A drop-in signal accumulator piston assembly to replace an original equipment (OE) signal accumulator piston in a vehicle transmission hydraulic circuit, the OE signal accumulator piston positioned in a bore in a valve body having an open end and a fluid port. The drop-in signal accumulator piston assembly has a sleeve having open first and second ends. The sleeve is configured to be positioned within the bore of the valve body. A piston is positioned in the sleeve. A spring biases the piston towards the fluid port. A plug is positioned to removably retain the sleeve, the piston, and the spring within the bore and to prevent the sleeve from moving axially within the bore.

Separator and hydraulic accumulator having such a separator. A separator, in particular for a hydraulic accumulator, such as a bellows accumulator, which is produced by a 3D printing process, consisting of one single diaphragm, which, when viewed in cross section, is deflected in an arcuate shape to form a multitude of bellows pleats at deflection points, which delimit the bellows pleats on the outside and the inside, and in that, to obtain an isotensoid or essentially isotensoid stress profile in the diaphragm, the notional extensions of the diaphragm surfaces adjacent to each deflection point form an acute angle with each other, at least in an initial state.

A drop-in signal accumulator piston assembly to replace an original equipment (OE) signal accumulator piston in a vehicle transmission hydraulic circuit, the OE signal accumulator piston positioned in a bore in a valve body having an open end and a fluid port. The drop-in signal accumulator piston assembly has a sleeve having open first and second ends. The sleeve is configured to be positioned within the bore of the valve body. A piston is positioned in the sleeve. A spring biases the piston towards the fluid port. A plug is positioned to removably retain the sleeve, the piston, and the spring within the bore and to prevent the sleeve from moving axially within the bore.