Dirty service applications are known to contain entrained particulate that would clog the flow passages of trim that this designed for use in clean service. Dirty service trim constructions are capable of passing particles up to 0.75 inches in size, depending on valve size.
Available in NPS 2x3, 3x4, 4x6, and 6x8 sizes with either flanged or welding ends. The increased outlet size
reduces outlet fluid velocity to reduce flashing, outgassing, and cavitation damage with proper trim material selection.
Fisher Dirty Service Trim (DST) is a multi-stage (2, 3, 4, 5, or 6 stage) anti-cavitation trim used with a variety of control valves.
Fisher Dirty Service Trim for out-gassing applications (DST-G) is a multi-stage anti-cavitation trim.
NotchFlo DST valve with 3-, 4-, and 6-stage NotchFlo anti-cavitation severe service trim offer control of high pressure drop liquids (up to 4200 psi) while avoiding the damaging effects of cavitation.