The hydraulic seal restricts the escape of fluids or entry of foreign materials within a hydraulic application. Cylinders are one such set of applications to which hydraulic seals will be applied. The seals are specifically designed to work within high pressure dynamic situations. Hydraulic seals fulfil a vital role in the use of machinery. They are critical in paving a way for fluid power to be converted into linear motions.
The seals can be prepared for rotary and reciprocating motions. They can be single or double acting. Single acting seals will be used for one axial motion only. The double acting seals will be used in both directions to produce the reciprocating motion. The range of hydraulic and pneumatic seals include cast iron piston rings, gaskets, back up rings, buffer rings, oil and grease seals, static seals and wear rings. And there are others too.
Hydraulic seals are made from a variety of materials. These will include polyurethane, fluorocarbon rubber and nitrile. Silicone and nylon will be used as well. Then there is PTFE to which is added bronze, nickel and glass. Hydraulic seals will also be molded from the fabric of reinforced rubber or leather. The definition of seal or sealing needs to be fully appreciated. In every instance of everyday life, seals will be placed on products utilized for everyday use.
At the best of times, these seals are hardly seen. They have been designed with discretion in mind. But in the industrial space, surely there is no need for discretion. Better to be seen and heard. Be that as it may, sealing work is vital in this space when you consider that all manner of sensitive and harmful materials must flow through hydraulic operations, usually in the form of cylinders.