7
SINGLE ACTING SYSTEM WITH 2 CYLINDERS
START UP OF A SINGLE ACTING INSTALLATION
LARZEP cylinders can operate vertically upwards, downwards or horizontally.
Check the correct installation and perfect functioning of the device with a load, in accordance with the next
procedure:
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Operate the pump to move the cylinder, following its operating instructions.
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If the cylinder is equipped with a mechanical end of stroke capable of withstanding the maximum device
pressure, continue pumping until the end of stroke is reached.
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If any control elements (pressure gauges) are available, you will be able to see how the pressure
increases along with the effort required to move the lever.
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Continue pumping until you reach the maximum pressure (700 kg/cm
). When using a manual pump, in
this way you will be able to check the correct functioning of the internal safety valve and the absence of
oil leaks in the installation.
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Maintain system pressure for a few minutes without pumping, in order to check the correct functioning
of the pump’s check valve.
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Smoothly open the pump’s valve in order to protect the pressure gauge needle. In hand pumps, do not
force the drive screw when open, the cylinder will not move back more quickly if the screw is looser.
One turn is sufficient.
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If the cylinder has a spring return (SM, SMP, SMX, SH, TE, T, SAM, SAH, SATM, CY, KC) the piston will
move back automatically. The return speed may be slow in some applications. In this case, we
recommend the use of double acting cylinders. In the case of load return cylinders (SP, SPR, SX, SL, SSR,
ST, STR, STX, SAT), you will need to push the piston back using more or less force, depending on the size
and position of the cylinder.
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In cylinders without mechanical end of stroke (SSR, ST, STR, STX) this type of test cannot be carried out.
If you do not have a test bench, you will have to test the installation using the actual load in the
application. This operation should be carried out with extreme care, by experienced personnel, and
maximum safety measures should be applied.
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Repeat the processes as many times as necessary until you are comfortable handling the device.
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When using close or check valves, or working with various cylinders via flow distributors, remember to
take into consideration the effect these accessories may have on the functioning of the device, and
establish an operating procedure in order to avoid unwanted effects.