Parker P1 Series - Conversions and Formulas

Parker Hannin Corporation
Hydraulic Pump and
Power Systems Division
Marysville, Ohio USA
Bulletin HY28-2665-02/SVC/EN
Medium Pressure Axial Piston Pumps
P1/PD Maintenance
59
TEST PROCEDURE
PUMP WITH LOAD SENSE COMPENSATOR
STEP
REFERENCE
CONDITION REQUIRED VALUE MEASURED VALUE
1 Set the pump speed to 1800 RPM 1800 rpm
2 Record input oil temperature 43-54 ° C (110 – 130 °F)
3A
Set output load prssure to 50 ± 2 bar
(725 ± 30 psi)
n/a n/a
3B
Adjust throttle valve and adjust differential setting
until pressure at pump outlet is 20 ± 2 bar
(290 ± 30 psi) higher than the load pressure gage
n/a n/a
4
Adjust throttle valve to required ow raqte. Adjust
output load presure valve if necessary to maintain
50 ± 2 bar (725 ± 30 psi)
See performance chart
5
Increase the output pressure to 260 ± 2 bar
(3770 ±30 psi). Verify that the ow remains within
specied limits.
See performance chart
6
Lock the load sense adjustment screw. Conrm
differential pressure at 20 ± 2 bar (290 ± 30 psi).
n/a n/a
7 Verify no external leaks No leakage permitted
Conversions & Formulas
CONVERSION FACTORS
DEFINITION & UNIT
displacement in
3
/rev x 16.387 = cm
3
/rev cm
3
/rev x 0.06102 = in
3
/rev
ow gpm x 3.78 = L/min L/min x 0.2642 = gpm
power hp x 0.7457 = kW kW x 1.341 = hp
torque lb-ft x 1.3567 = Nm Nm x 0.7376 = lb-ft
pressure lbs/in
2
(psi) x 0.06895 = bar bar x 14.50 = lbs/in
2
(psi)
lbs/in
2
(psi) x 6.895 = kPa kPa x 0.1450 = lbs/in
2
(psi)
weight lb x 0.4536 = kg kg x 2.205 = lbs
force lb x 4.448 = N N x 0.2248 = lbs
volume in
3
x 16.387 = cm
3
cm
3
x 0.06102 = in
3
area in
2
x 6.452 = cm
2
cm
2
x 0.1550 = in
2
length in x 25.4 = mm mm x 0.03937 = in
temperature degree F-32 = °C 1.8 x C+32 = °F
1.8
viscosity cSt x 1.0 = mm
2
/sec mm
2
/sec x 1.0 = cSt
SSU = cSt x 4.25 + 14 20 cSt = 99 SSU
FLUID POWER FORMULAS
Pump input torque lbs. in. pressure(psi) x displacement (in
3
/rev)
2� x mech. eff.
Pump input power hp rpm x (in
3
/rev) x (psi)
395934 x overall eff.
Pump output ow U.S. gpm rpm x (in
3
/rev) x volumetric eff.
231
Fluid motor speed rpm 231 x ow rate(U.S. gpm) x volumetric eff.
displacement (in
3
/rev)
Fluid motor torque lbs. in. pressure(psi) x displacement (in
3
/rev) x mech. eff.
2�
Fluid motor power hp rpm x (in
3
/rev) x (psi) x overall eff.
395934
(metric)
Pump input torque Nm pressure(bar) x displacement (cm
3
/rev)
20� x mech. eff.
Pump input power kW rpm x (cm
3
/rev) x (bar)
600000 x overall eff.
Pump output ow Lpm rpm x (cm
3
/rev) x volumetric eff.
1000
Fluid motor speed rpm(min
-1
) (tr/mn) 1000 x ow rate (Lpm) x volumetric eff.
displacement (cm
3
/rev)
Fluid motor torque Nm pressure(bar) x displacement (cm
3
/rev) x mech. eff.
20�
Fluid motor power kW rpm x (cm
3
/rev) x (bar) x overall eff.
600000