Aug 11,2023
Guangzhou Xiebang Machinery Co Ltd is a top seal kit manufacturer worldwide. Our business has profited from the potential of its skilled personnel and cutting-edge professional team, as well as its modernized equipment and highly sophisticated technology to make its premium kits.
Using an international team of quality examiners to regularly check our seal kits' quality regularly, it has implemented a production strategy that prioritizes quality. Quality control specialists lead our international quality evaluation team worldwide. You can contact us at for premium seal kits dealing.
In this blog post, we will deeply understand seal kits and their types.
Hydraulic cylinders, usually called hydraulic motors, are a form of machinery utilized in many industries, including manufacturing, machinery, and civil engineering. This hydraulic cylinder could have some gaps, making it less likely to operate normally.
Seal kits enter the picture in this situation. A seal kit comprises gaskets, seals, sealing rings, and other related parts that are crucial for a certain machine or unit. The gaps between the various components of the hydraulic cylinder are filled with hydraulic seal kits.
Static and dynamic hydraulic cylinder seals fall into two broad groups. Static seals are employed when the component components aren't intended to undergo relative movement. O-rings, D-rings, backup seals, and other seals designed to stay in a fixed relative place are among these seals.
Where the piston and the rod meet is often where one type of static seal is located. The piston has a static piston seal inside of it, and the rod passes through it. Hydraulic fluid cannot be forced through to the opposite side of the piston because of the impermeable seal created by the rod's pressure. This is crucial for single-action pistons since they only have hydraulic fluid on one side.
On the other hand, dynamic hydraulic cylinder seals are designed for applications with relative motion between two components. Because dynamic seals in your hydraulic cylinder serve various purposes, it's generally better to focus on a few of the individual seals you're most likely to encounter.
By stopping the hydraulic fluid from going past your piston, piston seals give your hydraulic cylinder its power. Piston seals are thus among the most crucial hydraulic cylinder seals in your system.
The seal created by a piston seal maintains contact between the piston and cylinder bore, helping to regulate cylinder motion and maintaining cylinder position even when it is loaded.
Single-action or double-action piston seals are also options. Since a single-action piston only has hydraulic fluid on one side, as was already said, the piston seal must always be very near to the bore to prevent fluid from leaking through and decreasing the efficacy of your cylinder.
As the name suggests, in double-acting cylinders, hydraulic fluid is present on both sides of the piston. As a result, a double-acting piston seal has a symmetrical form and the same sealing characteristics in both directions.
These seals can also add more space between the piston and the cylinder bore, as they are not designed to halt fluid leakage.
Rod seals provide two logically incompatible functions. They stop the cylinder from leaking hydraulic fluid when it is starting up.
However, these seals are also in charge of making sure that the piston rod is lightly lubricated. This not only prevents rust but also lubricates other crucial cylinder components.
Depending on the duty level of your cylinder, you could or might not also have a buffer seal, which is positioned beyond the rod seal and further into the cylinder.
These hydraulic cylinder seals are designed to level out internal pressure, preventing pressure spikes from outside influences. Additionally, they guard against impurities like metal flakes within the cylinder from harming your rod seals.
Wiper seals, also known as dust seals, excluders, or scrapers, safeguard your machinery by keeping foreign objects out of your cylinder while the piston rod retracts. The piston rod is protected against corrosion by a thin coating of fluid.
Still, your cylinder's internal parts might be seriously damaged very rapidly because of its ability to take up debris and other impurities. Wiper seals prevent these contaminants from entering your system.
These seals are designed to keep moving components in the correct place during relative motion.
Guide rings protect your equipment by preventing any metal-on-metal abrasion during operation and keeping the critical components correctly aligned.
These seals also defend against pollutants by protecting your more delicate seals from accelerated wear.
A variety of materials may be used to make hydraulic cylinder seals. Each material has unique qualities that make them more suitable for particular environments, such as high pressures, temperatures, and caustic chemicals. The many materials you could run into are listed below:
Rubber seals are employed when a high level of flexibility and compressibility is required. Dynamic cylinder seals are frequently made from nitrile butadiene rubber (NBR), Fluor elastomer (FKM), and hydrogenated nitrile butadiene rubber (HNBR). They will tolerate grease, mineral oils, and other hydraulic fluids.
Under harsh situations like high temperatures, high pressures, and caustic chemicals, PTFE Polytetrafluoroethylene (PTFE) offers exceptional durability. Additionally, PTFE requires less lubrication than conventional seals and may function well in dry situations due to its comparatively low coefficient of friction.
Plastic hydraulic cylinder seals, which come in a variety of materials, provide moderate resistance to temperature, pressure, and chemical reactivity. The quality of the material, which can range from high-performance plastics to customized polymers, which are superior to commodity plastic, largely determines the strength of a plastic seal. These seals concentrate more on bolstering the strength of your cylinder because they are less flexible than rubber or PTFE.
Thermoplastic elastomers, commonly known as TPEs, are materials that combine the tensile strength of plastic with the pliability of rubber. As a result, they are both highly durable and offer outstanding elasticity. These hydraulic cylinder seals can sustain a steady pressure for longer than other materials because of their exceptional resistance to wear and tear.
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