API Valves - Trim Number Chart

Expired

As per API 600, trim is composed of the following:

  • Stem
  • Body Seating Surface
  • Gate Seating Surface
  • Bushing or a deposited weld for the backseat and stem hole guide
  • Small internal parts that normally contact the service fluid

Select the applicable trim in the interactive display below to get the details of the trim. The overall table showing summary of all the applicable API trims is provided below this interactive display.

Nominal Trim

Seat Surface Material

Cast
Forged
Welded
Minimum Seat Surface Hardness

Stem Bushing Material

Min Stem Hardness
Min Bushing Hardness

Summary of API Trims

Trim Material Seat Disk Backseat Stem Notes
1 F6 This trim is obsolete
2 304 This trim is obsolete
3 F310 310 310 310 310  
4 Hard 410 Hard 410 Hard 410 410 410 Seat 750 HB Min.
5 Hardfaced Stellite Stellite 410 410 Seat 350 HB Min.
5A Hardfaced Ni-Cr Ni-Cr 410 410 Seat 350 HB Min.
6 410 and Cu-Ni Cu-Ni 410 410 410 Seat 250 HB and 175 HB Min. respectively
7 410 and Hard 410 Hard 410 Hard 410 410 410 Seat 250 HB and 750 HB Min. respectively
8 410 and Hardfaced Stellite 410 410 410 Seat 250 HB and 350 HB Min. respectively
8A 410 and Hardfaced Ni-Cr 410 410 410 Seat 250 HB and 350 HB Min. respectively
9 Monel Monel Monel Monel Monel  
10 316 316 316 316 316  
11 Monel and Hardfaced Stellite Monel Monel Monel  
12 316 and Hardfaced Stellite 316 316 316  
13 Alloy 20 Alloy 20 Alloy 20 Alloy 20 Alloy 20  
14 Alloy 20 and Hardfaced Stellite Alloy 20 Alloy 20 Alloy 20  
15 304 and Hardfaced Stellite Stellite 304 304 Seat 350 HB Min.
16 316 and Hardfaced Stellite Stellite 316 316 Seat 350 HB Min.
17 347 and Hardfaced Stellite Stellite 347 3477 Seat 350 HB Min.
18 Alloy 20 and Hardfaced Stellite Stellite  Alloy 20  Alloy 20 Seat 350 HB Min.
19 Nickel Ni Alloy Ni Alloy Ni Alloy Ni Alloy
19A Alloy 625 Alloy 625 Alloy 625 Alloy 625 Alloy 625
19B Alloy C276 Alloy C276 Alloy C276 Alloy C276 Alloy C276
19C Alloy 825 Alloy 825 Alloy 825 Alloy 825 Alloy 825
20 Nickel and Hardfaced Ni Alloy Co-Cr Ni Alloy Ni Alloy Seat 350 HB Min.
20A Alloy 625 and Hardfaced Alloy 625 Co-Cr Alloy 625 Alloy 625 Seat 350 HB Min.

Note: Data provided in Table above is for information and guidance only. For design purpose please use the latest version of API Publication.

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