Modern machinery consisting of hydraulic telescopic cranes, rotating and fixed telescopic handlers, forklift trucks and construction site vehicles with different capacities and tonnages. All hoisting operations are executed by qualified and well-trained professionals with a sharp eye for details. Upon request Sarens surveys the works to be conducted on site and draws up the necessary hoisting plans.
From backyard log splitters to the huge machines you see on construction sites, hydraulic equipment is amazing in its strength and agility! On any construction site you see hydraulically operated machinery in the form of bulldozers, backhoes, shovels, loaders, fork lifts and cranes.
Hydraulics operate the control surfaces on any large airplane. You see hydraulics at car service centers lifting the cars so that mechanics can work underneath them, and many elevators are hydraulically operated using the same technique. Even the brakes in your car use hydraulics!
The cranes on the quayside were water powered. Using water in cylinders to create a force to move things is called ‘hydraulics’ and today a special oil called ‘hydraulic fluid’ is used instead of water.
All sorts of machines use hydraulics: car brakes; aeroplane wing and tail actuators; JCB diggers etc.
Hydraulic pumps supply fluid to the components in the system. Pressure in the system develops in reaction to the load. Hence, a pump rated for 5,000 psi is capable of maintaining flow against a load of 5,000 psi.
Pumps have a power density about ten times greater than an electric motor (by volume). They are powered by an electric motor or an engine, connected through gears, belts, or a flexible elastomeric coupling to reduce vibration.
Common types of hydraulic pumps to hydraulic machinery applications are;
Efficiency, operational flexibility and reliability are critical parameters for hydraulic machinery of all types. A modern water turbine design must offer very high efficiency, as the equipment is now expected to operate over an increased operating range and to cycle more frequently. Requirements are similar for pump design, as well as for vehicle torque converters and marine liquid propulsion systems, including propellers. Axial piston pump: many designed with a variable displacement mechanism, to vary output flow for automatic control of pressure. There are various axial piston pump designs, including swashplate (sometimes referred to as a valveplate pump) and checkball (sometimes referred to as a wobble plate pump). The most common is the swashplate pump. A variable-angle swashplate causes the pistons to reciprocate a greater or lesser distance per rotation, allowing output flow rate and pressure to be varied (greater displacement angle causes higher flow rate, lower pressure, and vice versa). Radial piston pump: normally used for very high pressure at small flows.