Seal designed to seal the piston rod for a differential piston or the plunger piston in relation to the outside. A great deal is demanded of them, because they need to offer an almost perfect seal under any operating conditions.
For the most part, lip seals, roof-shaped seals and compact seals are used as piston rod seals, and these are suitable for their task of providing a seal in relation to the inside. All the various materials for seals are available for this purpose.