Preparation - HYDAC International FPU-1 Notice D'utilisation

6.1 Preparation

NOTICE
Adapter A3 must only be used with the FPU‑1.
– On bladder accumulators, unscrew valve
protective cap (S) and seal cap (H) and
remove O‑ring (O). Slightly unscrew the
adjusting screw of adapter A3 and screw
adapter A3 on to the accumulator gas valve.
– For piston, diaphragm and metal bellow
accumulators, loosen the allen screw (P)
with an allen key AF width 6 (WZ2),
DIN ISO 2936 by approx. 1/2 a turn.
– Manually screw FPU‑1 cap nut (D) on to
adapter A3 on the bladder accumulator or on
to the accumulator gas valve of the piston,
diaphragm or metal bellows accumulator.
– Rotate charging device so that the pressure
gauge is in a good position for taking
readings.
6.2 Testing
– Firmly close the unloading valve (B) on
EN
FPU‑1.
– On bladder accumulators, open the gas
valve insert (E) in the hydraulic accumulator
by rotating the spindle (A) clockwise until
the indicator on the pressure gauge moves.
– On piston, diaphragm or metal bellows
accumulators, open the allen screw (P) in the
accumulator by rotating the spindle (A) anti-
clockwise until the indicator of the pressure
gauge moves.
– The pressure gauge now displays the
pre‑charge pressure (p
accumulator.
The unloading valve (C) prevents nitrogen
from escaping.
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6.3 Pressure increase
(charging/recharging)
NOTICE
To recharge a hydro accumulator, always
follow the work steps in section 6.2.
An accumulator is also recharged in steps.
For bladder, piston and diaphragm
accumulators:
Step 1 1 ‑ 2 bar
Step 2 2 ‑ 3 bar
Step 3 desired pre‑charge pressure (p
For metal bellows accumulators:
0.2 bar per second until desired pre‑charge
pressure (p ) is reached. This must not be
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exceeded at any point during the charging
process.
– Connect the pressure reducing valve to the
nitrogen bottle.
For nitrogen bottles from other countries, use
a G adapter (see fold‑out page, Drawing 5 I).
– Connect the charging hose to the pressure
reducing valve with the cap nut G1 (GM1,
GW1) on the charging hose.
– Connect the cap nut (M) of the charging
hose to the unloading valve (C) of the
FPU‑1.
– Close the pressure reducing valve.
– Open the shut‑off valve on the nitrogen
bottle. The pressure gauge at the pressure
reducing valve shows the starting pressure
(starting pressure = nitrogen bottle pressure).
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