Technical Info
Our Hydraulic Blog is the place to get hydraulic formulas, facts and important information for maintenance on motors, valves, cylinders and pumps.
Hydraulic Accumulator Formulas |
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|---|---|---|
| Formula For: | Word Formula | Letter Formula |
| Pressure or Volume w/ Constant “T” (Temperature) |
Original Pressure x Original Volume = Final Pressure x Final Volume | P1 V1 = P2 V2 Isothermic |
| Pressure or Temperature w/ Constant “V” (Volume) |
Original Pressure x Final Temperature = Final… Continue reading | |
Hydraulic Capacity & Volume Equivalents
| Cubic Inches | Cubic Feet | Cubic Yards | |
|---|---|---|---|
| CU Inches | 1. | .0005787 | .00002143 |
| CU Feet | 1,728. | 1. | .037037 |
| CU Yards | 46,656. | 27. | 1. |
| Liters | 61.0234 | .0353145 | .001308 |
| U.S. Gallons | 231. | .133681 | .004951 |
| Imp. Gallons | 277.274 | .160549 | .0059429 |
| Lbs Water | 27.6798 | .0160184 | .0005929 |
Hydraulic Capacity & Volume Equivalents
| Liters | U.S. Gallons… Continue reading |
|---|
Thermal Formulas |
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|---|---|---|
| Formula For: | Word Formula | Letter Formula |
| Reservoir Cooling Capacity Based on Adequate Air Circulation |
Heat (BTU/HR) = 2 x Temperature Difference Between Reservoir Walls And Air (ºF) x Area of Reservoir (Sq.Ft.) |
BTU/Hr = 2.0 x T x A |
| Heat in Hydraulic Oil (approx.) Due to System Inefficiency(SG=.89-.92) |
Heat (BTU/HR) = Flow Rate… Continue reading | |
Hydraulic Cylinder Formulas |
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|---|---|---|
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Cylinder Formulas For: |
Word Formula |
Letter Formula |
| Cylinder Area In Square Inches |
Area = x Radius2 (Inches) Area = x Diameter2 (Inches) |
A = r2 A = or A = .785D2 |
| Cylinder Force In Pounds, Push or Pull |
Force = Pressure (psi) x Net Area (Square Inches)… Continue reading | |
x Radius2 (Inches) 
x Diameter2 (Inches)
or A = .785D2
Hydraulic Pump Formulas |
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|---|---|---|
| Pump Formulas For: | Word Formula | Letter Formula |
| Pump Outlet Flow In Gallons/Minute |
Flow = |
Q =  |
| Pump Input Power In Horsepower Required |
Horsepower Input = |
HPIN = or  |
| Pump Efficiency Overall in Percent |
Overall Efficiency =  X 100 Overall Efficiency = Volumetric Eff. x Mechanical Eff. |
EffQV=  x… Continue reading |
Hydraulic Fluid Formulas |
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|---|---|---|
| Hydraulic Fluid Formulas For: | Word Formula | Letter Formula |
| Velocity Through Piping In Feet/Second Velocity |
Velocity = | V =  |
| Compressibility of Oil In Additional Required Oil To Reach Pressure |
Additional = Volume |
VA =  * Approximately 1/2 % per 100 psi |
| Compressibility of a Fluid | Compressibility = |
C(ß)= |
| Specific Gravity of… Continue reading | ||
Hydraulic Formula Table |
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|---|---|---|
| Formula For: | Word Formula | Letter Formula |
| Fluid Pressure In Pounds/Square Inch |
Pressure = | P =  or psi = |
| Fluid Flow Rate In Gallons/Minute |
Flow Rate = | Q =  |
| Fluid Power In Horsepower |
Horsepower = | HP =  |
All parts, with the exception of a few, are lubricated by the hydraulic oil in the circuit. Pay particular attention to keeping oil in the circuit clean. Whenever there is a hydraulic component failure (cylinder, pump, valve), and there may be metal particles in the system, the oil must be drained, the entire system flushed… Continue reading
WARNING: Before working on a telescopic cylinder mounted on a truck or trailer unit, use supports or holding devices that will absolutely prevent the body from accidentally lowering. Place control valve in the “LOWER” position to assure that all pressure has been relieved from the cylinder.
Telescopic Cylinder Maintenance List
- Packing, wipers and bushings… Continue reading
WARNING: Before working on a double acting telescopic cylinder mounted on a truck or trailer unit, use supports or holding devices that will absolutely prevent the body from accidentally lowering. Place control valve in the “LOWER” position to assure that all pressure has been relieved from the cylinder.
Double Acting Telescopic Cylinder Recommendations
- A double… Continue reading