| Customization: | Available |
|---|---|
| Material: | NBR, FKM, Sil, EPDM, HNBR, Cr, Acm, etc |
| Usage: | Engine, Transmission, Rear Axle |
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Pneumatic and Hydraulic seals are rings that are designed to seal areas between the components inside a hydraulic cylinder. A hydraulic cylinder contains many different components, some of which are exposed to high pressure, high temperature and fluids. Hydraulic seals are designed to fit the specific components in a hydraulic cylinder while creating a leak-proof seal around them, to prevent fluid from leaking around these components.
Hydraulic seals are either static or dynamic, depending on their application. Both seal types are used in hydraulic cylinders. The difference is that static seals remain stationary, whereas dynamic seals are exposed to motion.
Static hydraulic seals
They are used in applications where the element with which it's used doesn't move. The static hydraulic seals are not exposed to movement, but they are still exposed to high pressure.
Dynamic hydraulic seals
On the other hand, Dynamic seals are exposed to movement.
Ex. Rod seals are a type of dynamic hydraulic seal. A piston rod is a moving part, and the Rod seals are designed to seal these piston rods.
You can find hydraulic seals available in several materials such as:
Shared for all is their ability to withstand high pressure and high temperatures. They have also very good sealing capability against leaks and are very combability with chemicals.
Piston Seals
Piston seals prevent fluid or other media to by-pass the piston as the system pressure pushes the piston down the cylinder during a pressure cycle. They are generally single-acting seals, which means the stress acts only on one side; and double-acting seals, which means the stress acts on both sides.
Rod Seals
Rod seals are deliberated to be the most substantial component of a cylinder sealing configuration. The seals help prevent pressurized hydraulic fluid within the cylinder from leaking. In addition to keeping fluid from leaking, seals also help keep dirt and contaminants out of the cylinder, which extends the lifespan of the cylinder.
Wiper Seals
Wiper seals (also called Scraper Seals) generally are used together with other sealing components such as the rod seal. Their function is to scrape of dirt from the rod and to prevent dirt to enter the cylinder.
Wear Rings
Wear rings (also called Guide-ring) are used to keep the piston centralized. The Wear ring makes sure to grants for equal and even wear, and stress allotment on the seals. They are used together with Rod and Piston seals installations.
At HB Seals we supply seals for Hydraulic and Pneumatic cylinders. Manufactured properties include Ultra-low friction, wide temperature range, water resistance, and ultra-long life. See our selection or contact us, if you want to know more about seals on bespoke.
U-Ring Seals (also called U-seals, U-cup, and Symmetrical seals) is a multipurpose seal that can be fitted either on a rod or a piston cylinder and has a unique "U" shaped profile. Both the outer and inner sealing lips are designed to optimize both rod and piston sealing applications.
The outer static lip seal functions against mating surfaces that have no relative motion between each other. The inside of the U-Seal is a dynamic lip seal that is used where there is motion between surfaces. The "U" shape energizes the sealing lips as the application pressure increases.
The outside is a static lip seal that functions against mating surfaces that have no relative motion between each other. The inside of the U-Seal is a dynamic lip seal that is used for when there is motion between surfaces. The "U" shape energizes the sealing lips as the application pressure increases.
The primary reason for the existence of U-rings is its interchangeability between rod and piston applications.
The U-Rings have high sealing properties and excellent resistance to abrasion, friction, and wear. Its use is recommended with hydraulic oils, mineral oil-based hydraulic fluids, lubrication oils and HFA/ HFB fluids.
Loaded
A loaded U-ring is loaded with an O-ring or sometimes a quad ring, between the two lips of some seals and help increase the sealing force at low pressures while blocking or separating fluid in reciprocating motion applications.
The loaded U-Cup is that when you add a "loader or energizer" to a lip seal, you turn it into a squeeze seal. This provides high sealing force at low pressure. As the system pressure increases, the lip loading also increases, automatically compensating for the higher pressure while maintaining a positive seal
Unloaded
With an unloaded U-ring, the seal is simply not loaded with an O-ring or a quad ring inside.
Rod seals are used in hydraulic and pneumatic cylinders and is one of the most critical seals on any type of fluid power equipment. The seals help prevent pressurized hydraulic fluid within the cylinder from leaking. In addition to keeping fluid from leaking, seals also help keep dirt and contaminants out of the cylinder, which extends the lifespan of the cylinder.
Rod Seals are typically single acting/uni-directional but can also be provided in a double acting/bi-directional configuration if the application demands. It's and dynamic seal that are installed inside the cylinder gland or housing and provide a tight seal against the piston rod.
Rod seals perform the difficult balancing act of creating a seal at both high and low pressure, often in combination with alternating high and low temperatures. Therefore, it is important to select the correct material and profile of the rod seal to align with the application's requirement.
Contamination is the most common reason for hydraulic system failure. To prevent this and to give the best sealing performance a rod seal is paired with an appropriate wiper/scraper. This will create a second layer of protection which protect a hydraulic system against external contaminants such as dirt and outside weather conditions
Particular attention should be paid when pairing the rod seal and the wiper seal. For example, if a rod seal is paired with an aggressive wiper, the wiper can scrape off the thin film of oil that remains on the rod during the return stroke after the rod passes through the rod seal, resulting in system leakage.
In heavier duty applications, a rod seal can be combined with a secondary buffer seal for a more robust sealing effect.
HB Seals have Rod seals available in stock in a variety of high-performance materials to suit a wide range of operating conditions such as temperature, and fluids.
Piston Seals or Piston Rings are used in hydraulic or pneumatic cylinder for fluid sealing to prevent fluid or other media to by-pass the piston as the system pressure pushes the piston down the cylinder during a pressure cycle. Piston seals support sealing contact between a piston and cylinder bore. The fluid generates generates high pressure on the piston seal which increases contact forces between the seal and cylinder surface. For this reason, the correct choice of piston seal is an important factor when designing or repairing a hydraulic or pneumatic cylinder.
Single-acting
Single-acting pistons only hold pressure on one side of the piston. The seal is required to retain pressure from that direction, which then moves the piston along the cylinder. A single acting/uni-directional piston seal will have only one sealing lip that is in contact with the cylinder wall or bore.
Double-acting
The best sealing ability of a double-acting cylinder, capable of sealing dynamic pressure from both sides (bidirectional), is achieved by choosing a double-acting seal. A double acting/bi-directional piston seal will have two separate sealing lips, one for each side of the piston head.
Double-acting pistons hold pressure on both sides of a piston without leakage. They allow maximum mechanical effort to moving the piston along the bore of a cylinder.
Piston seals, both single and double-acting, can be designed for and used with integrated or separate back-up rings and guide rings.
HB Seals offers a wide range of high-performance piston seals in a variety of materials and can engineer a solution for the most arduous of applications.
The material you choose will depend on the application and the conditions the seal will be exposed to. Reach out to us if you need guidance in choosing the right material for your application.
Wiper seals are also known as Scraper seals and tend to be used in conjunction with other sealing elements. It is possibly the most undervalued seal type in the pneumatic and hydraulic cylinder.
One of the largest causes of damage and failure in a hydraulic system is contamination from external sources; therefore, the correct choice of wiper seals should be considered a priority for the design engineer or RAM repairer.
The main function of a Wiper Seal (as its name suggests) is to wipe or scrape debris from the piston rod to prevent foreign particles such as dust, dirt, mud, sand, moisture, and other components from entering the sealing system.
The wiper seal creates a tight fit whilst still allowing a reciprocating ram rod to pass through the inner bore of the seal.
By preventing this ingress, wiper seals prevent possible scratches and damage occurring to the piston rod and cylinder bore. This thoroughly extends the working life and leak-free performance of the other sealing components in the hydraulic or pneumatic system.
The common material for wipers is polyurethane. Metallic scrapers may be used for subzero temperature applications, and particularly arduous applications where foreign materials can deposit on the rod.
HB Seals provide Wiper Seals to suit all applications, if you require a reliable solution to your contamination problems then we have the solution.
HB Seals is committed to providing customers with the best possible sealing solutions for every industry, including our wiper seals. If you don't find the correct seal for your application, then please contact our team.
A wear ring is also called a guide ring. M Seals manufactures wear rings for rod and pistons with precise tolerance from a variety of materials such as Lubricated Polyester fabric Laminate, Reinforced Polyacetal, Lubricated Nylons, PEEK, PTFE and Polyimide.
The main characteristics of M Seals wear rings are:
Our wear rings are particularly suitable for replacing traditional soft metal bearings as the low friction benefits, enable them to operate effectively in conditions of minimal lubrication. The wear rings are recommended to be used in the following conditions:
|
P |
(Kg) |
Max radial load |
|
D |
(cm) |
Ring diameter subject to dynamic movement |
|
E |
(cm) |
Ring axial width |
|
Ps |
(Bar) |
370 Bar (ASTM D.695) maximum permissible loading for material. |
To ensure long life of the wear rings the surface finishes must not exceed those indicated for the seal being used.
In the free condition, the wear rings are split and will naturally spring out of round. To avoid potential damage during assembly, recommended lead-in chamfers should be incorporated in the end of the cylinder bore or rod ends.
Details of lead-in chamfers are given for the specific seals and the relevant catalogue will recommended the correct details.
No special instructions are necessary although lubrication is desirable and attention to cleanliness is important.
Different Type Rotary Shaft Oil Seal
| Different Type Rotary Shaft Oil Seal | ||||
| Type | Material | Lip | Spring | Feature |
| TC | NBR & FKM | Double Lips | Single | Metal Coverd Rubber |
| TB | NBR | Double Lips | Single | Metal Case |
| TA | NBR | Double Lips | Single | Metal Case |
| SC | NBR & FKM | Single | Single | Double Metal Shell |
| SB | NBR | Single | Single | Metal Case |
| SA | NBR | Single | Single | Double Metal Shell |
| DC | NBR | Double Lips | Double | Double Springs |
| VC | NBR & FKM | Single | Without | Metal Coverd Rubber |
| VB | NBR | Single | Without | Metal Case |
| TCV | NBR | Double Lips | Single | High Pressure |
| TCN | NBR | Double Lips | Single | High Pressure |
| PTFE | PTFE | Single & Double Lips | Without | Stainless steel |
| HTCL | NBR & FKM | Double Lips | Single | Inside thread L |
| HTCR | NBR & FKM | Double Lips | Single | Inside thread R |
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