- July 13, 2023
- 4:26 am
- Comments
In the previous article we observed that leaks are a common situation that occur in equipment, so we must know its operation and standards, as well as hermetic exercises to prevent this from happening.
Various valves, depending on their design, require leak tests. Although there are some that are acceptable in the tests, which we point out below, according to the hermeticity Class VI parameters.
Image by EXal Technology
1 bubble equals 0.15 ml. For larger diameters, the standard does not define allowable leaks. Valid for all classes of hermeticity.
- Leakage is measured once the valve is stabilized at test pressure.
- The nominal diameter is that of the ball.
Soft seated valves can generally be required with tightness up to Class VI.
Metal/metal seated valves are generally limited to Class IV.
Metal/metal seated valves are generally limited to Class IV.
We must always take into account the variant of the valve that is required, the level of tightness or closing capacity of the plug-seat assembly that regulates the flow of fluid, whatever its design. Data that must be persistently required in the specification of any control valve, since it conditions its selection and that of other elements, such as the actuator.
Source information:
- Campos López, A. (2018). Fugas en válvulas de control. ISA.
- Información técnica de EXal. (2020). Clases de hermeticidad para válvulas, EXal Technology.
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