What is a hydraulic cylinder?

A hydraulic cylinder (also known as a jack, bottle jack, press, small press, small bottle, pump or small pump) is a drive element that is used in equipment or tools to exert linear strength using a hydraulic liquid (oil). 700 bar or 10,400 Psi hydraulic cylinders, jacks or bottle jacks are used to move heavy objects. This can be done by lifting, lowering, pushing and/or pulling them.

Holmatro's hydraulic cylinders operate on the basis of high pressure hydraulics. This means that the cylinders can handle an operating pressure of 720 bar. The hydraulic pump forces hydraulic oil into the cylinder. The pressure in the cylinder increases, causing the cylinder's plunger to be pushed out.

Which return types are there?

There are four types of return that can be used to get the plunger back into the cylinder after the lifting has been done:

• Gravity return; return of plunger by means of the load or another external force.
• Spring return; return of the plunger by means of a spring integrated in the cylinder.
• Air return; return of the plunger by means of a chamber filled with compressed air (6 bar) in the cylinder.
• Hydraulic return; return of the plunger by means of hydraulic pressure. Cylinders in which the plunger hydraulically extends and returns are also called double-acting cylinders.

Which type of hydraulic cylinder?

Holmatro offers hydraulic cylinders in many variations, capacities (tonnages), stroke lengths and closed heights (building heights). The choice is enormous and it is for this reason that we provide an intelligent configurator that makes it easier to choose the right hydraulic cylinder, to expand an existing cylinder set or to put together a new set. The Holmatro Cylinder System Configurator contains our entire range, including multi purpose cylinders, aluminum cylinders, flat cylinders and short stroke cylinders.