Basic Valve Sizing:
Air valves are sized for flow capacity (Cv) based upon a given cylinder piston size, stroke and travel time requirements. Cv us actually a flow coefficient that measures the amount of air a device can pass. The following…
Calculating Bearing Requirements for Oil Lubricants:
V = A x T
V = volume in terms of lube-oil replacement rate in cubic inches per hour (in³/hr)
A = bearing surface area in square inches (in²) (sized differently based on bearing type)
T…
Pressure, Force and Horsepower Relationships:
Pressure (psi) = force (lbs) / area (in²)
Force (lbs) = area (in²) x pressure (psi)
Area (in²) = force (lbs) / pressure (psi)
Fluid Power Horsepower:
Fluid Power Horsepower (hp…
Volts (E):
Volts = square root of (watts x ohms)
Volts = watts / amperes
Volts = amperes x ohms
Ohms (R):
Ohms = volts / amperes
Ohms = volts² / watts
Ohms = watts / amperes²
Watts (W):
Watts = volts²…
Electrical Cost = HP x .746 x hours x Kw cost / motor efficiency
Example: 50 HP air compressor that runs 8 hours a day 5 days a week for a year with a $.06 Kw electric rate and a 90% efficient electric motor.
50 HP x .746 x 2,080 hours x $.06…