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Hydraulic Cylinder Seals Types Guide

Views:7     Author:Brian Wu     Publish Time: 2020-12-12      Origin:Jiangmen Great Fluid Seals Co., Ltd


HYDRAULIC SEALS AND PNEUMATIC SEALS ARE DESIGNED AS PER THE CYLINDER WORKING PRESSURE, CYLINDER SPEED, OPERATING TEMPERATURE, WORKING MEDIUM AND APPLICATION.

hydraulic seals China

HYDRAULIC SEALS AND PNEUMATIC SEALS ARE DESIGNED AS PER THE CYLINDER WORKING PRESSURE, CYLINDER SPEED, OPERATING TEMPERATURE, WORKING MEDIUM AND APPLICATION.

Hydraulic seals are generally relatively soft, non-metallic rings captured in groove or fixed in a combination of rings, forming a seal assembly, to block or separate fluid in reciprocating motion applications. Hydraulic seals are vital in machinery. Their use is critical in providing a way for fluid power to be converted to linear motion.

Hydraulic seals can be made from a variety of materials such as polyurethane, rubber or PTFE. The type of material is determined by the specific operating conditions or limits due to fluid type, pressure, fluid chemical compatibility or temperature.

A static hydraulic seal is located in a groove and sees no movement – only sealing within its confined space, acting like gasket.

A type of dynamic hydraulic seal called a rod seal is exposed to movement on its inner diameter along the shaft or rod of a hydraulic cylinder. A type of dynamic hydraulic seal called a piston seal is exposed to movement on its outer diameter along the tube or bore of a hydraulic cylinder.

PISTON SEALS

Hydraulic Piston Seals seals ensure fluid or other media does not by-pass the piston as the system pressure pushes the piston down the cylinder during a pressure cycle.

Piston seals are dynamic seals, typically single-acting (pressure acting on one side only) and double-acting (pressure acting on both sides) seals. The choice of piston seal is determined by the way in which the cylinder operates. 

ROD SEALS

Rod seals are considered the most critical element of a cylinder sealing system. They prevent the leakage of fluid from within a hydraulic cylinder to the outside as the rod cycles back and forth (dynamic pressure sealing). Rod seals work together with wiper seals to protect a hydraulic system against external contaminants such as dirt and outside weather conditions.

Rod seals are static seals installed in the glands or housings. They maintain a seal with the piston rod in dynamic motion.

WIPER SEALS

Wiper seals are also known as Scraper seals. They tend to be used in conjunction with other sealing elements. Wiper seals create a tight fit whilst still allowing a reciprocating ram rod to pass through the inner bore of the seal. Despite it’s important function, the wiper seal is possibly the most undervalued seal type in the hydraulic cylinder.

WEAR RINGS

Wear rings are used to help keep the piston centered, which allows for even wear and pressure distribution on the seals. These seals are used in both piston and rod applications. Popular wear ring materials include glass filled Nylon, bronze filled PTFE and glass filled PTFE. Wear rings are available in butt cut, angle cut and step cut styles.



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