Brochure

utilizes a multi-stage, axial flow path where fluid
flow is parallel to the axis of the plug and cage.
Pressure reduction occurs throughout the length
of the plug. Individual stages are not exposed to
the full pressure differential.
NotchFlo DST trim uses a series of flow restrictions
and expansions to control the pressure drop of the
fluid. The notched plug allows up to 12 mm (½-inch)
particulate to flow through the trim without
plugging. The amount of pressure drop per stage
is designed to prevent cavitation problems and
minimize erosion issues on a properly sized valve.
Due to the need for tight shutoff, this multi-stage
trim incorporates a protected seat design that
separates the shutoff and throttling locations.
All significant pressure drops are taken downstream
of the valve seat. As a result, the seating surfaces
are not worn away by throttling control action, so
shutoff capabilities are extended.
n 3, 4, or 6-stage trim
n ASME Class 150 - 1500 globe body
n ASME Class 150 - 2500 angle body
n NPS 1 - 8
n Flow-up design only
n 290 bar (4200 psi) pressure drop limit
n ANSI/FCI Class V shutoff
n Ability to pass 12 mm (½-inch) particulate,
depending on valve size
Fisher
®
Cavitation-Control Technologies | 13
PRODUCTION: Ethylene and propylene.
APPLICATION: Re-circulating, cavitating liquid with entrained solids at 103 bar (1500 psi).
CHALLENGE: Seat erosion, noise levels up to 120 decibels, and pipe vibration.
SOLUTION: Fisher NotchFlo DST control valve.
RESULTS: Quiet operation, long seat life, and reduced lost product and are emissions.
NotchFlo
™
DST Control Valve
PROVEN RESULTS