The main reason for the erosion of the valve sealing surface is cavitation. Cavitation is the decrease in pressure when the liquid flows at high speed, and the bubbles escape when the pressure is as low as the vaporization pressure of the liquid. When the flow rate slows down, the liquid pressure increases, causing the bubble to burst. When the bubble bursts, a great destructive force is generated, which will cause damage to the valve port and cause internal leakage. Therefore, try to reduce the flow velocity at the sealing surface to avoid the problem of valve cavitation.

Power plant drain control valve description
•Drain valve used for main steam piping and reheater steam
•Medium: Saturated water, e.g. Main steam drain valve, Auxiliary steam drain valve
•Forged steel body: F11, F22, F91, F92, WC6,WC9, 12Cr1MoV
•Configuration: straight through
•Connections: welded, or flanges
•Cavitation free design, shut off tightly for many years
•Compact valve body, easy installation
•Throttling stages: 2, unbalanced trim
•Leakage Class: ANSI V
•Size: DN15-DN100
•Pressure: 25Mpa-42Mpa,Class 1500-Class 2500