Cylinder types
Rephasing cylinders are used in applications where the synchronisation of two or more cylinders are required to lift a load evenly without the use of large interconnecting frames or rocker shafts.
By using rephasing cylinders paired together in a ‘Master’ and ‘Slave’ configuration, this can be accurately and simply achieved.
The concept is simple; by powering the piston side on the master cylinder, the displacement of the annular (head/gland side, which equals the full-bore volume, minus the shaft) into the equally matched piston side of the slave, creates equal movement. Using standard components, the theoretical accuracy is between 0-2%. Any discrepancy over the course of the stroke is rephased or reset to equalize all cylinders in the series.
Motus offers two ranges of rephasing cylinders the Accura BP and the Accura BP which are detailed in the following pages.
The Accura PV series achieves rephasing by a precision poppet valve (1) mounted internally on the piston incorporating a double check-valve. It remains completely locked when in mid-stroke but then allows bypass when activated by contacting the head or base at full extention or retraction.
The Accura BP series rephases by allowing the piston seal to bypass one of the double port holes (2) in the rephasing port. This action enables excess oil to bypass over, resetting the cylinder.
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