It is a daunting task to select the right seals for any heavy-duty application without incorporating high-level expertise of a manufacturer or hydraulic seal supplier. They have deep technical and engineering know-how in this field. Hence, machines operating in very harsh conditions will often encounter wide changes in pressure and temperature shock leads, and in some cases, side loads do present major challenges to, for example, cylinders wiper seal for hydraulic. Most commonly used are piston, rod, and wiper seals as used in heavy-duty applications.
Why are Piston seals preferred?
Piston seals are preferred due to the amount of time, pressure, direction, and work to be done by the hydraulic cylinder. The challenge is that the hydraulic seal and supplies materials must maintain a tight contact with the cylinder bore to prevent any leakage as well as wear due to friction produced by the sliding motion with that bore. Any internal leakage wastes energy can cause the piston to drift from a stationary position. It can as well reduce retraction and extension speed making positioning difficult.
Piston seals are used with joined or separate back-up rings and guide rings. The guide rings are made of resin-bonded fabric and engineered plastics that steer the piston in the cylinder bore and the rod in the cylinder head of a hydraulic cylinder. These guide rings do damage prevention from side loading by preventing any contact between metallic components. Hydraulic seal suppliers should supply Piston seals that are designed for high temperature and high-pressure environments. These require hydraulic seals and supplies materials for applications where the ability to hold positions without drift is important and this is in environments such as long wall mining roof support.
Piston rod seals are of different design since one side seals against ambient temperature. Fluid leakages past the rod seal reduce equipment performance and in some cases environmental issues. The seal should also prevent the entry of contaminants into the hydraulic system as well as minimize wear due to repeated sliding motion against the rod surface. In the case of rod seals, hydraulic cylinders have hydraulic seals and supplies that protect the main rod seal from high-frequency pressure spikes and shock pressure loading. The protection seal should not cause a pressure trap between itself and the main seal. It should allow adequate lubrication of the main seal. There are major materials used in the manufacture of single and double-acting piston seals, and they include polyurethane, polyester elastomers, and rubber-fabric composite.
Uses of Wiper seals for hydraulic cylinders
Wiper seals for hydraulic cylinders are commonly used in dirty environments to prevent contaminants such as moisture and dirt from entering the hydraulic system when the piston rod retracts. Contamination usually causes a lot of damage to the cylinder wall and other hydraulic seals and supplies in the hydraulic system. There is a major cause of unplanned seal and component failure. Wiper seals for hydraulic cylinders are used in mobile equipment that is specifically for use in heavily contaminated environments such as off-highway equipment, agriculture, forestry, and longwall mining.
However, hydraulic seal suppliers, especially for wiper seals, do have an Umbrella Wiper Technology, which is a protective guard flap for debris and slurry trap that often occurs with the conventional wipers.
With the advancement of roadways, railways, and utilities, there is an increased demand for specialized machines called tunnel boring machines that are huge and can excavate soil, rocks, and mud in their path. These also include any other materials they will encounter in their path. Many high-performance hydraulic seals and supplies contain pressurized fluid to keep it in motion in this environment and have the highest level of protection from those excavated materials.