Lukas HP Cylinders - Manual (Page 9)

9
4. Device designation
5. Functions and performance
25 T HP 700
Design
Cylinder type
Cylinder variant
Total stroke
in [mm]
Cylinder variant:
HP = High pressure cylinder
Design:
(no information) = Single-stage design
T = Telescopic design
Special feature:
R = Hydraulic retraction
Special
feature
R /
5.1 Description
HP cylinders are double-acting hydraulic cylinders. Extension and retraction takes place
hydraulically. The direction of movement is controlled by pressurising the piston rod side or
the cylinder base side. Control of the pressurisation must be effected by an external control
unit (e. g. control panel) and a connected hydraulic unit (the use of a hand pump is possible
in exceptional cases).
Securing against unwanted lowering of the cylinders in the event of a hose breakage is
achieved by means of quick-stop couplings fitted to the hose. If there is any doubt as to
which coupling sleeves are fitted to your hose, please contact your authorised LUKAS dealer
or LUKAS directly before using the hose.
In addition to the quick-disconnect couplings, the HP cylinders are additionally equipped with
two connection blocks with integrated safety valve. These safety valves protect the cylinder
from damage caused by sudden load increase (e.g. something has additionally fallen onto
the part to be lifted, thus suddenly increasing the weight). If the specified maximum pressure
is exceed, the safety valves automatically open and hydraulic fluid (protected) is squirted
out.
HP cylinders in telescopic design offer long hoisting paths with a low retracted overall
height.