Emerson's New Dirty Service Control Valve Trim Advances Performance of Fisher(R) Valves in High Pressure Liquid Applications | Automation.com

Emerson's New Dirty Service Control Valve Trim Advances Performance of Fisher(R) Valves in High Pressure Liquid Applications

Fisher NotchFlo(TM) DST valve trim avoids cavitation as it controls high-pressure flow

MARSHALLTOWN, IOWA (August 22, 2002) -- Emerson Process Management today introduced Fisher NotchFlo DST control valve trim that prevents the cavitation and clearance-flow problems typical of high-pressure liquid applications within the power generation industry, in oilfield production use, and in refinery recirculation and letdown services.

The NotchFlo DST control valve trim features a longitudinal flow path that incorporates a series of pressure staging notches. The notches achieve the required pressure drop while avoiding conditions that would cause cavitation and result in trim damage.

The pressure staging design and separation of shutoff and throttling
locations prevent high pressure drops from occurring at the trim seat when at low flow conditions. This avoids clearance flow erosion of the seat line, thereby extending the already long-term shutoff capability of the NotchFlo DST control valve trim.

As an added benefit, the relatively large flow passageway through the NotchFlo DST control valve trim design allows control of liquids with entrained solids. Flow rangeability is 50:1.

The NotchFlo DST control valve trim is pressure-balanced, which yields smoother operation and reduces actuator size requirements. The valve plug features a large-diameter stem for added rigidity against high-pressure conditions. NACE materials are available for corrosive applications.

The new NotchFlo DST control valve trim is offered in globe and angle body styles.

About Emerson Process Management
Emerson Process Management (www.emersonprocess.com), an Emerson business, is a leader in helping businesses automate their production, processing and distribution in the chemical, oil and gas, refining, pulp and paper, power, food and beverage, pharmaceutical and other industries. A division of Emerson, Fisher Controls International, Inc. (www.emersonprocess.com/Fisher)
is a global leader in the design, manufacture and application of final control systems. Fisher's technology and innovation in process control plays a key role in Emerson's combining of superior products and technology with industry-specific engineering, consulting, project management and maintenance services. Emerson brands include: PlantWeb(R); Fisher(R); Micro Motion(R); Westinghouse Process Control; Rosemount(R); DeltaV(TM); Intellution(R); and AMS.

About Emerson
St. Louis-based Emerson (www.gotoemerson.com) is a global leader in bringing technology and engineering together to provide innovative solutions to customers in process control; electronics and telecommunications; industrial automation; heating, ventilating and air conditioning; and appliance and tools. Sales in fiscal 2001 were $15.5 billion.

Fisher, NotchFlo, PlantWeb, Micro Motion, Rosemount, DeltaV , and
Intellution are marks of Emerson Process Management. Other marks are the property of their respective owners.

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