1. General ZB

1.
General
ZB-302312
2. GENERAL
2.1. Only nitrogen should be used for precharging accumulators (bladder, diaphragm, or piston type).
It is not allowed to use any other gas, not even. compressed air, even if the precharging valve are
relatively low.
2.2. Pressure of the inflating line must never exceed the max. permissible operating
pressure of the accumulator (such value is stamped on the accumulator
body).
2.3. Use the precharging and gauging instrument. PC... for
inflating, gauging or adjusting the precharge of all types of
EPE accumulators (and most of those of competitors).
3.
PRECHARGING AFTER MOUNTING
3.1. Before mounting the precharging instrument on the
accumulator inflating valve (see below), make sure that knob A
is unscrewed, that vent B is closed and that the pressure gauge has
a scale suitable for the precharging level to be reached.
Check valve C should have its cap screwed-in when a precharging
pressure has to be checked or adjusted.
3.2. Screw-in ring nut D on inflating valve 20782 whose thread (5/8" UNF)
corresponds to the thread of the ring nut in practically all models.
For special cases of inflating valves having special connection, adapters are
provided to enable use of the above instrument
3.3. Fully tighten knob A without forcing.
3.4. Using the small diameter hose, connect check valve C to the nitrogen line
located on each assembly stand: yellow for high pressure accumulators;
blue for low pressure accumulators.
3.5. Gradually open the nitrogen line, valve and. keep it open until reaching a.
pressure, slightly higher than the required one. Now close the valve.
3.6. Unscrew knob A. and decompress the instrument by loosening vent B.
3.7. Connect the hose tube to check valve C.
3.8. Close vent B and remove the instrument from the accumulator.
3.9. Using a spray leak detector product or soapy water, check the inflating valve for tight seal. If no leaks
are found, remove the leak detector liquid from the valve using compressed air (If leaks are found, fully
discharge the nitrogen from the accumulator, then proceed to disassemble the inflating valve).
3.10. After inflating, make sure that the nut fastening the gas valve body is fully tightened.
3.11. Complete inflation of all accumulators mounted by repeating the operations described from point 2.2 to
2.10. Then perform the hydraulic test
3.12. Allow the necessary time for the pressure to stabilize before proceeding to the final setting of the
precharge pressure as described in section 3.
(Stable pressure is reached after the heat exchange tending to make the temperature of die nitrogen,
super-heated by compression, equal to the ambient temperature).
4.
GAUGING AND ADJUSTING THE PRECHARGING PRESSURE
4.1. Mount the precharging instrument on the inflating valve with knob A unscrewed, vent B
closed and check valve C with its cap screwed-on.
4.2. Screw-in knob A without forcing, until the pressure is read.
A)
If the precharging pressure is, as it should, be higher than the required value, proceed as follows:
4.3. By means of knob B, gradually discharge the excess nitrogen until reaching the precharging pressure
indicated on the Production Sheet, then close the vent
4.4. Remove the instrument from the accumulator by performing the following steps in the order given:
4.4.1.
Fully unscrew knob A.
4.4.2.
Open vent B.
4.4.3.
Unscrew knurled knob D.
B) If the precharging pressure is equal to the required one, remove the instrument (see points
4.4.1 - 4.4.2 - 4.4.3)
C) If the precharging value is less than the required one, proceed to the inflating as described in
point 3.2 - 3.3 - 3.4 - 3.5 - 3.6 - 3.7. Screw-in the cap on check valve C.
Wait for a few minutes, then repeat the final setting as described in point A.
3.4. After setting, screw-in the seal and protective plugs of the nitrogen valve.
N.B. For ganging and adjusting the precharge pressure, use the special pressure gauges, provided
for each operator, which are submitted to periodic inspection.
5.
DIAPHRAGM ACCUMULATORS WITH CONNECTION M28X1.5
Certain diaphragm accumulator models, instead of having inflating valve 2072, have a hex. socket head cap
screw with seals at the centre of a poppet externally threaded M28X1.5.
For inflating, gauging or adjusting these accumulators, use instrument PCM....
5.1. With the vent closed and the check valve with its cap
screwed-in, fit the instrument of the accumulator through
the knurled ring nut. The pin (10850) is automatically
engaged in the screw head.
5.2. With a 14 mm open ended spanner, loosen the seal screw
by about one turn.
If the accumulator is to be preeharged, follow the
procedure below in the order given:
5.3. Remove the cap and connect to the most suitable nitrogen
line via the small diameter hose.
5.4. Gradually open the nitrogen line valve.
After reaching a pressure slightly above the required
value, close the valve.
5.5. Tighten the seal screw using the 14 mm open ended spanner.
5.6. Depressurize the instrument by loosening the vent.
5.7. Disconnect the hose. Refit the cap on the check valve, then close the vent
The instrument can now be removed by unscrewing the knurled knob or else, after waiting for a few minutes for
the pressure to stabilize, proceed to the final setting of the precharger
5.8. Loosen the seal screw by about one turn.
5.9. Discharge the. excess nitrogen by slightly opening the vent. When the preset pressure is reached, close
the vent
5.10. Tighten the seal screw.
5.11. Open the vent and remove the instrument
5.12. Make sure that there are no leaks.
Pre-loading and checking set
6.1. General
Pre-loading and checking set is used for:
• Control of pre-change value.
• Loading the nitrogen pressure into the accumulator.
• Discharge of exceeding nitrogen pressure.
• Increase nitrogen pressure when the value is not as required.
Use bottles with dry industrial nitrogen and with pressure reducing in order to make the different operations
safely.
6.2 Construction
STANDARD VERSION includes:
• Valve body complete with ring nut connection to accumulator gas valve, pressure gauge, bleed, and non return
snap-in hose connection.
• 3m high charging hose complete with connections.
• One manometer with full scale 250 bar.
• Set of spare gaskets.
• Case.
6.3 ON REQUEST:
• ADAPTERS for Special connections to the gas valve.
• BOTTLE CONNECTIONS for no Italian nitrogen bottles.
• CHARGING HOSE with other length’s.
Max. working pressure: 600 bar
Accumulator
5/8" UNF (Standard)
Connection:
7/8" UNF - Ø 7,7x1/32" (Vg8) - 1/4" - (on request)
Bottle connection: Standard
W21,7x1/14"
external (Italy)
("W24,32x1/14" infernal (D-CH-NL-S-I FL-B-USSR-A-K-PL)
On request
W21,7x1/14"
infernal (F-E)
G5/8-ISO228
external (GB-AA CDN)
Pressure gauge:
- Ø 63 connection 1/4" BSP
Full scale 250 bar (Standard).
Weight:
2 Kg (case included)
6.4 Spare parts
Gasket-set
2160
Non-return
2162
valve
Central pin
2165
Complete bleed
Charging hose
2164
2166
Pressure gauge
2163
6.5 Identification code
The example below shows equipment for filling and checking with pressure gauge of 250 bar, with accumulator
connection 5/8" UNF and Italian Standard bottle connection, complete with 3 m long hose and case.
PC
Type
250
Pressure gauge
full scale
-
-
Connection to nitrogen bottle
(according to Country Standard)
Connection to accumulator
D=
-
PC
(Pre-loading checking)
250 bar
(Standard)
= 5/8" UNF
A = Ø 7,7 x 1/32" (Vg8)
(Adap. 50019)
B = 7/8" UNF
(Adap. 10143)
C = 1/4" ISO 228
(Special ring nut)
-
Germany
Switzerland
Holland
Sweden
Finland
Belgium
Austria
Norway
Korea
BR = Brazil
CHI = China
CHII = China II
F = France
Spain
G = Great Britain
Australia
Denmark
Taiwan
J = Japan
U = U.S.A, Canada
S = South Africa
Hose (Metres)
- = 3 m (Standard)
6 = 6 m (on request)
High pressure range
7.1 Components and spare parts
Table 7.2 gives a list of accumulator components and, for each model, the part
number to be used when ordering spare parts: THIS NUMBER IS VALID FOR
STANDARD VERSIONS ONLY.
For all versions differing from Standard it is necessary to give the manufacture's
serial number and the material.
The bladder must be ordered according to the instructions given the accumulator
identification code or manufacturer’s serial number.
7.2 Spare parts list and part number
1
You use at the moment AS 0,7 !
Models
Item
Description
1 Accumulator shell
2 Bladder
3 Gas valve body
4 Rubber-coated washer
5 Gas valve locknut
6 Protection cap
7 Gas-fill valve
8 Name plate
9 Retaining ring
10 "O" ring
11 Supporting ring
12 Spacer ring
13 Fluid port ring nut
14 Bleed screw
15 Seal ring
16 Fluid port body
17 Popped
18 Spring
19 Brake bushing
20 Self-locking nut
Gas valve assembly
(parts 3-4-5-6-7)
Fluid port assembly
(parts 9 to 20)
Gasket sets
Pcs.
AS 0,2
AS 0,7
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2001
10024
10023
10337
10035
OR4112
10038
10037
10039
10031
10028
10029
10033
1
2002
2021
1
2004
2023
1
Set 2010:
Set 2030:
OR2050
10341
10342
OR4112
10038
AS1 - 1,5
AS 3
AS 5
Not supplied as spare part
See detailed designation
10107
10202
10104
10106
10205
10109
10103
2072
10300-A
10300-B
10300-C
10123
10127
10146
10222
OR4150
OR159
OR6212
10133
10150
10227
10120
10145
10223
10122
10217
10128
10129
10115
10144
10111
10221
10112
10149
10113
10226
10116
10211
OR2050
10341
10342
OR4150
10133
10129 L
OR2093
2022
2024
2025
Set 2031:
OR2050
10341
10342
OR159
10149
10129
OR3150
AS 10-15-2025-35-55
10333
10334
10302
10301
10300-D
10317
OR181
10320
10319
10321
10316-A
10336-A
10311
10310
10322
10314
10315
2042
2062
2044
2064
Set 2050: Set 2080:
OR2050
10341
10342 <
OR6212 1
10227
10129
OR3150
OR2050
10341
10342
OR181
10320
10336
OR3218
Service of AS rang