Reasons for the wear of the trapezoidal thread on the valve stem of a globe valve
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As shown in the figure, the trapezoid has worn down into a triangle, with wear on the outer side. Reason for solving
1. It starts up frequently; there are issues with lubrication – management needs to be strengthened； 2. The material has issues; it’s from a small manufacturer – switch to another manufacturer!
1. The material of your valve stem is incorrect; it hasn’t been quenched and tempered. 2. The valve stem nut isn’t made of copper – it should be made of cast iron. If it were made of copper, then it would be the valve stem nut that wears out. 3. This is the result of constantly pushing for lower prices and seeking cheap options; the manufacturers’ profit margins are squeezed to zero. As a result, they have to cut corners when it comes to the material used, otherwise their costs will be too high and they will suffer losses
The issue lies with the material of the valve stem; its insufficient strength and hardness lead to severe wear.
There is a problem with the material, and the copper sleeve is also problematic.
Thank you! Where copper sleeves are used inside, they have used stainless steel instead
Can it be seen with the naked eye that it hasn’t been quenched and tempered?:o
It’s impossible to tell with the naked eye at first, but after using it for a while, it becomes obvious just like how you can see it now