Questions regarding the standards for explosion-proof plugs of pressure gauges
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We currently have a pressure gauge that was manufactured by a domestic supplier through OEM production. Initially, we simply provided them with samples of foreign-made pressure gauges and asked them to replicate them. However, it has been found that there are two main problems with these gauges: one is that they don’t return to zero, and the other is oil leakage. Regarding the issue of not returning to zero, the supplier says that defective units need to be sent back for analysis. As for oil leakage, they believe there are two unreasonable aspects in our design: first, two of the pressure gauges in our equipment have the filling port at the bottom; second, we use an explosion-proof plug design. In foreign designs, the explosion-proof plug contains a diaphragm with small holes in the outer cover, but after OEM production in China, it is simply blocked with a harder plug without any holes. Oil leakage mainly occurs at the explosion-proof plug. The supplier now suggests that we remove this explosion-proof plug. I would like to find relevant standards to determine whether this can be done, but I haven’t been able to locate any such standards. The standard JB/T6804-2006 for shock-resistant pressure gauges does not specify any requirements regarding explosion-proof plugs. I wonder if anyone here is familiar with this design and can advise us on whether we can remove it. Thank you. PS: The range of our pressure gauges is 16 bar. If the pressure exceeds 30 bar, the sealing strips in our equipment will be squeezed out, causing leaks.
What pressure gauge? Show it to me, my ID is Q568099860
Even if I knew, I wouldn’t tell you. You pay for the information, and then I’ll tell you. :P.
Below is the picture of the pressure gauge from my question; it can be seen that there is a soft diaphragm present in the pressure gauge after the explosion-proof plug is removed.
I’ve solved my problem; let’s treat you to crayfish: lol
How can you tell? Do you have any good manufacturers to recommend?
Pig Brother doesn’t eat crayfish; Pig Brother wants to eat giant whales. :P, follow that picture – it’s not possible to see the details clearly. Oil leakage is a common issue with pressure gauges; it’s not an isolated case. I remember several fellow sailors mentioning that the oil leakage made the dials so dirty that they couldn’t be seen clearly. You need to take very clear photos of both the domestic and imported watches, especially of the plug part. I can see it clearly now. Many hands make light work. The stones from other mountains can be used to polish jade. Only then is it possible for someone to appear who can help you. Sealing the oil to prevent any leakage is, in a way, a small masterpiece in the art of manufacturing oil-filled pressure gauges. :Lol, the manufacturing process is just one layer of paper. In case no one can help you, you can still analyze the table by yourself. Take it apart and give it a try, try again and again; try it for 2 years or something – maybe then you’ll grow into a big plant! Good luck to you. Wish you success.
Also, I assume the explosion-proof plug you mentioned is designed to prevent the pressure-sensitive elastic element from breaking, so that process media doesn’t flow into the dial and cause the dial glass to burst and injure people, right? . . . I want to import explosion-proof plugs for valves, which rupture when the pressure exceeds a certain level, allowing the fluid to flow out and relieve the pressure. . .