po = pv
Using the "Steam Table" with saturated steam properties we can conclude that
Note! Flashing is not the same as cavitation. Due to local conditions in a valve cavitation may start on much higher outlet pressures.
Cavitation can be avoided by using more than one control valve or more convenient - a multistage control valve.
As illustrated above the "vena contracta" is much lower in a single stage valve than in a multi stage valve. Depending on the pressure drop and the temperature of the fluid its possible to avoid cavitation conditions using more than one stage in a valve.
Control Valve terminology, bodies, trim, flow characteristics, Cv and Kv sizing, noise, actuators and positioners
Temperature and pressure ratings for valves according API 6D.
Pressure and temperature ratings for cast carbon steel valves.
Flow coefficients - Cv - for typical ball valves - reduced and full bore.
Cavitation occurs in fluid flow systems where the local static pressures are below the fluids vapor pressure.
An introduction and definition of the Cavitation Number.
Critical pressure ratios for water and other liquids.
Saturated Steam Table with properties like boiling point, specific volume, density, specific enthalpy, specific heat and latent heat of vaporization.
Designing steam control valves and their Kv values.
Flow coefficients - Cv - and flow factors - Kv - for straight through diaphragm valves.
The valve authority expresses the ratio between pressure drop across the control valve compared to total pressure drop across the whole system.
Categories of valves.
Operating temperatures for typical categories of valves - ball valves, butterfly valves and more.
Types of valves and their typical operating sizes.
Typical flow coefficients - Cv - and flow factors - Kv - for weir diaphragm valves.
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