9 - AHP Merkle GmbH

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Tip
Especially for pushing loads, in addition to the dimensioning of
the hydraulic cylinder it is also necessary to calculate the buckling
strength of the piston rod.
For easy calculation of hydraulic cylinders you can use the cylinder calculator
available on the Internet at www.ahp.de, which will recommend to you the
suitable cylinder for your application.
Piston speed from fl ow rate / pump capacity
v: piston speed [m/s]
Q: fl ow rate [l/min]
A: piston surface [mm2 ]
P: required pump capacity [KW]
p: system pressure [bar]
η: effi ciency of the hydraulic system
v =
v =
P =
Required oil quantity / fl ow rate
Q: fl ow rate [l/min]
A: piston surface [mm2 ]
v: piston speed [m/s]
η: effi ciency of the hydraulic cylinder
Q = A • 0.06 • v
Q =
Q
A • 0.06
P • η • 10 4
A • p
Q • p
600 • η
P • 600 • η
p
Recommended fl ow speeds
Suction lines: ≤ 1.5 m/s (4.92 feet/s)
Return lines: ≤ 3 m/s (9.84 feet/s)
Basic information about hydraulic cylinders en
Pressure lines: ≤ 25 bar (362.5 PSI) ≤ 3 m/s (3.28 feet/s)
25 to 63 bar (362.5 to 913.5 PSI) 3 – 5 m/s (10.76 to 16.40 feet/s)
63 to 160 bar (913.5 to 2320 PSI) 4 – 6 m/s (13.12 to 19.68 feet/s)
160 to 250 bar (2320 to 3625 PSI) 5 – 8 m/s (16.40 to 26.24 feet/s)
> 250 bar (3625 PSI) ≤ 10 m/s (32.8 feet/s)
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