The characteristics of flash damage is subject to erosion surface smooth polished appearance. Again, the flash occurs because P2 < Pv. P2 is downstream of the valve pressure, is a function of the downstream process and pipeline. PV is a function of fluid and the working temperature. Therefore, the definition of flash variables is not directly controlled by valve. This further means that, for any valves fail to prevent flash. Flash can not rely on the valve to avoid, the best way is to choose the appropriate geometry and material of the valve to prevent or minimize the damage.
In short, erosion can be minimized by the following methods:
To prevent or reduce particle (here refers to the droplet ) impulse valve surface
These surface as possible hardening
Reduce the erosion velocity of the fluid flow direction change as little as possible selection of the valve can make the particles impact the number reduced to a minimum. Straight stroke angle valve is the traditional solution provides the channel. Some rotary valve, such as the eccentricity of the rotating ball valve and V valve also provides a straight channel. In the regulation of the downstream with extended flow region of the valve is also helpful, because the velocity decreases.
For those fluid will certainly impact the valve surface area, such as valve seat surface, choose as far as possible hard materials. Generally speaking, the material is hard, it can resist the erosion.
Both flash and corrosive liquid is particularly troublesome. Steel valves in the flash water is a joint action of corrosion and erosion. The water will cause corrosion of steels, and the flash will cause soft oxide layer caused by the corruption of the scour; this kind of comprehensive function rather than the two separate damage mechanism is greater. In this case, the solution is to select at least one low-alloy steel to prevent corrosion.
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