additional waste gate on the butterfly
valve to regulate the amount of exhaust flow that is being
passed through. The flow is controlled by a spring-loaded
arm, whose pressure rating and location are key factors in
the functionality of the PRXB. Located outside of the housing
and away from the heat, the spring is able to maintain its
strength and durability for years of proper and precise braking
IT ALL TOGETHER
& MAINTAINING BACKPRESSURE
is created by exhaust flow entering the housing, hitting the
closed butterfly valve and being forced back out in the direction
it came. It is maintained by the pressure-controlled spring
that is located on the outside of the exhaust brake housing.
the engine's RPM increase, the spring compresses and the arm
moves away from the butterfly valve, therefore releasing more
exhaust flow through the orifice. As the RPMs decrease, the
spring releases and the arm applies pressure back onto the
plate, covering the hole, and ultimately releasing a smaller
amount of exhaust flow.
is less than a 10% change in backpressure over the entire
RPM range on the PRXB