• Cavitation Control—2-, 3-, 4-, 5-, 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 down (figure 3) or flow up (figure 4), from NPS 1 to 16 having weld-end or flanged-end connections. Can be used in easy-e®, EH, EHA, EW, HP, and HPA valves.
• Long Trim Life—This patented trim concept uses a combined axial and radial flow that features large, open flow paths and decreased clearance flow erosion.
• Flexibility— In many cases DST can be retrofitted to replace Cav III trims that are currently in service. DST can pass 1/4 to 3/4 inch particles without plugging.
• Easy Maintenance—In-line trim removal allows inspection of parts without taking the valve body out of the pipeline.
• Trim Materials—Typical trim materials include 17-4PH SST cages, 440C SST valve plug and seat, 316/ENC/alloy 6 cages with 316/alloy 6 valve plug and seat, or S32550/ENC/alloy 6 cages with S32550/alloy 6 valve plug and seat. Other materials are available to satisfy application requirements.
• Sour Service Capability—Materials are available for applications handling sour fluids. Please contact your local Emerson Process Management sales office for additional information.
• Shutoff—DST also features a protected seat design where the shutoff function of the valve is separate from the throttling areas of the trim.

• Trim A: Trim A is the typical trim used with carbon steel and alloy steel valve bodies. It can generally be used in severe service applications up to 316°C (600°F). Higher temperature can be achieved with alternate trim parts. Contact your Emerson Process Management sales office for higher temperature requirements. Typical applications for Trim A include boiler feedwater, water, non-sour hydrocarbons, and other non-sour liquids.
• Trim B: Trim B is the typical trim used with stainless steel valve bodies. It can generally be used in severe service applications up to 316°C (600°F). Higher temperatures can be achieved with alternate trim parts. Contact your Emerson Process Management sales office for higher temperature requirements. Typical applications for Trim B include produced water, water, sour hydrocarbons, and other sour liquids. Not for use with boiler feedwater.
• Trim C: Trim C can commonly be seen in carbon steel and Duplex SST valve bodies. This trim is most commonly used in sea water applications, produced water, and other offshore crude oil applications.

Please contact your Emerson Process Management sales office for more information on DST trim.

Available Valves

easy-e, EH, EHA, EU, EW, HP, and HPA.
See table 2

End Connection Styles

Refer to appropriate valve bulletin

Valve Body Dimensions and Weights

Valve type, pressure class, and number of stages will result in changes to these values. Please consult your Emerson Process Management sales office for more information on finished dimensions and weights

Shutoff Classifications

Class V per ANSI/FCS 70-2 and IEC 60534-4

Maximum Inlet Pressures and Temperatures(1)

Consistent with applicable CL600, CL900, CL1500, and CL2500 pressure/temperature ratings according to ASME B16.34 ratings unless limited by individual temperature and pressure limits shown in tables 1 and 3

Maximum Pressure Drop(1)

See table 1

Construction Materials

Trim Parts: 17-4PH SST cages, 440C SST valve plug and seat or 316/ENC/alloy 6 cages with 316/Alloy 6 valve plug and seat. S32550/ENC/alloy 6 cages, S32550/alloy 6 valve plug and seat. Trim can be made from several other bar stock alloys. Consult your Emerson Process Management sales office for your specific application

Temperature Capabilities

Valve Body/Trim Combinations: See table 3 All Other Parts: Consult your Emerson Process Management sales office

Flow Coefficients

See table 2

Flow Characteristic

Linear

Flow Direction

Flow down (typical) or Flow up (available)

Valve Cavitation Coefficient

Kc = 1.0 for all valves when trim is used within applicable pressure drop limits.

Maximum Valve Plug Travel

Typical plug travels are 0.75 inch through 2 inch. Contact your Emerson Process Management sales office for your specific application

Minimum Seating Force

Use Class V seat load requirements

Note
Neither Emerson, Emerson Process Management, nor any of their affiliated entities assume responsibility for the selection, use, or maintenance of any product. Responsibility for the selection, use, and maintenance of any product remains with the purchaser and end-user.