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Pilot Ratio Calculator

  • Air Pilot
  • PSI bar
  • PSI bar
  • =(Y*1.1)/(X*.9)
    Round up to standard available pilot ratio.
Air Pilot Ratio Calculator
  • Hydraulic Pilot
  • PSI bar
  • PSI bar
  • =(Y*1.1)/((X*.9)-100 PSI (6.9 BAR))
    Round up to standard available pilot ratio.
Hydraulic Pilot Ratio Calculator

Frequently Asked Questions

How do I know how much pilot pressure is required to shift a valve?

To calculate the correct pilot ratio valve, use the following equations. These equations take into consideration the spring forces in the valve; however, this is under ideal conditions, they do not consider any effects of temperature of the oil or any backpressure in the system.

Air Pilot Valve:

  1. Determine MINIMUM possible pilot pressure. Multiply available pilot pressure by .9 = PILOT (X)
  2. Determine the MAXIMUM possible system pressure. Multiply system pressure by 1.1 = SYSTEM (Y)
  3. Divide SYSTEM (Y) by PILOT (X) = PILOT TO SYSTEM RATIO
    (Y*1.1)/(X*.9) = AIR PILOT RATIO
  4. Round up to standard available ratio

Hydraulic Pilot Valve:

  1. Determine MINIMUM possible pilot pressure. Multiply the pilot pressure by .9 then subtract 100 PSI = PILOT (X)
  2. Determine the MAXIMUM possible system pressure. Multiply system pressure by 1.1 = SYSTEM (Y)
  3. Divide SYSTEM (Y) by PILOT (X) = PILOT TO SYSTEM RATIO
    (Y*1.1)/((X*.9)-100 PSI (6.9 BAR)) = HYDRAULIC PILOT RATIO
  4. Round up to standard available ratio