In any hydraulic machine system, motion is produced by the action of pressurised fluids. Although production techniques continue to evolve by becoming more efficient and streamlined, the fundamental principle behind hydraulics has remained the same essentially. In essence, hydraulic systems are a push or pull mechanism that enable the machine to perform its function. For instance heavy machinery uses hydraulic fluid to lift hefty loads and the more efficient the hydraulic system, the less effort needs to be put in to lift a given load. If a machine lifts, pushes, hauls; or in fact moves in any way the chances are that it contains some hydraulic system, but what does this actually mean?
Force and Cylinders
A piston is that part of the hydraulic system located within the cylinder it is normally gas and liquid tight. The primary function of the piston is to transfer power by ejecting fluid from or compressing fluid into a cylinder (in this context fluid means gas or liquid). The force exerted by the piston and cylinder is directly proportional to the pressure per square unit (cm or inch) exerted by a fluid acting upon it. In other words, the more pressure exerted per unit of surface area, the more the piston will move and, therefore, the more work will be done for a given load.
The diameter of the cylinder is known as its bore, and its edges are sealed such that the fluid does not pass to the other side of the piston. In any hydraulic system if pressure drops one of the first lines of inquiry is to assess wear of the piston seal. The Piston itself is attached to a rod which is held in the centre of the bore by a nut on the other side of the piston, consequently push and pull calculations must take into account the mass of the rod. The stroke of the piston system is the distance as measured by a fully extended rod.
The role of the hydraulic seal
The hydraulic seal is also known as a piston seal, and it is vital to the overall functioning of the piston / cylinder system. Industrial machines that have defective hydraulic seals do not operate as efficiently as they should and so this translates into less load lifted or work done. In the industry, this means reduced profit margins and unnecessary use of scarce resources. Any industry which uses hydraulic seals from aerospace to small scale engineering is constantly striving to improve these efficiency parameters. Perhaps the most spectacular (for the wrong reasons), demonstration of what happens when things go wrong is the 1986 challenger space shuttle disaster. The inquiry established that the most likely cause of the explosion was malfunctioning hydraulic seals due to extremely low temperatures which solidified the seals inner material, meaning it could not fulfil its core function, which is to ensure a working seal.
A hydraulic seal is designed to stop fluids travelling in undesired directions. The seal maintains a barrier between components during variable conditions of temperature and pressure. In the cylinder piston setup outlined above, the seal is an internal structure which exists between the edge of the bore and cylinder. Thus preventing the passage of fluid and allowing the right degree of pressure to build up on the right side of the piston. Hydraulic cylinders convert the pressure of a fluid into linear motion as part of the overall functionality of the machine.
http://www.birminghamseals.co.uk/index.php?webpage=hydraulicseals
Force and Cylinders
A piston is that part of the hydraulic system located within the cylinder it is normally gas and liquid tight. The primary function of the piston is to transfer power by ejecting fluid from or compressing fluid into a cylinder (in this context fluid means gas or liquid). The force exerted by the piston and cylinder is directly proportional to the pressure per square unit (cm or inch) exerted by a fluid acting upon it. In other words, the more pressure exerted per unit of surface area, the more the piston will move and, therefore, the more work will be done for a given load.
The diameter of the cylinder is known as its bore, and its edges are sealed such that the fluid does not pass to the other side of the piston. In any hydraulic system if pressure drops one of the first lines of inquiry is to assess wear of the piston seal. The Piston itself is attached to a rod which is held in the centre of the bore by a nut on the other side of the piston, consequently push and pull calculations must take into account the mass of the rod. The stroke of the piston system is the distance as measured by a fully extended rod.
The role of the hydraulic seal
The hydraulic seal is also known as a piston seal, and it is vital to the overall functioning of the piston / cylinder system. Industrial machines that have defective hydraulic seals do not operate as efficiently as they should and so this translates into less load lifted or work done. In the industry, this means reduced profit margins and unnecessary use of scarce resources. Any industry which uses hydraulic seals from aerospace to small scale engineering is constantly striving to improve these efficiency parameters. Perhaps the most spectacular (for the wrong reasons), demonstration of what happens when things go wrong is the 1986 challenger space shuttle disaster. The inquiry established that the most likely cause of the explosion was malfunctioning hydraulic seals due to extremely low temperatures which solidified the seals inner material, meaning it could not fulfil its core function, which is to ensure a working seal.
A hydraulic seal is designed to stop fluids travelling in undesired directions. The seal maintains a barrier between components during variable conditions of temperature and pressure. In the cylinder piston setup outlined above, the seal is an internal structure which exists between the edge of the bore and cylinder. Thus preventing the passage of fluid and allowing the right degree of pressure to build up on the right side of the piston. Hydraulic cylinders convert the pressure of a fluid into linear motion as part of the overall functionality of the machine.
http://www.birminghamseals.co.uk/index.php?webpage=hydraulicseals