Hydac FPU-1 Operating Manual
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1. DESCRIPTION
1.1. FUNCTION
The HYDAC charging and testing unit
FPU-1 is used to charge accumulators with
nitrogen or to check or to change the
existing pre-charge pressure in
accumulators.
For this purpose the charging and testing
unit is screwed onto the gas valve of the
hydraulic accumulator and connected via a
hose to a commercial nitrogen bottle.
If the nitrogen pressure is only to be
checked or reduced, the charging hose
does not need to be connected. The unit
has a screw-type tting with a built-in
gauge, check valve and a spindle for
opening the accumulator gas valve to
control the pressure.
HYDAC piston and diaphragm
accumulators can be charged and checked
without the need for adapters. Bladder
accumulators, however, require an A3
adapter.
Please read the Operating Manual!
No. 3.501.CE
Universal Charging
and Testing Unit FPU-1
for Bladder, Piston and Diaphragm
Accumulators
1.3. SPECIAL MODELS1.2. DESIGN
The HYDAC charging and testing unit
for bladder, piston and diaphragm
accumulators consists of:
z Valve body
z Spindle
z Check valve
z Release valve
z Pressure gauge
z Charging hose
z A3 adapter for bladder accumulators
Release valve
Spindle
Check valve
Pressure gauge
For higher pressures, the following special
models are available:
z FPS 600
for bladder accumulators up to 600 bar
max. pre-charge pressure (see technical
information 293715).
z FPK 600
for piston, diaphragm and
SB800-1.5 accumulators up to 600 bar
max. pre-charge pressure (see
technical information 297248).
z FPH 800
for high pressure bladder accumulators
up to 800 bar max. pre-charge pressure
(see technical information 242948).
The photo top left shows a possible order
option, including accessories.
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2. TECHNICAL SPECIFICATIONS
2.1. MODEL CODE
(also order example)
FPU-1 - 250 F 2,5 G2 A1 K
Universal charging
and testing unit
p
max
= 350 bar
Gauge indication range
0 - 10 bar 0 - 145 psi 10
0 - 25 bar 0 - 363 psi 25
0 - 100 bar 0 - 1450 psi 100
0 - 250 bar 0 - 3625 psi 250
0 - 400 bar 0 - 5800 psi 400
Charging hose
F = for 200 bar nitrogen bottle
with connection W24.32x1/14
(DIN 477, Part 1)
FM = for 300 bar nitrogen bottle
with connection M30x1.5
(DIN 477, Part 5 up to April 2002)
FW = for 300 bar nitrogen bottle
with connection W30x2
(DIN 477, Part 5 from April 2002)
Length of charging hose
2.5 = 2.5 m
4.0 = 4 m
Special lengths on request
Adapter G for nitrogen bottles
See table, Point 3.6.
Adapter A
A1 = M16x1.5
A2 = 5/8 - 18 UNF
A3 = 7/8 - 14 UNF
A4 = 7/8 - 14 UNF
A5 = M8x1
A6 = G 3/4 A
A7 = G 1/4
A8 = G 3/4
A9 = Vg 8
A10 = 7/8 - 14 UNF
A11 = M16x2
A12 = M16x2
D4 = 5/8 - 18 UNF
(Part no. 366374)
other adapters on request
Protective case
Accessories - please give full details when ordering
(see Point 4.)
(A3 is supplied as standard)
1.4. TESTING INTERVALS
In general, nitrogen losses on HYDAC hydraulic accumulators are
very low. However, a regular check of the gas lling 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 pressure p
0.
The pre-charge pressure p0 as shown on the label or the
accumulator body, must be re-set after every new installation or
repair and then checked at least once during the following week. If
no nitrogen loss is detected, a further check should be made after
approx. 4 months. If after this period no change in the pressure is
found, a yearly check should be sufcient.
1.5. SCHEMATIC DRAWING
Fluid connection
Nitrogen bottle
Hydraulic
accumulator
Adapter A
MG1
Charging
hose
Adaptor G Pressure reducer Charging and testing unit FPU-1
N
2
N
2
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3. DIMENSIONS
3.1. CHARGING AND TESTING UNIT FPU-1 WITH ADAPTER FOR HYDAC ACCUMULATORS
Bladder accumulators
330-0.5 / 400-0.5
Bladder accumulators
≥ 1l
Gas valve
to ISO 10945
Piston and diaphragm
accumulators
D4 Adapter
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