Fisher
NotchFlo™ DST valve trim avoids cavitation as it controls high-pressure
flow
MARSHALLTOWN,
IOWA (August 21, 2002.) Emerson Process Management today introduced Fisher®
NotchFlo™ DST control valve trim that prevents the cavitation and
clearance-flow problems typical to 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 LLC
(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®;
Fisher®; Micro Motion®; Westinghouse Process Control; Rosemount®; DeltaV™
Intellution®; and AMS.
About
Emerson
