Rotary Control Valves Anti-Cavitation Valve Trim Helps Improve Plant Availability and Safety
Emerson’s Fisher Cavitrol Hex severe service valve trim reduces or eliminates cavitation to improve rotary valve performance and extend operating life.
Emerson’s Fisher Vee-Ball Rotary Control Valves are now available with Cavitrol Hex Anti-Cavitation Trim to reduce or eliminate vibration caused by cavitation. The Cavitrol Hex trim option provides improved performance in severe service applications while maintaining valve efficiency, resulting in increased safety, states the company.
Cavitation is the formation and collapse of vapour bubbles (cavities) in liquid flow streams caused by changes in pressure and velocity. There are three primary negative side-effects of uncontrolled cavitation in control valves: excessive vibration, equipment damage and deterioration of flow control.
Vibration can damage equipment and shorten operating life. When equipment deteriorates, flow cannot be controlled properly, negatively impacting plant availability, efficiency and output. Left unchecked, excessive vibration can create unsafe working conditions. The Cavitrol Hex Anti-Cavitation Trim substantially decreases vibration and reduces or eliminates cavitation to improve plant safety, adds the firm.
Cavitrol Hex trim is available on Fisher V150, V200 and V300 rotary control valves. It can be easily retrofitted into previously installed Vee-Ball valves after minimal modifications to the valve body. The trim option is available on Vee-Ball valves in sizes NPS 4 through to 12, providing high capacity for gas, steam and liquids. To meet specific application requirements, a variety of metal and soft ball seal materials are available. Cavitrol Hex trim will not affect valve shut-off or valve temperature limits and does not influence the primary ball/seal interface.
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