Demanding applications and problem-solving uses for industrial ball valves, gate valves, globe valves, high performance butterfly valves, knife gate valves, pneumatic actuators, electric actuators, limit switches and positioners. Courtesy of Rencor Controls - (800) 777-4174
Tuesday, September 29, 2015
What Cavitation Looks Like, and How It Effects Your Valve
Cavitation is the formation of "bubbles" caused by rapid changes in pressure. It is a significant cause of wear metallic on surfaces in process piping, valves, pumps and instruments. As the rapid change in pressure takes place, the bubbles (voids in the liquid) collapse (implode), and expose the surrounding metal surfaces are repeatedly stressed by these implosions and their subsequent shock wave.
The consequences for a control valve as well as for the entire control process vary and are often destructive and may include:
Loud noise
Strong vibrations in the affected sections of the plant
Choked flow caused by vapor formation
Change of fluid properties
Erosion of valve components
Destruction of the control valve
Plant shutdown
This video provides a visual demonstration, through clear piping and valve housing, what actually happens inside the piping system.
Here is an excellent paper by Samson Controls on cavitation and its effects on control valves.
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