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## formula

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…