Enerpac & Enerpac Hydraulics

Hydraulic systems offer a highly effective way to lift and manoeuvre heavy objects

. Simple hydraulic systems have a basic design of two pistons connected by an oil filled pipe. When you apply a downward force to one piston then this is transmitted across to the second piston via the oil in the pipe. The clever part is that oil is incompressible. This means that almost all of the force applied to the first piston will be carried through to the second piston. This can also be applied to more complex systems with a master cylinder driving multiple slave cylinders if required. The hydraulic system is a very efficient way to move forces from one destination to another.

Hydraulic Theory

Hydraulic systems are based on 'Pascal's Law'. This theory states that when pressure is applied to a confined liquid (in this case oil) it is 'transmitted undiminished in all directions'. This means that you can connect more than one hydraulic cylinder to the system and still achieve the same transmission of force. According to Pascal's Law cylinders that have the lightest load will move first on the hydraulic system and those with the heaviest load last. This means that in order to ensure that all loads are lifted at the same time on a hydraulic system you need balancing control valves or Synchronous Lift System components.

Hydraulic System Components

A basic hydraulic system can include the following components:

Cylinder - this part applies the hydraulic force

Cylinder base plate - this offers additional stability for the cylinder for lifting applications

Pump - this provides the flow movement

Hose - this transmits the hydraulic flow

Male and Female Couplers - connects the hose to the hydraulic system

Gauge - this monitors pressure in the hydraulic circuit and alerts users to problems

Swivel Connector - this allows the valves and gauges to be aligned correctly.

Directional Control Valve - controls the directional flow of hydraulic fluid

Safety Holding Valve - this assists with the safe control of load in lifting applications

Manifold - distributes hydraulic fluid from master cylinder to multiple slave cylinders.

Hydraulic Applications

Hydraulic systems have many applications in commerce and industry. These systems offer a safe and efficient way to lift and move heavy or awkward objects. They can be included into machines or operated by hand.

Top applications include:

Construction - hydraulic systems are widely used in the construction industry. They provide power to lifting apparatus such as cherry pickers and cranes and also load movers such as diggers.

Factories and Warehouses - hydraulics are used in to stack, move, load and offload goods. Forklift trucks use hydraulics for stable lifting and loading and delivery trucks typically have in-built hydraulic powered loading platforms.

by: Gareth Hoyle

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