Was the sealing rating specified when ordering the control valve?
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Generally, when ordering control valves, the sealing grade isn’t mentioned. If it is mentioned, how is that determined? I think that, as long as the requirements are met, it’s better to choose a lower sealing grade, as higher grades can lead to sticking (of course, this depends on the medium used). Is that how people make their choices?
The sealing grade is essential when placing an order, and it is determined based on the process requirements. Of course, when it is possible to meet the process requirements, a lower sealing grade is preferable, as the price is also lower.
The sealing class requirement for control valves is determined based on process requirements. It is generally grade IV. If the valve is also involved in the interlock shutdown function, a higher sealing grade may be required. If the level is too low, the adjustment performance will also be affected.
The sealing class requirement for control valves is determined based on process requirements. It is generally grade IV. If the valve is also involved in the interlock shutdown function, a higher sealing grade may be required. If the level is too low, the adjustment performance will also be affected.
The leakage rate classification for regular control valves is generally Grade III or IV, while cut-off valves are usually Grade VI.
The valve ordering data sheet must specify the requirements regarding leakage; the final decision is made based on process requirements and cost-effectiveness