Fisher™ DFA Variable Geometry Desuperheater
FISHER?DFA可變幾何減溫器FISHER DFA（具有柔性結構的減溫器）兼有水控制元件和可變幾何、機械霧化、自給式減溫器，適用于中高流量變化。DFA是通過NPS 8或更大管道側的法蘭連接安裝的。
pattern with AF nozzle technology allows for a wide operating range to achieve optimal mixing and quick vaporization at all flowing conditions.
Nozzles can be easily removed, maintained, or replaced without having to replac the entire unit.
The nozzle mount is engineered to minimize the potential for excitation due to vortex shedding and flow induced vibration.
Multiple nozzle configurations are available to provide medium to large amounts of spraywater to cool steam to the required temperature.
Uses a forged construction, optimized to move weld joints away from high stress regions.
An integral thermal liner inside the desuperheater body pipe minimizes the potential for thermal shock when cool water is introduced.
Increased wear-resistance of hardened, stainless steel trim means longer lasting service. When inspection or maintenance is necessary, the body can stay in the pipeline during removal of trim parts. Maintenance is simple and can easily be performed uRugged seat guiding and cage guiding provides increased valve plug stability, which reduces vibration and mechanical noise.
Valve trim is capable of full pressure drops and, in most cases, common with the Fisher easy-e? and HP valves which reduces trim inventory costs.
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