Fisher® Cavitrol™ IV Trim
Cavitrol™ IV trim in a Fisher® CAV4 control valve is designed specifically for liquid applications, such as boiler feedwater recirculation, where pressure drops are above 3000 psi and cavitation is a problem.
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Typical Application: |
Hydrocarbon: Platform Overboard, Sour Water Letdown, Produced Water Pump Recirculation, Produced Water Injection |
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Power: Boiler Feedwater Startup, Boiler Feedwater Pump Recirculation |
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- Cavitation Decreased—A properly sized CAV4 valve with Cavitrol IV trim decreases cavitation and its resultant damage and noise.
- Long Trim Life—Pressure-staging design and separation of shutoff and throttling locations decrease clearance-flow erosion. Hardened trim materials result in improved wear resistance.
- Tight Shutoff—Soft metal-to-metal seat provides tight shutoff without the need for periodic lapping. The anti-extrusion ring provides an enhanced valve plug seal.
- TSO (Tight Shutoff) Trim—Valves with TSO trim are factory tested to a more stringent Emerson Process ManagementTM test requirement of no leakage at time of shipment using ANSI/FCI Class V procedures.
- Efficient Operation—Expanding flow area design takes advantage of the ability of the liquid to undergo a greater pressure drop in initial stages without cavitating. This results in a much lower inlet pressure to the final stage.
- Characterization—Special characterized cages are available to provide customer specified rangeability for specific system requirements.
- Easy Maintenance—Design reduces maintenance downtime by permitting quick disassembly with easy access to valve trim and valve plug seat. Separable seat ring for low temperature applications (at or below 232°C [450°F]) makes maintenance easier.
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