Parker Hannin Corporation
Hydraulic Pump and Power Systems Division
Marysville, Ohio USA
Bulletin HY28-2708-02/SVC/EN | July 2019
Medium Pressure Axial Piston Pumps
P1/PD B-mod Service Information
58
CONVERSION FACTORS
DEFINITION & UNIT
Displacement in
3
/rev x 16.387 = cm
3
/rev cm
3
/rev x 0.06102 = in
3
/rev
Flow 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
Conversions and Formulas