General Information - HYDAC International FPU Notice D'utilisation

1. General information

In general, nitrogen losses on HYDAC
hydropneumatic hydraulic accumulators are
very low. However, a regular check of the
pre-charge pressure is recommended to
prevent the piston from hitting the end cap, or
the bladder or diaphragm from becoming too
deformed, if there is a drop in the pre-charge
pressure p .
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The charging and testing units, also referred to
as FPU, must only be used as intended.
Max. operating pressure of FPU-1: 350 bar
Max. operating pressure of FPU-2: 800 bar
1.1. Description
The HYDAC FPU is designed to charge
hydraulic accumulators and to check the
nitrogen pre-charge pressure.
For this purpose, the FPU is screwed onto the
gas valve of the hydraulic accumulator and
connected via a flexible charging hose to the
nitrogen supply.
The FPU-1 must be used with a commercial
nitrogen bottle (200/300 bar) and the FPU-2
must be used with an intensifier.
If the pre-charge pressure is only to be
checked and then reduced, the charging hose
does not need to be connected.
GB
Only use nitrogen to charge
hydraulic accumulators.
Never use oxygen or compressed
air! RISK OF EXPLOSION!
NOTICE
If translated, the only valid text is that of the
original German instruction manual
(www.hydac.com).
42
NOTICE
Key to fold-out pages:
2 I = Table "Adjustment of the nitrogen
pre-charge pressure p
of the operating temperature"
3 I = FPU-1 (with sectional view)
3 II = Adapter A3 for bladder accumulators
3 III = Gas charging connection for bladder
accumulators
3 IV = Gas charging connection for piston
and diaphragm accumulators
4 I = FPU-2 (with sectional view)
4 II = Adapter A3H for bladder accumulators
4 III = Gas charging connection for bladder
accumulators
4 IV = Gas charging connection for piston
and diaphragm accumulators
5 I = G adapters (part number)
FPU-1 for nitrogen bottles up to
200 bar
5 II = Charging hoses F, FM, FW for FPU-1
5 III = Charging hose FH for FPU-2
2. Construction
The HYDAC FPU is a screw-on unit for bladder,
piston and diaphragm accumulators. The
following parts are built on as standard:
– Valve body
– Spindle
– Check valve (FPU-1 only)
– Release valve
– Pressure gauge
– Charging hose
– Adapter A3 (FPU-1) / Adapter A3H (FPU-2)
only for bladder accumulators
as a function
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