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Valve flash of common problems
In liquid operations, when the downstream pressure is equal to or lower than the steam pressure, vapor bubbles are generated at the converging section and remain undamaged and un-squeezed. Because the pressure recovery is high enough to produce such a situation. As shown in Figure 1, this phenomenon is called flashing. When flashed, the downstream fluid is a mixture of vapor and liquid and moves at very high flow rates, resulting in wear in the valve and downstream lines. Unfortunately, total elimination of flash involves improving the system itself, especially downstream pressure and vapor pressure. However, not all systems are easy to improve and these may not be an option. Consider the location of the valve, especially if the valve discharges the downstream stream into a large container, such as a tank or condenser. Placing the valve close to the container will cause the stream to crash into a larger volume of the container and away from any major surface. There is no solution in the design of the valve, such as the commonly used anti-cavitation or cavitation-control spools, when flash occurs and the use of hardened plug material is eliminated. More Keywords Search: Valve