A synchronous cylinder (also referred to as a velocity cylinder or a double rod cylinder) has a piston rod on both sides of the piston surface. The volume of the hydraulic oil flowing in and out is therefore always of equal size, which thus means that it also moves in and out at the same velocity. Synchronous cylinders can also be implemented with only one piston rod. In such cases, a special shape of piston rod with internal bore holes ensures that the surface dimensions are equal. more information under
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