Hydraulic seals tend to compose of relatively soft (as compared to gaskets and rubber o rings), non-metallic materials. If a hydraulic seal fails then the hydraulic (liquid) fluid or pneumatic (gaseous) fluid will lose its ability to convert the pressure it exerts into motion or work. In other words, the hydraulic system will fail. The actual composition and characteristics of the hydraulic seal in a given system will be governed by the operating conditions and the application of the entire machine system. Depending on the industry different individual types of hydraulic seals can be found across industry, for example:
Textile Manufacturers:
Where the UK is concerned this industry has been in terminal decline for several decades, some would say even longer. Overall, pneumatic, hydraulic systems are utilised on textile machines. The reason is simple: the necessary forces that make the machines function effectively can only be obtained by constant rotation and movement of gases within tightly confined spaces. Under such conditions, the pneumatic seal must perform to the highest possible standards.
Industrial Printers: Even in the age of online and desktop publishing the printed written word is along way from being consigned to history. The publishing industry is recognised as being a highly demanding and fast paced industry. Therefore, it unsurprising that the hydraulic seals are made of materials which can stand vibrational and mechanical stress, such as high-performance synthetic (oil and rubber based) polymers. The printing presses and specialist packing machines employ a combination of pneumatic and hydraulic seals depending on the application. Industrial Machines:
Clearly, this falls under the remit of the construction industry and includes vehicles as diverse as bulldozers, cranes and excavators. These applications require exceptionally durable hydraulic seals. The seal has to cope with the rapid movement of fluids, often under high pressure, which induces excess heat and mechanical stress on the hydraulic system. The construction industry often has exacting standards as per the quality of hydraulic seals it utilises. As a corollary, agricultural machines such as combine harvesters are also required to employ equivalently durable hydraulic seals to maintain productivity and efficiency, particularly at times of extra demand such as harvest and sowing seasons. In such applications materials which facilitate lubrication (and so reduce friction) without compromising on strength are preferred. In the same context, vehicle manufacturers employ equivalent standards of quality, except that the rules are almost entirely applied to pneumatic systems.
Pumping and mining equipment:
In terms of the demand expected of them, these hydraulic seals would not be out of place if filed under industrial machinery. However, the seals used here need to accommodate materials such as liquid cement or concrete or fresh air to deep mine shafts. If these hydraulic seals fail, entire systems can collapse and cease to function. So extra attention must be paid to the properties and characteristics of the seal, the parts they are mounted in and the task it is expected to fulfil. In mining, there is clear delimitation between hydraulic systems used below ground and the pneumatic systems that tend to be used above ground.
This is a very brief snapshot of where hydraulic seals are employed in large scale applications. The point, however, is to assert that different seals are more suited to different industries, and this point is equally true for small-scale applications.
http://www.birminghamseals.co.uk/index.php?webpage=hydraulicseals
Textile Manufacturers:
Where the UK is concerned this industry has been in terminal decline for several decades, some would say even longer. Overall, pneumatic, hydraulic systems are utilised on textile machines. The reason is simple: the necessary forces that make the machines function effectively can only be obtained by constant rotation and movement of gases within tightly confined spaces. Under such conditions, the pneumatic seal must perform to the highest possible standards.
Industrial Printers: Even in the age of online and desktop publishing the printed written word is along way from being consigned to history. The publishing industry is recognised as being a highly demanding and fast paced industry. Therefore, it unsurprising that the hydraulic seals are made of materials which can stand vibrational and mechanical stress, such as high-performance synthetic (oil and rubber based) polymers. The printing presses and specialist packing machines employ a combination of pneumatic and hydraulic seals depending on the application. Industrial Machines:
Clearly, this falls under the remit of the construction industry and includes vehicles as diverse as bulldozers, cranes and excavators. These applications require exceptionally durable hydraulic seals. The seal has to cope with the rapid movement of fluids, often under high pressure, which induces excess heat and mechanical stress on the hydraulic system. The construction industry often has exacting standards as per the quality of hydraulic seals it utilises. As a corollary, agricultural machines such as combine harvesters are also required to employ equivalently durable hydraulic seals to maintain productivity and efficiency, particularly at times of extra demand such as harvest and sowing seasons. In such applications materials which facilitate lubrication (and so reduce friction) without compromising on strength are preferred. In the same context, vehicle manufacturers employ equivalent standards of quality, except that the rules are almost entirely applied to pneumatic systems.
Pumping and mining equipment:
In terms of the demand expected of them, these hydraulic seals would not be out of place if filed under industrial machinery. However, the seals used here need to accommodate materials such as liquid cement or concrete or fresh air to deep mine shafts. If these hydraulic seals fail, entire systems can collapse and cease to function. So extra attention must be paid to the properties and characteristics of the seal, the parts they are mounted in and the task it is expected to fulfil. In mining, there is clear delimitation between hydraulic systems used below ground and the pneumatic systems that tend to be used above ground.
This is a very brief snapshot of where hydraulic seals are employed in large scale applications. The point, however, is to assert that different seals are more suited to different industries, and this point is equally true for small-scale applications.
http://www.birminghamseals.co.uk/index.php?webpage=hydraulicseals