Diaphragm Accumulators. DESCRIPTION.. FNCTION Fluids are practically incompressible and cannot therefore store pressure energy. The compressibility of a gas is utilised in HYDAC diaphragm accumulators are based on this principle, using nitrogen as the compressible medium. Diaphragm accumulators consist of a diaphragm acting as a gas-tight separation element. hydraulic circuit so that the diaphragm pressure increases and the gas is compressed. When the pressure drops, the compressed gas expands and forces Set into the base of the diaphragm is a valve poppet. This shuts off the hydraulic empty and thus prevents damage to the diaphragm. Note: European Pressure Equipment Directive (PED) and the German Industrial Safety Regulations (Betr.Sich.V.). See catalogue section: Safety and Shut-off Block SAF/DSV No. 3.55.2. DESIGN.2. Weld type rechargeable pressure vessel diaphragm valve plate valve body sealed gas connection This consists of: Welded pressure vessel, rechargeable on the gas side or, alternatively, completely sealed. Fluid connection available in various types. Valve poppet set into the base of the diaphragm..2.2 Screw type pressure vessel diaphragm valve plate valve body.2.3 Diaphragm material The diaphragm material must be selected see section.5. If discharge conditions are unfavourable (high p 2 /p 0 pressure ratio, rapid discharge permitted temperature. This can cause cold cracking. The gas temperature can be calculated using the HYDAC Accumulator Simulation Program ASP. This consists of: connection. connection. Vulcanized valve poppet set into the base of the diaphragm. sections of the accumulator together..2.4 Corrosion protection corrosion protection, such as plastic coating or a galvanic or chemical surface all types can be supplied in stainless steel..3. INSTALLATION POSITION contamination collecting, a vertical position bottom). 63
.4. TYPE OF INSTALLATION directly inline. Where strong vibrations are expected, the accumulator must be secured to prevent it a suitable support console can be ordered. For additional male thread on the hydraulic holes, see table 3.. See catalogue section: Supports for Hydraulic Accumulators No. 3.502.5. GENERAL.5. Permitted operating pressure see tables 3.. and 3.2. The permitted operating pressure can differ from the nominal pressure for foreign.5.2 Nominal volume see tables 3.. and 3.2..5.3 Effective gas volume corresponds to the nominal volume of the diaphragm accumulator..5.4 the operating pressures p 2 and p..5.5 Gas charging protective pre-charge. Higher gas pre-charge pressures are or sealed gas connection). Hydraulic accumulators must only be Never use other gases. Risk of explosion! In principle, the accumulator may only be <3 μm. If other gases are to be used, please contact HYDAC for advice..5.6 Limits for gas pre-charge pressure p 0 p 0tmax 200 bar for further information, see catalogue section: HYDAC Accumulator Technology No. 3.000.5.7 Permitted pressure ratio Ratio of maximum operating pressure p 2 to gas pre-charge pressure p 0..5.8 approx. 0 % of the effective gas volume must remain in the accumulator. conditions and is not applicable in all operating conditions..5.9 Materials NBR Acrylonitrile butadiene rubber Material code Temperature range Resistant to 2-5 C... + 80 C Mineral oil (HL, HLP) groups HFA, HFB, HFC 5-50 C... + 50 C Water Not resistant to Aromatic hydrocarbons Chlorinated hydrocarbons (HFD-S) Amines and ketones ECO Ethylene oxide epichlorohydrin rubber 3-40 C... +20 C IIR Butyl rubber 4-50 C... +20 C FKM Fluorine rubber 6-0 C... +50 C see section 2.. Model code, material code, diaphragm others available on request Mineral oil (HL, HLP) HFB group Water group HFC Water Mineral oil (HL, HLP) Aromatic hydrocarbons Inorganic acids Aromatic hydrocarbons Chlorinated hydrocarbons (HFD-S) Amines and ketones groups HFA and HFC Mineral oils and mineral greases Aliphatic, chlorinated and aromatic hydrocarbons Amines and ketones Ammonia Skydrol and HyJet IV Steam 64
.5.0 in countries outside Germany are supplied country. The country of installation must be stated at the time of ordering. HYDAC pressure vessels can be supplied Please note that the permitted operating pressure can differ from the nominal pressure. examples of the codes used in the model code for different countries of installation: Country code (AKZ) E member states Australia F Belarus A6 Canada S China A9 Hong Kong A9 Iceland Japan P Korea (Republic) A T Russia A6 South Africa S2 Turkey kraine A0 SA S Registration required in the individual territories or provinces. others on request accumulator shell. After the hydraulic line has been connected it must be completely accumulators (repairs, connecting pressure gauges etc.) must only be carried released. The operating instruction must be followed! No. 3.00.BA Note: Application examples, accumulator sizing and extracts from approvals regulations on hydraulic accumulators can be found in the catalogue section: HYDAC Accumulator Technology No. 3.000 2. TECHNICAL SPECIFICATIONS 2.. MODEL CODE Not all combinations are possible. Order example. For further information, please contact HYDAC. Series Nominal volume [l] Type Weld type: E = rechargeable M28x.5 E2 = sealed gas connection, E3 = rechargeable, gas valve M6x.5 / M4x.5 Screw type A6 = rechargeable M28x.5, exchangeable diaphragm A3 = gas valve M6x.5 / M4x.5, exchangeable diaphragm Material code dependent on operating medium standard model = 2 for mineral oils Fluid connection = carbon steel 3 = stainless steel 3) 7 = other materials Accumulator shell 0 = plastic coating = carbon steel 3) 4) 4 = stainless steel 7 = other materials Diaphragm 2 = NBR 5) 3 = ECO 4 = IIR 5 = NBR 5) 6 = FKM 7 = other materials (e.g. PTFE, EPDM,...) = European Pressure Equipment Directive (PED) Permitted operating pressure [bar] Fluid connection form Standard connection = AK or AB e.g. form AK = G 3/4 for SBO20-2 see section 3. SBO20 2 E / 2 20 AK 050 Pre-charge pressure p 0 [bar] at 20 C, must be stated clearly, if required! dependent on type and pressure level 3) 4) 5) Observe temperature ranges see section.5. 65
3. TECHNICAL DATA 3.. WELD TYPE non-exchangeable diaphragms 3.. Drawings Fig. Design Gas side connection Fluid side connection* E E2 E3 AK AB +2 2 3 on request 4 66
3..2 Dimensions Nom. vol. Perm. press. ratio Permitt. oper. R pressure [bar] [l] p 2 : p 0 steel Carbon Series ØD Weight Q Stainless steel [kg] [l/min] Form AK F ISO 228 ØG L Form AB B F SW ISO 228 H DIN 3 0.075 8 : 250 250 9 64 0.7 38 G /2 4 2 30 0.6 8 : 20 20 80 03 74 0.8 38 G /2 4 2 30 300 300 08 78. not available 0.32 8 : 20 20 60 6 93.3 300 300 20 96.8 95 G /2 4 2 30 0.5 8 : 60 60 30 02.3 20 20 33 05.7 95 G /2 4 2 30 G /2 M33x.5 4 37 4 0.6 8 : 330 330 5 5 3.3 4 4 95 G /2 34 4 2 G /2 M33x.5 4 37 350 350 30 2 3.5 50 50 3 0.7 8 : 00 00 5 06.8 95 G /2 34 4 2 4 G /2 M33x.5 4 37 4 0.75 8 : 40 40 42 6.8 4 37 20 20 40 47 2 2.8 2 95 G /2 34 4 4 G /2 M33x.5 4 250 250 52 26 3.6 5 42 330 330 40 26 4 26 3 8 : 200 200 59 36 3.6 2 95 G /2 34 4 4 G /2 M33x.5 4 37 250 250 92 4.4 4 2 4 : 26 330 330 69 4.8 26 5 42 4.4 8 : 40 40 73 45 3.9 4 20 20 78 50 5.4 2 37 95 G /2 34 4 4 G /2 M33x.5 4 250 250 85 53 5.9 5 330 330 72 55 7.6 33 42 3 00 00 00 90 60 4 8 : 20 20 98 67 6.6 28 33 2 50 G 3/4 44 6 46 G 3/4 M45x.5 6 46 4 : 250 250 232 53 7.4 2 8 : 330 330 8 72 9.2 43 42 3 2.8 20 20 250 67 8.2 28 33 2 4 : 250 250 250 70 9.5 50 G 3/4 44 6 46 G 3/4 M45x.5 6 46 237 43 4 330 330 72 42 6 : 23 44 3 3.5 4 : 250 20 306 70.2 28 33 2 50 G 3/4 44 6 46 G 3/4 M45x.5 6 46 330 330 274 72 3.8 44 42 4 4 4 : 50 50 294 58 5 250 80 306 70.2 50 G 3/4 44 6 44 46 G 3/4 M45x.5 6 33 46 2 others on request L B2 SW Fig. 67
3.2. SCREW TYPE exchangeable diaphragm 3.2. Drawings Type A6 Type A3 Fluid port AK Figure 5 3.2.2 Dimensions Nom. vol. Perm. press. ratio Series [l] p 2 : p 0 steel Carbon Permitt. oper. pressure [bar] Weight A B ØD ØL M N O ØP R Q connection Stainless steel [kg] [l/min] Form AK F ISO 228 0. 0 : 500 500.9 0 30 95 53 35 95 G /2 4 36 500 500 3.9 5 56 29 20 92 56 0.25 0 : 350 4.9 25 60 95 G /2 4 36 750 750 9 36 53 4 57.5 63 M6 40 2 27 0.6 0 : 450 450 250 5.7 70 9 40 5 68 57 95 G /2 4 34 4.3 0 : 400 400.2 22 28 99 60 97 65 M8 80 0 50 G 3/4 6 44 50 2 0 : 250 250 80.4 227 7 20 68 0 64 M8 88 0 50 G 3/4 6 44 50 2.8 0 : 400 400 22 257 30 252 207 06 80 M8 230 0 50 G 3/4 6 44 50 4 0 : 400 400 34 284 30 287 236 27.5 90 M8 265 0 50 G 3/4 6 44 50 others on request S ØG K SW Figure 5 68
4. SPARE PARTS 4.. WELD TYPE non-exchangeable diaphragms Description Quantity Item 20 Protective cap 20 2 Seal ring 20 3 Nominal volume [l] Part no. NBR ECO FKM IIR PTFE 0.075-4 3262845 - - - - 4.2. SCREW TYPE exchangeable diaphragm Description Quantity Item 20 Protective cap 20 2 Seal ring 20 3 Spare parts kit for elastomer diaphragm Seal ring 3 Elastomer diaphragm 4a Back-up ring 5a Spare parts kit for PTFE diaphragm Seal ring 3 PTFE diaphragm 4b O-ring 5b Nominal volume [l] Part no. NBR ECO FKM IIR PTFE 0. - 4 3262845 - - - - Spare parts kit 0. 3042668 382526 - - - 0.25 3042709 304272 304274 304273 3504798 0.6 304270 304275 304277 304276 3550388.3 304268 3042682 3042684-3446897 2 30427 304279 304272 3042720 3464205 2.8 3042700 304270 3042704 3042702-4 3042705 3042706 3042708 3042707 - When replacing seals and/ or diaphragms, please read the Instructions for Assembly and Repair (No. 3.00.M). 4. NOTE The information in this brochure relates to the operating conditions and applications described. For applications or operating conditions not described, please contact HYQIP. 69