WipersA wiper is a type of seal used to exclude contaminants from entering the cylinder. Besides direct wear to the rod seal, external contamination, if allowed to enter a hydraulic system, can have disastrous consequences. Contaminated hydraulic fluid can quickly wear out seals, clog filters, and damage machined surfaces. A disadvantage of a wiper is that it can induce a pressure difference between the wiper and the main rod seal, which can cause either the wiper or rod seal to be ejected from its groove.
RT/Dygert sells many different kinds of wipers, from relatively low pressure solid nitrile wipers, all the way up to heavy duty metal clad ones. Many are also available in a wide variety of materials depending on they type of fluid, or operating conditions the wiper will see.