Specifications
Material of Construction
Body : Carbon Steel-Painted or
Low Temp Carbon Steel or
Stainless Steel.
Diaphragm : Nitrile(NBR) or
Epichlorohydrin(ECO) or
Viton (FKM).
Others on request.
Connections
Gas Side : M28x1,5 (M) or Dia 8 or
5/16” UNEF/Vg8.
Others on request.
Fluid Side : Female Threaded or
Combination Thread (M+F) or
SAE Ports. Others on request.
Technical Data
Design : Welded shell, non-repairable
Max. Pressure (PS) : 40-350 Bar.
Test Pressure (PT) : 1.43 x PS
Temperature range : -20°C to +80°C (Standard)
Allowable pre.ratio (P /P ) : 8:1 (4:1 for AMW-2.8)
2 0
Nominal capacity : 0.075 to 5 Ltrs.
Fluid
Fluid Viscosity range : 10 to 400 cSt
Recommended viscosity : 32 cSt
Fluid contamination degree: Class 21/19/16
according to ISO 4406:1999
or better on request.
Description
A hydro-pneumatic accumulator is a device used
specifically for storage of liquid under pressure. As liquids,
for all practical purposes, are incompressible, this objective
is achieved by utilizing the compressibility of gases.
A flexible rubber separator i.e., diaphragm is fitted into the
accumulator shell.
An inert gas - nitrogen - is filled into the diaphragm through
a pressure valve to a pressure P . The diaphragm expands,
0
filling the entire volume V of the accumulator shell.
0
When the system (circuit) pressure P is higher than the gas
1
precharge pressure P , the liquid enters the shell and the
0
diaphragm is compressed reducing the gas volume to V .
1
Should the liquid pressure rise to P , the volume of gas
2
reduces to V with an attendant rise in pressure, thus
2
balancing the Liquid pressure.
A potential energy is now stored in the accumulator to be
utilised whenever needed.
Construction
The accumulator, designed & manufactured according to
directive 97/23/EC, consists of a pressure vessel on which
the gas connection is located at the top part, while the fluid
connection is in the lower part.
The body contains a flexible rubber diaphragm separating
hydraulic fluid and nitrogen. The diaphragm incorporates a
plug (in polymer, carbon steel or stainless steel), bonded to
the lower part which prevents its extrusion through the
hole of the liquid port.
The top and bottom portions of the Accumulator body are
welded to contain the diaphragm permanently within.
Gas Charging
Pre-loading and Checking Set type-PCM is used with
Version-M Gas Side Connection and type-PC for Version-V.
Accumulators with Version-P are non-rechargeable.
Hydraulic Symbol
1
1
AMW
2
0.75
3
P
4
210
5 6
C
7
C2
9
M PO:10
8
0
:
Diaphragm Accumulator - Welded design
1
Type
= AMW
2
Nominal
Capacity
0.075 Ltrs.
0.16 Ltrs.
0.32 Ltrs.
0.50 Ltrs.
0.75 Ltrs.
1.00 Ltr.
1.40 Ltr.
2.00 Ltr.
2.80 Ltr.
3.50 Ltr.
4.00 Ltr.
5.00 Ltr.
= 0.07
= 0.16
= 0.32
= 0.50
= 0.75
= 1
= 1.4
= 2
= 2.8
= 3.5
= 4
= 5
2
o o
Nitrile (NBR) (-20 C to +80 C)
o o
Epichlorohydrin (ECO) (-30 C to +110 C)
o o
Viton (FKM) (-10 C to +150 C)
Without diaphragm
Diaphragm
Material
3
= P
= Y
= V
= 0
4
Max. Working
Pressure (Bar)
(available sizes)
040 Bar
100 Bar
130 Bar (1.40 | 2.00)
140 Bar (0.75 | 1.00)
160 Bar (0.50 | 1.40)
210 Bar (0.32 | 0.75 | 1.40 | 2.00 | 2.80)
250 Bar (0.07 | 0.16 | 0.75 | 1.00 | 1.40
2.80 | 3.50 | 4.00 | 5.00)
350 Bar
= 40
= 100
= 130
= 140
= 160
= 210
= 250
= 350
5
Body Material
o o
Carbon Steel (-20 C to +80 C) - painted
o o
Low Temp. CS (-40 C to +80 C) - painted
o o
Stainless Steel (-20 C to +80 C) - unpainted
= C
= L
= X
7
Certification
Factory Testing (design as per PED)
CE/PED directive 97/23/EC - marking
= 0
= 8
9
Precharge
Pressure (Bar)
Uncharged condition - Standard
xx Bar
= -
= PO-xx
10
Oil Filling
on Gas Side (ml)
Without any oil fill - Standard
yy ml
= -
= O-yy ml
11
Others
CS Accumulators painted in RAL9005 - std
Other requirements (to specify)
= -
= Z
/ /
10
O:10ml
-
11
To indicate 9/10/11 only if applicable
6
Fluid Side
Connection
Female Thread
Combination Thread (Male + Female)
SAE Connection
Others
With locking nut (external threading only)
= C..
= E..
= S..
= Z
= ...N
Refer
page 3
8
Gas Side
Connection
M28x1.5(M) (Rechargeable type)
ø8 (Non-rechargeable / sealed type)
Plunger design (Rechargeable type)
= M
= P
= V..
Refer
page 3
Fluid side
Connection
6
= C1
= C2
= C3
= C6
= C7
= C8
= E1
= E2
= E3
= E4
= E5
= E6
= E9
= E10
= E11
= E12
= E13
= E14
= E15
= S1-S8
= C4
= C5
= E7
= E8
For upto 250 Bar - Female Thread
G1/2” (F) with ø29
G1/2” (F) with ø34
G3/4” (F)
M18x1.5 (F)
G3/4” (F) without spot face
1/2” NPT(F) with 36 Hex
For upto 250 Bar - Combination Thread
M14x1.5(M) with ø5 hole
G1” (M) x G1/2” (F)
M33x1.5(M) x G1/2” (F)
M42x1.5(M) x G3/4” (F)
M32x1.5(M) x M22x1.5 (F)
M33x1.5(M) x M22x1.5 (F)
M45x1.5(M) x G3/4” (F)
G1” (M) with ø20 hole
G3/4” (M) x M16x1.5 (F)
M18x1.5 (M) with ø8 hole
M18x1.5 (M) with OR
3/4” BSP(M) with ø8 hole
M27x2(M) x M16x1.5 (F)
For upto 250 Bar - SAE Thread
S1 .. S8 (SAE Port Size)
For above 250 Bar - Female Thread
G1/2” (F)
G3/4” (F)
For above 250 Bar - Combination Thread
M33x1.5(M) x G1/2” (F)
M45x1.5(M) x G3/4” (F)
C
S
E
* Before ordering, check for availability
3
1
AMW
2
0.75
3
P
4
210
5 6
C
7
C2
9
M PO:10
8
0
: / /
10
O:10ml
-
11
C
E
To indicate 9/10/11 only if applicable
8
Gas Side
Connection
M28x1.5(M) (Rechargeable type)
ø8 (Non-rechargeable / sealed type)
Plunger design (Rechargeable)
.. 5/8” UNF(M)
.. 5/8” UNF(M) in Stainless Steel
.. 5/16” UNEF(M) / Vg8
.. 5/16” UNEF(M) / Vg8 - Military design
.. 1/4” BSP(M)
.. 7/8” UNF(M)
.. M16 x 2 (M)
.. M16 x 1.5 (M)
.. Without Gas Valve
= M
= P
= VV
= VX
= V1
= VM
= V2
= V4
= V5
= V6
= V0
4
Dimensions
5
Liquid Side Connection Dimensions
6
Mounting Accessories
General
The accumulators should be properly fitted / clamped on the system. Clamping should not cause the shell or the
accumulator connection to be stressed due to over tightening. It is necessary, especially with larger capacities / lengths,
horizontal mounting or with heavy units, to use fasteners (clamps, brackets etc) that support the accumulator and prevent
dangerous vibrations.
To achieve a high degree of efficiency, the accumulator should be fitted as close as possible to the installation it serves. The
space necessary for charging & gauging kit is atleast 150mm above the gas fill valve.
Position
It is suggested that the accumulators are installed vertically with gas side on top. The manufacturers name plate stating
the initial pressure must be visible. Moreover access to the vent screw, if any, must be kept unobstructed.
The mounting must be such that, should a rupture occur on the pipe system at the liquid connection, or should the gas fill
valve break, the accumulator cannot be pulled from its mounting by the forces involved. No welding or other mechanical
process must be carried out on the accumulator shell for the purpose of attaching fasteners.
The choice of the elastomer used for the seals depends on the liquid to be used and on the operating temperatures
(and at times, storage). In the chart below, each polymer has a designated letter to be used in the ordering code.
Code
letter
P
Polymer
ISO
NBR
Temperature
range (°C)
-20 +80to
Some of the liquids compatible with the polymer
Y ECO -30 +110to
V FKM -10 +1 0to 5
Mineral, vegetable, silicon and lubricating oils, industrial water,
glycols, non-flammable liquids (HFA-HFB-HFC), aliphatic
hydrocarbons, butane, diesel oil, kerosene, fuel oils etc.
Mineral oils and greases, aliphatic hydrocarbons (propane,
butane and gasoline), silicone oils and greases, water at room
temperature, resistance to ozone, aging and weathering..
Mineral oils, greases, non-flammable fluids of group, silicone HFD
oils, animal and vegetable oils, aliphatic hydrocarbons (gasoline,
butane, propane, natural gas), aromatics hydrocarbons (benzene,
toluene), chlorinated hydrocarbons (Tetrachloroethylene, carbon
tetrachloride), fuels (regular, super and containing methanol),
excellent resistance to ozone, weathering and ageing.
7
Checking & Charging
For Accumulators with M design Gas Valve use Pre-Loading & Checking Set type-PCM. For Accumulators with V design Gas
Valve PC type with appropriate adaptor is to be used. Accumulators with P design Gas Valve - Non-rechargeable type.
When charging, the nitrogen bottles must be capable of delivering pressure higher than the desired accumulator gas
pressure. Use dry industrial nitrogen. NEVER USE OXYGEN OR AIR.
Proceed as follows:
* Fit the suitable pre-charging equipment to the gas valve;
* Connect it to the nitrogen cylinder with the charging hose;
* Slowly introduce nitrogen into the accumulator until reaching a pressure slightly above the required level;
* Close the valve of nitrogen cylinder and disconnect the charging hose from the equipment;
* Wait for the gas temperature stabilization;
* Set the pressure by venting off the excess of gas.
+5
* Tighten the Charging Valve to 20 Nm using torque wrench.
A PRESSURE REDUCING VALVE MUST BE INSTALLED BETWEEN THE NITROGEN GAS CYLINDER AND
THE ACCUMULATOR WHEN THE GAS CYLINDER PRESSURE IS HIGHER THAN MAX PERMISSIBLE
PRESSURE OF ACCUMULATOR.
Bleed
Non-return valve connection
for charging hose
Ring nut
M28x1.5
OR 16x3
Hexagon 6
SW 14
125
Pre-Loading & Checking Set
Type PCM Type PC
Diaphragm materials | Checking & Charging
EPE Process Filters & Accumulators Pvt. Ltd., Techni Towers, C-54/A, A.P.I.E, Balanagar, Hyderabad - 500 037, Telangana, INDIA
Ph : +91 40 23778803 | Fax : +91 40 23871447 | business@epe-india.com | www.epe-india.com
8
Certification
All hydraulic accumulators are pressure vessels and are
subject to the national regulations and directives, valid at
the place of installation.
Diaphragm accumulator type AMW are designed and
manufactured as per CE/PED in accordance with Directive
97/23/EC.
As per the provisions of Directive 97/23/EC all
accumulators with V ≤ 1 ltr and PS ≤ 1000 bar (PS = max.
working pressure in bar) are not allowed to be CE marked
[Articles 3; 1.1 and 1.4 (3)] .
Accumulators of capacity greater than 1 ltr are available
with CE marking. When specified every shipping batch is
provided with a conformity declaration and use and
maintenance instructions.
Safety
All pressure vessels must be protected by means of a
pressure relief valve in accordance with Directive
97/23/EC. Safety Blocks type-BS are used for this purpose.
The most important elements of the safety-related
equipment are the pressure measuring device (pressure
gauge), device for the preventing excess pressure (safety
valves), non-return valves and shut-off valves and devices
for de-pressurising (bleed valves). These functions can be
performed with individual components or integrated in the
form of a safety block type-BS.
Special Instructions
It is strictly forbidden to:
- weld or solder or carry out any mechanical operations on
the accumulator.
- engrave or permanently stamp the surfaces of the
accumulator shell and / or carry out other operations that
could affect or change the mechanical properties of the
accumulator
- use the accumulator as a structural element: it should not
be subjected to stresses or loads.
- change the data of the nameplate and / or accumulator
without the permission of the manufacturer.
- use a different fluid than those designed for .
Installation
Before installation, you must perform a visual check to
verify that the accumulator has not suffered any damage
during shipping / handling. Verify that the requested type
matches with what stamped on the nameplate.
We recommend using the accumulator with a suitable
safety valve or a security safety block type BS. This
device provides user and equipment protection against
possible damage caused by pressure surges, and also
makes the maintenance of the accumulator easier, so
facilitating the interception and the discharge.
Provide for a clearance of 200 mm above the gas pre-
charge valve to allow access to and control of the pre-
charge equipment.
These accumulators may be installed in any position from
horizontal to vertical (preferably with the pre-charge
valve at the top), and the identification details must be
visible.
Proceed to the assembly so that no abnormal force
affects the pipes connected directly or indirectly to the
accumulator, so we recommend the use of supporting
components and also fastening to avoid the transmission
of vibrations.
Make sure the fluid is compatible with the elastomer of
the diaphragm.
Check that the max. allowed accumulator pressure is
equal to or greater than that of the hydraulic circuit and
that the temperature during operation is maintained
within the range expected.
Make sure the fluid does not contain contaminants
and/or abrasive.
Disposal
Before the accumulator is sent for disposal or recycling, it
should always be discharged completely of the pre-
charge pressure and the gas valve unscrewed. Pre-
loading and checking kits are suited for this task.
For permanently sealed design Accumulators (Version-P)
the diaphragm is preferably damaged on a test rig or the
accumulator is carefully drilled (Ø ≥ 6 mm) on the gas
chamber using a suitable clamp . As the gas flowing out
can draw metal splinters or particles with it, safety
glasses must be worn.
Environmental Protection
Careless disposal of the accumulator and the residual
fluid contained therein can cause environmental
pollution.
Dispose the Accumulator in accordance with provisions
applicable in the country of use.
Fluid residues are to be disposed according to the
respective safety data sheets valid for the specific
hydraulic fluids.
Special Instructions
Disposal Guidelines - Accumulators
Catalogue Ref. : EPE/Disp/15-16/001
1
1
8
Techni Towers
C-54/A, A.P.I.E., Balanagar
Hyderabad -500 037, Telangana, India.
Tel. Nos. : 23778803/23778804/23871445
Fax Nos. : 040-23871447.
Internet : www.epe-india.com
E-mail : business@epe-india.com
U K A S
MA NA GE ME NT
SY STEM S
00 8
ISO 9001:2008
BUREAU VERITAS
Certification
1
8
2
8
U
V
E
A
R
E
I
T
R
A
U
S
B
Disposal
Before the accumulator is sent for disposal or recycling, it
should always be discharged completely of the pre-charge
pressure and the gas valve unscrewed. Pre-loading and
checking kits are suited for this task.
For permanently sealed design Diaphragm Accumulators
(Version-P) the diaphragm is preferably damaged on a test
rig or the accumulator is carefully drilled (Ø ≥ 6 mm) on
the gas chamber using a suitable clamp. As the gas flowing
out can draw metal splinters or particles with it, safety
glasses must be worn.
Fluid residues are to be drained completely before disposal
/ recycle of the accumulator. Decontaminate if needed and
in accordance with local regulations.
Environmental Protection
Careless disposal of the product and/or residual fluid
contained therein can cause environmental pollution.
Dispose the product in accordance with provisions
applicable in the country of use.
Fluid residues are to be disposed according to the
respective safety data sheets (MSDS) valid for the specific
hydraulic fluids.
