Fisher™ DFA Variable Geometry Desuperheater
The Fisher DFA (Desuperheater with Flexible Architecture) incorporates both a water control element and a variable geometry, mechanically atomized, self-contained desuperheater for moderate to high flow variation. The DFA is installed through a flanged connection on the side of an NPS 8 or larger pipeline.
SpecificationsCertificationsPED, CRNCritical ServiceSteam ConditioningFlow CharacteristicsEqual percentage, Modified equal percentage, Linear, Special characterizationMaterialSA105, F22, F91Operating TemperatureHigh TemperaturePressure ClassASMEProcess Connection TypeFlangedShutoff ClassClass V (FCI 70-2)Valve SizeNPS 3, NPS 4Valve Size StandardNPSOther ConfigurationsContact your local Emerson business partner or sales office to learn about additional specifications or options for this product.FeaturesCustom designed bodies with a probe-style desuperheater, matched with multiple trim styles are able to meet almost any face-to-face, piping, or application requirements.Optimized spray 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 replace 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.
