Bladder Accumulator. A bladder type accumulator contains an elastic barrier(bladder) between the oil and gas, as illustrated in Figure 11.9.The bladder is fitted in the accumulator by means of a vulcanized gas-valve element and can be installed or removed through the shell opening at the poppet valve. The poppet valve closes the inlet when the accumulator bladder is fully expanded. This prevents the bladder from being pressed into the opening The greatest advantage of this type of accumulator is the positive sealing between the gas and oil chambers. The lightweight bladder provides quick response for pressure regulating, pump pulsation, and shock-dampening applications.