E 3.100.23/04.09531. DEscription1.1 FunctionFluids are practically incompressible and cannot therefore store pressure energy.the compressibility of a gas is utilised in hydraulic accumulators for storing fluids. HYDAc diaphragm accumulators are based on this principle, using nitrogen as the compressible medium.A diaphragm accumulator consists of a fluid section and a gas section with the diaphragm acting as the gas-proof screen.The fluid section is connected to the hydraulic circuit so that the diaphragm accumulator draws in fluid when the pressure increases and the gas is compressed. When the pressure drops, the compressed gas expands and forces the stored fluid into the circuit.At the base of the diaphragm is a valve poppet. this shuts off the hydraulic outlet when the accumulator is completely empty and thus prevents damage to the diaphragm.notEHYDAC diaphragm accumulators when fitted with a HYDAC Safety and Shut-off Block comply with the regulations of the Pressure Equipment Directive PED 97/23/Ec and the German industrial safety regulations Betr.Sich.V. See catalogue section:Safety and Shut-off Block SAF/DSV zno. 3.551Hydraulic Diaphragm Accumulators1.2. DeSignHYDAc diaphragm accumulators are available in two versions.1.2.1 Weld typeThis consists of:welded pressure vessel, rechargeable zon the gas side or, alternatively, completely sealed. Fluid connection available in various typesflexible diaphragm to separate the fluid zand gas sectionsvalve poppet set into the base of the zdiaphragm1.2.2 screw typeThis consists of:forged upper section with gas charging zconnectionforged lower section with fluid zconnectionexchangeable flexible diaphragm to zseparate the gas and fluidvulcanized valve poppet set into the zbase of the ...
