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Experience coupled with testing have shown the use of 4 diametrically opposed ports can provide the highest wear resistance in a ‘cage’ type flow trim.
The use of 4 small ports in the lower section of the cage provides fine control at low openings while the 4 larger ports provide capacity for higher flows.
4 Port flow geometry provides a balanced flow pattern which when coupled with the enlarged body gallery of these chokes will maximize lifetime and return on investment
Flow is directed through ports in the flow cage and accelerates into the centre of the trim where it impinges on flow from the opposite port.
Flow rate is adjusted by the use of a plug moving inside the flow cage ‘Plug and Cage’ or by use of a sleeve on the outside of the flow cage ‘External Sleeve’ Plug and Cage type trims provide a robust design with maximum flow capacity often used in oil production and injection service.
External sleeve type trims provide an optimized resistance to erosion and are often used for high erosive service and high pressure gas production.
Special trims such as this ED “Energy Dissipating” disk stack can be provided as solutions to severe service including anticavitation, high pressure drop and low noise service.