The ABVE bottle type acccumulators consist of:

a forged steel body,
a bladder,
a charging valve,
an oil side orifice fitted with a poppet valve which prevents extrusion of the bladder, and an air bleed screw used during system start-up.

 Advantages:

Bladder accumulator component parts are interchangeable with those of major accumulators available.
Dimensions allow for easy installation and also use in batteries.