Fisher Dirty Service Trim for Out-Gassing Applications (DST-G)0 pages

Product Bulletin

DST-G Trim

80.2:023
July 2012

D103396X012

Fisherr Dirty Service Trim for Out-Gassing
Applications (DST-G)
Fisher Dirty Service Trim for out-gassing applications
(DST-G) is a multi-stage control valve trim design. It is
used in services where the fluid has dissolved gases
that are released from the solution due to a reduction
in pressure and may also contain entrained particulate.
DST-G is mainly used in Refining and Oil & Gas
applications.

Features

Out­gassing Control– Multi-stage DST-G, used in a
valve properly selected for flow conditions, can
minimize effects from out-gassing and associated
damage, vibration, and noise.

Long Trim Life– The trim concept uses a combined
axial and radial flow that features large, open flow
paths similar to the standard multi-stage DST. The
lower cage utilizes large slots to separate the flow
into smaller jets containing less energy and
therefore extending trim life.

Easy Maintenance– Inline trim removal allows
inspection of parts without taking the valve body
out of the pipeline.

Trim Materials– Standard trim materials consist of a
plug, seat ring, and upper cage fabricated from 316
SST with Alloy 6 hardfacing, and a lower cage
machined from solid Alloy 6. Additional trim
combinations can be found in table 2.

Shutoff– DST-G also features a protected seat
design where the shutoff function of the trim is
separate from the throttling areas. DST-G comes
standard with class V shutoff.

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W9607

Fisher DST-G Plug and Cage