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Adjustments and servicing procedures
Single pressure system (XRVS)
The working pressure is determined by the tension of
the spring in the regulating valve (RV). This tension
can be increased to raise the pressure and decreased
by turning the adjusting wheel clockwise and anti-
clockwise respectively.
To adjust the normal working pressure, proceed as
follows:
1. Loosen the lock nut of the regulating valve.
2. Release Regulating Valve (turn out).
3. With the outlet valves (AOV) closed, adjust the
regulating valve (RV), until a pressure is reached
of nominal pressure + 2 bar (+ 29 psi).
4. Lock the regulating valve (RV) by fixing the lock
nut.
Dual pressure system (option for XRXS)
The dual pressure system has two regulating valves
marked with RVlp and RVhp and a switch at the rear
for selecting the lower (RVlp) or higher (RVhp)
working pressure.
Set the regulating valve marked with RVlp at a
working pressure lower than the regulating valve
marked with RVhp. This means the handle of RVlp
should be scewed in less than the handle of RVhp.
This pressure setting is very important. When done
otherwise the system will not work correctly.
When RVlp is set at a working pressure of maximum
25 bar (363 psi), the rpm will increase to 1900 rpm
(instead of 1800 rpm) to deliver more FAD at this
“lower” pressure. RVlp can be set at a pressure higher
than 25 bar (363 psi), but then there will be no speed
increase.
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