Construction The bladder accumulator comprises a steel shell in which is fitted a bladder complete with a gas valve and a fluid port with the poppet valve. The Accumulator Shell is a pressure vessel forged from high grade steel designed and manufactured to meet the relevant international standards. The Bladder is molded into a single piece preventing problems associated with seamed designs. The re-usable valve reduces maintenance costs by not being an integral part of the bladder. Bladders are normally manufactured from nitrile, but for special applications a number of other materials are available. The Gas Valve is connected to the bladder by a rubber coated washer to ensure a gas tight joint, and a non-return valve is used for bladder inflation. The bladder, complete with the gas valve is attached to the accumulator shell by a lock nut. The Anti-Extrusion Valve prevents the bladder from extruding into the fluid port and allows the liquid to flow. With high pressure a poppet valve is used, while with low pressure a drilled disc is used. In the latter case the pre-charge pressure should not exceed 15 bar.