Variable displacement pumps - Total Hydraulics BV
Variable displacement pumps - Total Hydraulics BV
Variable displacement pumps - Total Hydraulics BV
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Performances<br />
TXV series <strong>pumps</strong><br />
■■Absorbed torque at maximum <strong>displacement</strong><br />
90<br />
80<br />
70<br />
60<br />
50<br />
40<br />
m.daN<br />
150<br />
130<br />
120<br />
92<br />
75<br />
■■Calculating power as a function of torque<br />
C = (kW)<br />
ω<br />
ω = πN<br />
30<br />
x 100 = m.daN<br />
(kW) = ∆P x Q<br />
600<br />
where:<br />
= theoretical hydraulic power<br />
C = torque<br />
N = speed in rpm<br />
P = working pressure in bar<br />
Q = flow in l/minute<br />
30<br />
20<br />
10<br />
0<br />
0<br />
50<br />
100<br />
200<br />
40<br />
60<br />
300 360<br />
bar<br />
Graph of flow as a function of speed, <strong>displacement</strong> and inlet pressure.<br />
These graphs are the results of tests carried out by the HYDRO<br />
LEDUC Research Laboratory, on a specific test bench, with ISO 46<br />
fluid at 25°C (100 cSt), a 50 mm diameter supply line 1.5 m long,<br />
and a tank with oil level at the same height as the pump.<br />
■■Ideal installation<br />
Tank above the pump<br />
■■Flow<br />
Q (l/min.)<br />
300<br />
150<br />
130<br />
250<br />
130*<br />
120<br />
5<br />
200<br />
92<br />
150<br />
75 60<br />
40<br />
100<br />
50<br />
0<br />
1000<br />
*TXV pump with through shaft.<br />
2000 3000 3600<br />
N (rpm)<br />
■■Volumetric efficiency<br />
Efficiency at 1,500 rpm<br />
%<br />
100<br />
90<br />
0<br />
100<br />
200<br />
300 360<br />
bar
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