Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications! Calculate spring operated relief valves in liquid systems.
The minimum discharge area of a spring operated relief safety valve in a liquid system can be calculated as
A = q SG 1/2 / (28.14 K bp K visc dp 1/2) (1)
A = discharge area (Square Inches)
q = relieving capacity (Gallons per Minute)
SG = of the fluid Specific Gravity
K bp = capacity correction for back pressure - 1.0 for atmospheric pressure systems
K visc = correction factor due to velocity - 1.0 for most water systems
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