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Literature & Videos
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Case Studies
Find out creative and intuitive ways CFI provides customer solutions for increased reliability.
Featured Case Study
The customer faced lead time ranging from 18-30 weeks to order replacement valves from Rexroth in Germany. To reduce the risk of not having spare valves available when needed, the customer resorted to ordering ten valves per order to maintain a stock of available spares.
Discover More CFI Case Studies:
- Plastic Injection Molding
- Plastic Manufacturing
- Petrochemical
Fluid Power Formulas
You have a job to do and remembering every formula can be tough. Use these formulas to make your day a little easier.
Basic Fluid Power Formulas
| Variable | Word Formulas with Units | Simplified Formulas |
|---|---|---|
| Fluid Pressure – P | (PSI) = Force (Pounds) / Area (Sq. In.) | P = F / A |
| Fluid Flow Rate – Q | GPM = Flow (Gallons) / Unit Time (Minutes) | Q = V / T |
| Fluid Power in Horsepower – HP | Horsepower = Pressure (PSIG) × Flow (GPM)/ 1714 | HP = PQ / 1714 |
Pump Formulas
| Variable | Word Formulas with Units | Simplified Formulas |
|---|---|---|
| Pump Output Flow – GPM | GPM = (Speed (rpm) × disp. (cu. in.)) / 231 | GPM = (n ×d) / 231 |
| Pump Input Horsepower – HP | HP = GPM × Pressure (psi) / 1714 × Efficiency | HP = (Q ×P) / 1714 × E |
| Pump Efficiency – E | Overall Efficiency = Output HP / Input HP | EOverall = HPOut / HPIn X 100 |
| Pump Efficiency – E | Overall Efficiency = Volumetric Eff. × Mechanical Eff. | EOverall = EffVol × EffMech. |
| Pump Volumetric Efficiency – E | Volumetric Efficiency = Actual Flow Rate Output (GPM) / Theoretical Flow Rate Output (GPM) × 100 | EffVol = QAct. / QTheo.X 100 |
| Pump Mechanical Efficiency – E | Mechanical Efficiency = Theoretical Torque to Drive / Actual Torque to Drive × 100 | EffMech= TTheo / TAct. × 100 |
| Pump Displacement – CIPR | Displacement (In.3 / rev.) = Flow Rate (GPM) × 231 / Pump RPM | CIPR = GPM × 231 / RPM |
| Pump Torque – T | Torque = Horsepower × 63025 / RPM | T = 63025 × HP / RPM |
| Pump Torque – T | Torque = Pressure (PSIG) × Pump Displacement (CIPR) / 2π | T = P × CIPR / 6.28 |
Actuator Formulas
| Variable | Word Formulas with Units | Simplified Formulas |
|---|---|---|
| Cylinder Area – A | (Sq. In.) = π × Radius (inch)2 | A = π × R2 |
| Cylinder Area – A | (Sq. In.) = π × Diameter (inch)2/ 4 | A = π × D2 / 4 |
| Cylinder Force – F | (Pounds) = Pressure (psi) × Area (sq. in.) | F = P × A |
| Cylinder Speed – v | (Feet / sec.) = (231 × Flow Rate (GPM)) / (12 × 60 × Area) | V = (0.3208 × GPM) / A |
| Cylinder Volume Capacity – V | Volume = π × Radius2 × Stroke (In.) / 231 | V = π × R2 × L / 231 |
| Cylinder Flow Rate – Q | Volume = 12 × 60 × Velocity (Ft./Sec.) × Net Area (In.)2 / 231 | Q = 3.11688 × v × A |
| Fluid Motor Torque – T | Torque (in. lbs.) = Pressure (psi) × disp. (in.3 / rev.) / 6.2822 | T = P × d / 6.2822 |
| Fluid Motor Torque – T | Torque = HP × 63025 / RPM | T = HP × 63025 / n |
| Fluid Motor Torque – T | Torque = Flow Rate (GPM) × Pressure × 36.77 / RPM | T = 36.77 × Q × P / n |
