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Products

Our products provide you with the power you need.

No matter if single- or double-acting, off-the-shelf or custom made - our product portfolio of hydraulic cylinders will satisfy your power requirements for all use cases imaginable.

Double-Action Cylinders (Stainless)

Edelstahl Hydraulikzylinder doppelt

Single-Action Hydraulic Cylinders

Edelstahl Hydraulikzylinder einfach w

Custom-made Cylinders

konzentrierter Sachbearbeiter am Arbeitsplatz
  • Position measurement systems
  • Ceramic coatings
  • hydraulic manifolds for cartridge valves
  • individual requirements

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Cylinders Ready-To-Deliver

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  • Double-acting cylinder - piston 32mm / rod 20mm diameter
  • Double-acting cylinder - piston 40mm / rod 25mm diameter
  • Double-acting cylinder - piston 50mm / rod 30mm diameter
  • Double-acting cylinder - piston 63mm / rod 40mm diameter
  • Double-acting cylinder - piston 80mm / rod 50mm diameter
  • Double-acting cylinder - piston 100mm/ rod 55mm diameter

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Cylinder Designs

To provide you with an overview of the many possible applications, the following table displays the function and design of hydraulic cylinder designs.

Plunger Cylinder

Plunger Cylinder

This single-action cylinder is pressurized only in one direction and returns through its own weight. Plunger cylinders are also available with an upper limit stop.

Application: Pressen, Baumaschinen, Schwer­fahrzeugbau

einfach_wirkender_zylinder

Single-Action Cylinder

According to pressurization of the piston area, this cylinder may be either a pressure or a traction cylinder. The unpressurized piston side has an air filter to prevent dust from penetrating into the cylinder, reducing wear. If a spring has been provided as reset force, the spring pretension must be determined.

einfach_wirkender_teleskopzylinder

Single-Acting Telescopic Cylinder

Telescopic cylinders are adapted to limited installation space and, at the same time, fulfill the requirement for the longest stroke possible. All stages of the cylinder are pressurized on one side and the cylinder releases its power during extension. The cylinder retracts through its own weight.

Application: Fahrzeug-, Bagger- und Maschinenbau usw.

doppelt_wirkender_zylinder

Double-Action Cylinder (Differential Cylinder)

These cylinders are the most commonly used hydraulic cylinders. They can be manufactured with damping on the piston or rod side or on both sides.

In the case of this model, a force can be transmitted in both directions of movement. They are called differential cylinders because the piston area and the piston rod area differ and thus the cylinder extends slowly and retracts comparatively quickly at a constant feed flow.

doppelt_wirkender_teleskopzylinder

Double-Action Telescopic Cylinder

This telescopic cylinder can act in both directions.

Application: Feed mechanism for large furnaces and brick kilns

Hydraulic Cylinder Dimensions

When you select a hydraulic cylinder, the determination of the amount of operating pressure is vitally important. Together with the forces and the stroke speeds required for the task, the operating pressure determines the cylinder sizes and thus the costs.

Force and Movement Ratios of a Double-Action Cylinder

If an external force F acts on a piston, this force creates a pressure on the piston area Ak. Conversely, this force is also a resistance that the pump delivery Q meets. In this way, a pressure builds that acts evenly on all sides, including the piston area Ak. The piston can thus now exert a force itself according to the following formula:

F = p * Ak

F = p * Ar (analogously for the return)

F=Piston Forcein [N]
Ak=Piston area

(D² *3,14)


4

in [mm²]
Ar=Piston ring area

(D²-d²) * 3,14


4

in [mm²]
D=Piston diameterin [mm]
d=Rod diameterin [mm]
h=Travel lengthin [mm]
Q=Feed flowin [l/min]
t=Travel timein [s]
v=Travel speedin [m/s]

Piston Speeds

The feed flow or return flow speeds are calculated using the flows of liquid coming from the pump, which fill the stroke volume of the hydraulic cylinder within a certain unit of time.

For the speeds specified above, the following equations result under consideration of the usual units:

v=

Q


Ak

Extension
v=

Q


Ar

Retraction

Please observe that the volume of liquid flowing away during the return flow is always greater than the inflowing liquid due to the difference in area. As a result, the return flow is faster than the feed flow. If the length of the cylinder stroke is known, the stroke time t can be calculated as follows.

t=

Ak * h


Q

Extension
t=

Ar * h


Q

Retraction

Buckling Strength of the Piston Rods

The danger of the piston rods buckling during long strokes and an additional unfavorable cylinder mounting determine the cylinder sizes and their limits.

The calculations are usually carried out according to Euler since the piston rods are to be seen as slender rods.

The following applies:

Fk=

3,14² * E * I


Lk²

FK=Force at which the piston rod bucklesin [N]
E=Modulus of elasticity (Steel 210.000 N/mm²)in [N/mm2]
I=Moment of inertia (for circle cross-section)in [mm4]
LK=Free buckling lengthin [mm4]

The following diagram shows the four so-called Eulerian load cases. The permissible stroke lengths of every hydraulic cylinder series are listed in the appendix.

End Position Damping

In the case of end position damping, the kinetic energy is converted to heat energy. At a constant delay, the following applies:

m


2

= A * p * s (conservation of energy)
m=moving mass(kg)
v=Travel speed[m/s]
A=Effective damping area[m²]
p=Average damping pressure

N


s=Damping distance[m]

Permissible Stroke and Total Length Tolerances According to DIN 7169 g

L + Stroke = Installation Length in mmPermissible Deviation in mm
0…499+/-1,5
500…1249+/- 2
1250…3149+/- 3
3150…8000+/- 5
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Cylinders Ready-To-Deliver

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