Help needed: selection of valves
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The media are steam at 0.6 MPa and cold water at 0.6 MPa, with a switch every 4 hours. J41H-16C globe valves are used; however, these valves start to fail to close properly after a short time, and there is also leakage at the packing seal around the valve stem. What kind of valve would be a better choice to solve this problem, or are there any other effective solutions?
A stop valve can be used for this operating condition; it’s best to check the quality of the valve
I think the quality of this stop valve is poor; carbon steel hard-seal stop valves can withstand temperatures up to 425 degrees.
Is it that the quality of your valves is not up to standard?
The J41H-16C globe valve should be fine; check the operating temperature range. Is it a quality issue with the valve, or is it related to operating habits?
This is the lowest possible result for procurement – you get what you pay for. High-quality globe valve J41H-16C; maximum operating temperature: 425 degrees. Your valve opens only once every 4 hours, and it doesn’t operate frequently. It also has a short usage time. There’s a 95% chance that your stop valve is more expensive than those from other brands: @; go and buy something cheaper instead: lol
It’s just 6 kilograms of water and steam; the switch is made only once every 4 hours, and the valve isn’t turned on frequently. In most cases, a normal stop valve is sufficient to meet the requirements. If the sealing isn’t proper, check whether it’s due to solid impurities such as welding slag accumulating on the sealing surface after the valve was installed but before it was thoroughly cleaned, which affects the sealing effect. Otherwise, it’s as the others mentioned: the quality of the valve is poor. :L:L
The stop valve is good enough; let’s check the quality first
This valve is fully capable of meeting the operational requirements; the issue lies in the quality of the valve. It does not close properly because this globe valve uses a flat-seal design. Either the parallelism of the sealing surfaces is inadequate or their roughness is not sufficient, or there are impurities in the fluid that damage the sealing surfaces, resulting in leaks at the packing area. Additionally, the quality of the packing may be poor, the machining precision of the packing gland may be insufficient, or the packing gland may not be tightened properly.
Cavitation causes damage to the sealing surfaces; it’s a problem with the quality of the valve – replacing it with a different brand will solve the issue