Hydraulic seals manufacturers including mechanical seals, oil seal, rubber seals, o-ring seals, Teflon¨ seal, and metric seals.  

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About Hydraulic Seals

A seal is a ring-shaped component that is designed to prohibit or limit the leakage of fluid from a device. Various types of seals are used in applications that have constantly moving equipment, such as the rotating or reciprocating shafts and cylinders that are an essential part of hydraulic and pneumatic systems. Devices that use seals include hydraulic rams and mixers, brake devices, valves, clean rooms, conveyors and test equipment. Hydraulic seal manufacturers generally make their products from are rubber or metal, and in some cases leather or felt. Some of the rubber materials used to create seals are nitrile, silicone, natural rubber, butyl and styrene butadiene. Additionally, quite a few hydraulic seal manufacturers use their own unique materials that they have specially developed for their products.

Different kinds of hydraulic seals exist for numerous purposes and applications. Oil seals are common hydraulic seals. They are used to retain oil and other lubricants in rotary applications and prevent leaks. Many of these operate with a flexible lip that rubs against the shaft or housing to provide a tight seal against leakage. Mechanical seals are used in applications that have a rotating shaft under a state of high pressure, temperature and speed. These hydraulic seals are used to prohibit fluid leakage for such mechanisms as agitators, pumps, mixers and cryogenic seals. Hydraulic seal manufacturers create many products that are application specific and specially designed to prevent leaks under very particular circumstances.

The distinctive types of sealing positions and directions that are used for hydraulic and pneumatic seals are axial seal, rod or internal seal, external or symmetric seal, or piston. The sealing direction is instrumental for hydraulic seals and pneumatic seals in mechanisms that use axial movement, such as cylinders and pistons. Because the action may be single or double, a seal can be used for one or two directions. One of these types, the rod seal, is radial and is press fitted into the housing bore. Another, the axial seal, has the function to axially seal an adjoining housing or other mechanical component.

When purchasing hydraulic seals, there are some important factors to consider, such as the diameter of the housing bore and the inner or outer seal, the dimension of the outer shaft and the axial or radial cross section needed for the application. Also, keep in mind certain operating parameters like the working temperature, vacuum rating and highest working speed and pressure. There are many types of hydraulic seals for different uses in industries. Some of the particular industries that make use of these seals include medical and pharmaceutical, waste disposal, aerospace, marine, food and chemical processing, automotive, military, nuclear and pulp and paper mills.

Images Provided by Allied Metrics Seals & Fasteners, Inc.

Featured Articles

"Leak-Free Hydraulic Plumbing"
http://www.machinerylubrication.com/article_detail.asp?articleid=471&relatedbookgroup=Hydraulics

"The Top Four Causes of Hydraulic Seal Failure in Cylinders"
http://www.insidersecretstohydraulics.com/hydraulic-seal.html

Types of Hydraulic Seals

• Balanced seals are seals that are designed to reduce the effects of hydraulic pressure in the seal compartment.
  
• Bellows seals use a formed or welded bellows to supply a secondary sealing and spring loading.
  
• Bidirectional pressure seals uniformly seal in response to pressure from both directions. Bidirectional pressure seals are also known as "double balanced seals" or "reversible balanced seals."
  
• Dynamic seals stop leakage past components that are in relative motion.
  
• Isolators are a type of bearing seal used in place of oil seals to supply greater reliability.
  
• Lip seals are versatile and high-performance seals used for uniform, low-pressure sealing.
  
• Mechanical seals prohibit fluid leakage around the rotating shaft in a state of extreme pressure, temperature and shaft speed. Typical uses for mechanical seals are for agitators, pumps, mixers and cryogenic seals.
  
• Metric oil seals are available in a wide variety of sizes, all measured in metric units.
  
• Oil seals and grease seals are seals with flexible lips that when placed to a housing or shaft prohibit the escape of fluids or prevent contaminants from entering. Certain grease and oil seals are equipped with a spring to aid in maintaining contact of the seal with the shaft.
  
• O-ring seals are sealing rings that have a circular cross section that is either solid or hollow. O-ring seals are used as secondary seals for many mechanical seals.
  
• Rubber seals are seals that are made from rubber materials, such as nitrile, viton, natural rubber and hypalon, among others.
  
• Teflon® seals are seals that have been made from Teflon® or are coated with Teflon®. Teflon® is a plastic material that supplies improved lubrication properties, resistance to wear and added strength.