Mid-Day Seal Kit for Hydraulic Cylinder
We offer industry-leading high performance hydraulic cylinder sealing kits designed for reciprocating motion applications to ensure your equipment remains stable and reliable under the most demanding working conditions.
Do you know the true cost of sealing problems?
Many companies only see the direct cost of replacing seals, but overlook the huge hidden losses behind the scenes. Unplanned downtime due to seal failure can cost a production line tens of thousands of dollars or more per hour.
Continuous replenishment of hydraulic oil, system damage caused by contamination, labor costs for emergency repairs, and customer penalties for delivery delays are all knock-on effects of poor seal quality. More seriously, environmental pollution may lead to regulatory fines and corporate image damage.
Investing in a high quality seal kit is not just about buying parts, it is about making informed decisions about the stability and long-term profitability of your business. A preventative sealing program can significantly reduce the total cost of ownership.
Why High Performance Seal Sets?
In industrial applications, seal failure can lead to production downtime, environmental contamination and costly repairs. High-quality seal packages not only extend equipment life, but also improve overall system efficiency and reduce total cost of ownership.
Sealing solutions are rigorously tested to maintain excellent performance under extreme conditions, providing the most reliable protection for your production line.
Radial Shaft Seal (Oil Seal)
First line of defense against hydraulic oil leakage
Spring-Assisted Rotary Seal
Provides stable sealing pressure and compensates for wear.
Anti-extrusion/Support Ring
Protect seals from high pressure extrusion deformation
Static Auxiliary Ring
Ensure that the fixed parts are completely sealed without leakage
These four core components complement each other to form a complete seal protection system. Each component has been precisely designed and material selected to ensure optimum sealing effect and service life during repetitive motion.
Functions and Principles
A radial shaft seal, commonly known as an oil seal, is a key component in a hydraulic cylinder to prevent oil leakage. It is installed between the piston rod and the cylinder barrel and utilizes the tight contact between the lip and the shaft surface to form an effective sealing barrier.
High-quality oil seals are made of special rubber materials and precision molds to ensure that the lips have proper contact pressure and elasticity. In the reciprocating motion, the lip can automatically compensate for wear and maintain a stable sealing effect, while minimizing the coefficient of friction and prolonging the service life.
Pain: Rapid lip abrasion
Standard oil seals wear out quickly at high speeds or high temperatures, resulting in leakage and high maintenance frequency, which affects productivity.
The mid-day solution
Adopting wear-resistant polyurethane or fluorine rubber material, with surface strengthening treatment technology, greatly enhancing wear resistance and extending service life by 3-5 times.
Benefits: Reduced maintenance costs
Longer replacement cycles mean less downtime for maintenance, lower labor costs, and higher equipment availability, creating tangible benefits for the business.
High-performance materials
Selection of top grade elastomer materials such as NBR, FKM, PU, etc. The most suitable material is chosen according to the application environment, which ensures that the excellent performance is maintained in the temperature range of -40°C to +200°C. Excellent resistance to aging, oil and chemical corrosion.
Precision lip design
CAE simulation is used to optimize the lip geometry to ensure uniform contact pressure distribution. Unique secondary lip design effectively blocks the intrusion of external contaminants while maintaining a very low coefficient of friction to reduce energy consumption.
Reinforced metal skeleton
Built-in high-strength metal skeleton provides a stable support structure and prevents deformation under high pressure. Precise stamping process ensures perfect bonding of the skeleton with the rubber, which will not fall off even under severe vibration environment.
Surface treatment technology
The lip surface is specially treated to form a micron-sized lubrication layer, which significantly reduces start-up and running friction. Good sealing performance is maintained even under dry running or extreme loading conditions.
Why do I need a spring force multiplier?
Conventional seals rely on the elasticity of the material itself to provide sealing pressure, but with wear and aging, the sealing force will gradually decline. Spring-loaded rotary seals provide consistent radial pressure through built-in stainless steel springs.
This design ensures that even if the seals wear, the spring will automatically compensate and maintain a constant contact pressure. It is especially suitable for applications with high speed rotation, large pressure fluctuations, or severe temperature changes.
Unique Design Advantages
The spring booster seals of mid-day are made of PTFE base material with different fillers, providing excellent low friction performance and chemical resistance. The spring material is specially treated to maintain long-term elasticity in corrosive environments.
The fit of the sealing lip to the spring is precisely calculated to ensure a consistent seal throughout the service life, significantly reducing the risk of accidental leakage.
Challenge: Stressful fluctuations
When system pressure changes frequently, conventional seals are unable to respond quickly, resulting in instantaneous leakage or increased wear due to excessive sealing forces.
Challenge: Wear Compensation
After the sealing surface is worn, the contact pressure decreases and the sealing effect deteriorates. Frequent replacement is required to maintain performance, increasing maintenance costs.
Solution: Automatic compensation
The spring provides continuous compensation force, automatically adapts to wear and pressure changes, maintains stable sealing pressure, and extends service life.
Benefits:Extra long life
Compared with traditional seals, the service life can be extended by 5-10 times, which significantly reduces maintenance frequency and downtime, and improves the overall economic efficiency.
Extremely low coefficient of friction
PTFE material with precision spring design, the coefficient of friction is as low as 0.05, which significantly reduces drive energy consumption. In high-speed rotary applications, it can effectively reduce heat generation and prevent seal failure. Suitable for precision equipment requiring high performance and energy saving.
Wide temperature adaptability
Stable operation in the extreme temperature range of -200°C to +260°C. Specially filled PTFE material remains flexible at low temperatures and does not soften and deform at high temperatures. Spring material is tested to ensure reliable sealing force in any environment.
Excellent chemical compatibility
PTFE has excellent chemical resistance to virtually all acids, alkalis, solvents and corrosive fluids. Stainless steel springs are surface-treated for long-term use in harsh chemical environments without corrosion. They are suitable for use in demanding industries such as petrochemical and chemical industries.
The Invisible Guardians of High Pressure
In high pressure hydraulic systems, seals are subjected to tremendous pressure and can easily be pushed into the gap between the piston and cylinder, causing permanent deformation or even tearing. This phenomenon is called "extrusion" and is one of the main causes of seal failure in high pressure applications.
An anti-extrusion ring, also known as a support ring, is installed on both sides of the seal to provide a strong support to prevent the seal material from flowing and deforming under pressure. It acts as a strong guardrail to protect the flexible seal from damage caused by extrusion.
The anti-extrusion ring of the mid-day glare is made of high-strength engineering plastics or filled PTFE, with excellent pressure resistance and low friction characteristics, and can provide reliable protection under ultra-high-pressure environments of more than 400 bar.
Problem:High-pressure extrusion damage
When the system pressure exceeds 300 bar, the O-ring and other elastic seals are easily pushed into the gap, resulting in biting, tearing, or even the failure of the entire sealing system, leading to serious leakage.
Solution: Structural Support
The anti-extrusion ring is installed on the pressure side of the seal and provides a rigid support surface that prevents sealing material from flowing into the gap, protecting the integrity of the seal even under extremely high pressures.
Benefit: Significant increase in system reliability
With the protection of the anti-extrusion ring, the sealing system can be stabilized under higher pressure, significantly reducing the risk of unplanned downtime and extending the overall maintenance cycle to ensure production continuity.
PTFE-filled materials
Filled PTFE with glass fiber, carbon fiber or bronze powder combines the low friction of PTFE with the high strength of the filler to withstand high pressures while maintaining excellent sliding performance for high speed reciprocating motion.
Polyurethane/Engineering Plastics
Highly rigid polyurethane or engineering plastics such as POM, PEEK, etc. provide excellent extrusion resistance. The material is modified to maintain dimensional stability under high loads, making it suitable for heavy-duty equipment in extreme operating conditions.Split Design
For the occasion of difficult assembly, the bearing provides split anti-extrusion ring, simplifies the installation process, reduces the risk of damage to seals during assembly, and at the same time, maintains the complete support performance and enhances maintenance efficiency.Ensure perfect sealing of fixed parts
In hydraulic cylinders, not only the moving parts need to be sealed, but also the sealing of fixed parts is equally important. Static assist rings are installed on the cylinder head and cylinder barrel, flange connection, etc., where no relative movement occurs, to prevent oil leakage from the fixed joint surfaces.
Although static seals have no frictional wear problems, they must be able to withstand the thermal expansion and contraction caused by changes in system pressure and temperature, as well as the compression and deformation during assembly. Improper static seals can lead to oil leakage, contamination and even structural failure.
Xin provides a wide range of static sealing solutions, including O-ring, X-ring, square ring, etc., the material covers NBR, FKM, EPDM, silicone, etc., which can be accurately selected according to the type of fluid, temperature range, and pressure level to ensure that no water leakage occurs at each connection point.
Material Selection
The appropriate material is selected according to the fluid to be contacted and the operating temperature. NBR for mineral oils, FKM for synthetic oils, and EPDM for water-based media. material compatibility is the first element of a successful static seal.
Compression rate control
Static seals usually have a compression ratio of 15-30%. Too small to seal and too large to cause permanent deformation. The company provides precise groove design guidelines to ensure that the optimum compression ratio is achieved.
Surface treatment
The surface roughness and cleanliness of the sealing surface directly affect the sealing effect. It is recommended that the sealing surface roughness Ra ≤ 0.8μm, thoroughly cleaned before installation to remove burrs and pollutants.
Temperature compensation
Consider the expansion and contraction of materials caused by temperature changes. Select materials with appropriate thermal expansion coefficients and leave enough space for temperature compensation in the design to avoid excessive compression or relaxation.
Don't let the sealing problem continue to affect your production efficiency and cost control. Xin's high-performance hydraulic cylinder sealing set combines the four core technologies of radial shaft seals, spring-enhanced rotary seals, anti-extrusion rings and static auxiliary rings to provide you with a full range of sealing protection.
Our professional team is always ready to provide you with technical advice and selection suggestions. Whatever your sealing challenge, we have the experience and solutions to help you find the right sealing configuration.
Contact us, let Cheng Hsin become your reliable sealing technology partner, jointly improve equipment reliability, reduce operating costs, and create greater business value.