Brochure

has an expanding flow area design. Each of the
Cavitrol IV trim stages has a successively larger flow
area. The result is very efficient operation because
more than 90 percent of the overall pressure drop is
taken in the initial stages where there is little danger
of cavity formation. Consequently, a relatively low
inlet pressure to the final stage is achieved.
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 5-stage trim
n Angle body
n ASME Class 2500 - 4500
n NPS 2 - 10
n Flow-down design
n 552 bar (8000 psi) pressure drop limit
n ANSI/FCI Class V and VI shutoff
PRODUCTION: Coal-red power plant.
APPLICATION: Boiler feedwater recirculation service.
CHALLENGE: 538 bar (7800 psi) pressure drop water at 204°C (400°F).
SOLUTION: NPS 10 Fisher block-forged valve with 5-stage Cavitrol IV trim.
RESULTS: Withstood high pressure, prevented cavitation, and provided accurate control.
Fisher
®
Cavitation-Control Technologies | 15
CAV4 Control Valve with Cavitrol
™
IV trim
PROVEN RESULTS