Exhaust Brakes: Mechanics
With over 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.
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.
There is less
than a 10% change in backpressure over the entire RPM range on the