5/30/2023 0 Comments Trim tabber![]() Overlay of trim material directly on the main components is allowed. It is important to understand that the trim is only the contact surface where the parts seals against each other, and not the entire components. The surfaces of the body and gate which comes in contact is considered the important trim of the API 600 valve and are selected to resist the wear and media corrosion. The stem is considered a major trim component, and one of the few trims which traceability may be maintained due to adequate size. It must be strong enough to not buckle or break under the required thrust and torque for operating the valve while resisting corrosion and wear of external element and internal media and maintaining a seal at the packing box. The stem of a gate valve is responsible for allowing control of the gate. Alternatively, trim can be understood to be parts of the valve exposed to the service fluid, which needs to resist wear and corrosion to maintain the basic functions of the valve containing and sealing the flow media. The trims of a gate valve is officially defined in API 600 as the stem, the body seating surface, the gate seating surface, the backseat bushing, and the small internal parts that normally contact the service fluid. API Trim 20C - Co-Cr A (Stellite 6) Single-hardfaced + UNS N08825 (Incoloy 825) Seat Surfaces | UNS N08825 (Incoloy 825) Stem & Backseat Bushing.API Trim 19C 1 - Non-hardfaced UNS N08825 (Incoloy 825) Seat Surfaces | UNS N08825 (Incoloy 825) Stem & Backseat Bushing.API Trim 20B - Co-Cr A (Stellite 6) Single-hardfaced + Alloy C276 (Hastelloy C-276) Seat Surfaces | Alloy C276 (Hastello圜-276) Stem & Backseat Bushing.API Trim 19B 1 - Non-hardfaced Alloy C276 (Hastelloy C-276) Seat Surfaces | Alloy C276 (Hastelloy C-276) Stem & Backseat Bushing.API Trim 18 - Co-Cr A (Stellite 6) Dual-hardfaced Seat Surfaces | 19Cr-29Ni (Alloy 20 Nickel) Stem & Backseat Bushing.API Trim 14 - Co-Cr A (Stellite 6) or Ni-Cr Single-hardfaced + 19Cr-29Ni (Alloy 20 Nickel) Seat Surfaces | 19Cr-29Ni (Alloy 20 Nickel) Stem & Backseat Bushing.API Trim 13 1 - Non-hardefaced 19Cr-29Ni (Alloy 20 Nickel) Seat Surfaces | 19Cr-29Ni (Alloy 20 Nickel) Stem & Backseat Bushing.API Trim 11 - Co-Cr A (Stellite 6) or Ni-Cr Single-hardfaced + Ni-Cu (Monel) Alloy Seat Surfaces | Ni-Cu Alloy (Monel) Stem & Backseat Bushing.API Trim 9 1 - Non-hardfaced Ni-Cu Alloy (Monel) Seat Surfaces | Ni-Cu Alloy (Monel) Stem & Backseat Bushing.API Trim 21 3 - Co-Cr A (Stellite 6) Dual-hardfaced Seat Surfaces | Nickel Alloy Stem & Backseat Bushing.API Trim 20 3 - Co-Cr A (Stellite 6) Single-hardfaced + Nickel Alloy Seat Surfaces | Nickel Alloy Stem & Backseat Bushing.API Trim 19 1, 3 - Non-hardfaced Nickel Alloy Seat Surfaces | Nickel Alloy Stem & Backseat Bushing.API Trim 17 - Co-Cr A (Stellite 6) Dual-hardfaced Seat Surfaces | 18Cr-10Ni-Cb (347 SS) Stem & Backseat Bushing.18Cr-10Ni-Cb (347 Stainless Steel ) Trim. ![]() API Trim 15 - Co-Cr A (Stellite 6) Dual-hardfaced Seat Surfaces | 25Cr-20Ni (310 SS) Stem & Backseat Bushing.API Trim 3 - Non-hardefaced 310 SS Seat Surfaces | 25Cr-20Ni (310 SS) Stem & Backseat Bushing.API Trim 15 - Co-Cr A (Stellite 6) Dual-hardfaced Seat Surfaces | 18Cr-Ni (304 SS) Stem & Backseat Bushing.API Trim 2 - Non-hardefaced 304 SS Seat Surfaces | 18Cr-Ni (304 SS) Stem & Backseat Bushing.API Trim 8A 2 - Ni-Cr Single-hardfaced + 13Cr (410 SS) Seat Surfaces | 13Cr (410 SS) Stem & Backseat Bushing.API Trim 7 - Single "Hardened" 13Cr (410 SS) + Standard 13Cr (410 SS) Seat Surfaces | 13Cr (410SS) Stem & Backseat Bushing.API Trim 5B 2 - UNS R31233 (Ultimet) Dual-hardfaced Seat Surfaces | 13Cr (410 SS) Stem & Backseat Bushing.API Trim 5A 2 - Ni-Cr Dual-hardfaced Seat Surfaces | 13Cr (410 SS) Stem & Backseat Bushing.API Trim 4 - Dual "Hardened" 13Cr (410 SS) Seat Surfaces | 13Cr (410SS) Stem & Backseat Bushing.
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