Safety Valves in Liquid Systems - Pilot Operated

Calculation formula pilot operated relief valves in liquid systems

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The minimum discharge area of pilot operated relief safety valves in liquid systems can be calculated as

A = q SG1/2 / (36.81 Kvisc dp1/2)

where

A = discharge area (Square Inches)

q = relieving capacity (Gallons per Minute)

SG = Specific Gravity

Kvisc = correction factor due to velocity - 1.0 for most water systems

dp = differential pressure - set pressure (psig) + over pressure (psig) - back pressure (psig)

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