Steam leakage at the metal packing of the turbine control valve stem
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Hello, everyone! The turbine throttle valve has a service life of one month; after that, steam begins to leak from between the valve stem and the metal packing. 1. This speed control valve is driven by a speed regulator. 2. The packing is a metal packing; its material is unknown, it is very hard, and it does not wear out. The valve stem is made of 2Cr13, and it experiences wear after one month of operation.
1. In the valve documentation, there is a list of wear parts; this list usually includes information such as the name, model specifications, material, and quantity. 2. Contact the manufacturer to confirm
1. Bellows valves can be used. 2. Choose manufacturers that specialize in high-temperature valves; generally, the valve cover in such valves is slightly taller than that of ordinary valves, which enhances sealing performance
The packing is usually a graphite seal ring; it seems that it wasn’t installed properly. 1. It’s possible that the packing wasn’t installed correctly, 2. It’s also possible that the heights of the spring brackets on both sides of the control valve stem are not equal.
The packing is usually a graphite seal ring; it seems that it wasn’t installed properly. 1. It’s possible that the packing wasn’t installed correctly, 2. It’s also possible that the heights of the spring brackets on both sides of the control valve stem are not equal.
For large steam turbines, our control valve packing is made of molded graphite packers; first, throttling is achieved through the throttle sleeve, and then high-pressure packing and low-pressure packing are used.
The leakage happening so quickly is probably because it wasn’t tightened properly or there’s an issue with the filler material
Regarding the packing, you should ask the manufacturer; you can either replace it or tighten the packing gland. As for wear on the valve stem, I think it’s because the hole in the valve stem was designed to be too small. In high-temperature valves, there is a temperature difference between the inside and outside, which causes thermal expansion and contraction in that area, resulting in the hole shrinking and the valve stem getting stuck. In such cases, there’s nothing that can be done. . .
First of all, thank you all! It was discovered by accident that the vibration was caused by sticking of the throttle valve stem, which led to wear of the stem and leakage of the medium. Here’s a tip: spraying a bolt loosener regularly can solve this problem; P