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The measurements in the test bench allow establishing the CV of these valves for various opening percentages.
It was necessary to go through the CV equation for compressible fluids, to proceed with the flow sensor selection. This test bench is used to verify the calibration of valves with continually variable opening or after repaired.
This test bench was conceived in order to determine experimentally the flow coefficient [CV] for process control valves, operating with compressible fluids, under established regulations by the standards ANSI/ISA
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This equation was obtained under similarity conditions by the equality of numbers between prototype and model (test specimen). This facility is composed machine and electronic instrumentation for measuring flow, temperature and pressure difference.
The flow capacity coefficient CV was determined experimentally by taking flow rate, pressure difference and temperature measurements. The valves that can be characterized with this test bench include: the on-off and the continually variable.
For the last ones, a finite number of tests must be done with different openings, in order to graph the characteristic curve of the control process valve.
It is necessary the supply of compressed air at 600 kPa [87 psi], and 100W of electrical power. The electronic circuit with the graphical environment running under MS Windows can be installed in any PC.
With this test bench we can characterize a new control valve in order to detect failures or malfunction of a control valve of the same type.
With this test bench we can characterize a new control valve in order to detect failures or malfunction of a control valve of the same type.
Can anyone please share design calculations for various components of hydralic test rig to find cv of valve
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