Removable/replaceable ,functional parts of the valve that are exposed to the flow medium such as stem,closure member and seating surfaces is termed as trim.(Valve body,bonnet,yoke does not include in trim)
The number corresponding to material used in API 600 and API 602 are termed as Trim Numbers
TRIM | MATERIAL | SEAT | DISC | BACKSEAT | STEM | NOTES |
---|---|---|---|---|---|---|
1 | 410 | 410 | 410 | 410 | 410 | |
2 | 304 | 304 | 304 | 304 | 304 | |
3 | F310 | 310 | 310 | 310 | 310 | |
4 | Hard 410 | Hard 410 | Hard 410 | 410 | 410 | seats 750BHN Min. |
5 | Hardfaced | Stellite | Stellite | 410 | 410 | |
5A | Hardfaced | Ni-Cr | Ni-Cr | 410 | 410 | |
6 | 410 and Cu-Ni | Cu-Ni | 410 | 410 | 410 | |
7 | 410 and Hard 410 | Hard 410 | Hard 410 | 410 | 410 | seats 750BHN Min. |
8 | 410 and Hardfaced | Stellite | 410 | 410 | 410 | |
8A | 410 and Hardfaced | Ni-Cr | 410 | 410 | 410 | |
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 | |
16 | 316 and Hardfaced | Stellite | Stellite | 316 | 316 | |
17 | 347 and Hardfaced | Stellite | Stellite | 347 | 3477 | |
18 | Alloy 20 and Hardfaced | Stellite | Stellite |