Dirty Service Anti-Cavitation
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Dirty Service Trim (DST) is a patented multi-stage, anti-cavitation control valve trim concept for use in services where the fluid may have entrained particulate that could plug the passages in or cause erosion damage to conventional anti-cavitation trims. DST is frequently used in high pressure drop applications up to 4000 psid in the
chemical, refining, oil and gas production, and power industries.
- Cavitation Control—2-, 3-, 4-, or 6-stage DST used in a valve properly selected for flow conditions can eliminate cavitation and associated damage and noise.
- Versatility—Available in globe and angle valves, flow up (figure 3) or flow down, from 1- to 8-inch sizes having weld-end or flanged-end connections. Can be used in Design E,EA, EH, EHA, EW, HP, and HPA valves.
- Longer Trim Life—The patented trim concept uses a combined axial and radial flow that features large, open flow paths.
- Easy Maintenance—In-line trim removal allows inspection of parts without taking the valve body out of the pipeline. DST can pass particles that are 0.25 to 0.375 inch in size without plugging.
- Trim Materials—Typical trim materials include 17-4PH SST cages, 416 or 440C SST valve plug, or 316/ENC cages with 316/alloy 6 valve plug. Other materials are available to satisfy application requirements.
- Shutoff—DST also features a protected seat design where the shutoff function of the valve is separate from the throttling areas of the trim.