Let’s take a look at what the reason is
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This valve is a sleeve valve, and its valve body is made of SCPH2. The damaged part is the valve seat! Please help analyze it! The medium is steam, with a temperature of 258 degrees Celsius and a density of 5.412 KG/M*3. Pressure before the valve: 2.0 MPA(G); pressure after the valve: 1.3 MPA(G). Closing pressure difference: 2.0 MPA(G). Maximum flow rate: 1260 KG/M*3; normal flow rate: 755 KG/M*3; minimum flow rate: 348 KG/M*3. Noise level: less than 85 decibels
From what the poster said, it seems to refer to a control valve. The main reason for the damage to steam control valves is abrasion. Based on the parameters, the operating conditions of these valves are not particularly harsh. Therefore, I believe the most likely cause is an incorrect selection of the valve, which results in it operating at a low opening degree. This leads to high flow speeds in the gap between the valve core and the seat, and the liquefaction of some of the steam causes severe erosion and wear on the seat, ultimately leading to its damage. The original poster might as well share the parameters of the control valve so that everyone can discuss them.
I’m not sure what material the seat of the control valve you are using is made of. The seats of control valves used for steam often suffer from severe erosion, especially when the steam contains water. On one hand, it is necessary to take measures to prevent steam from condensing and carrying water; on the other hand, a valve seat material resistant to erosion should be chosen.