- When the accumulator contains a reserve of fluid under pressure, the diaphragm is in a
certain position and the gas is compressed to a pressure higher than that of its initial
inflation. On either side of the diaphragm, gas and fluid are at the same pressure and the
diaphragm is in a state of equillbrium.
- When fluid is used (a drop in volume and pressure of the fluid), the compressed gas
expands to compensate for these changes and the flexible diaphragm takes up a different
position of equilibrium. The gas and fluid are still at identical pressures, but of a
- This condition continues until the initial inflation pressure of the accumulator is
reached. Then the diaphragm comes into contact with the shell of the accumulator.
NOTE : The flexible diaphragm plays a passive role in the work of the accumulator,
simply that of separating the gas and fluid.