API 600 Trim Number Chart

API 600 trim number chart for trim parts: stem, back seat, disc/wedge, seat surface of gate valves, globe valves and check valves. API 600 valve trim available from trim no. 1 to 18. Trim No. 1, 5, 8 are the most frequestly used for no-corrosion service.

Trim materials such as discs, seats, stems, back sheets, and sleeves are grouped together and assigned one number called trim number. This defines the material grade for each component.

Valve trims are selected based on the service conditions like the temperature, pressure, chemical composition, flow velocity, etc. . The sustainability of the material, to resist corrosion can be determined by corrosion resistance tables and selecting accordingly from them.

Trim No. 1: Gate Valve, Body: A216 WCB, Disc: A216 WCB+13Cr, Seat: A105+13Cr, Stem: A276 410/A182 F6A

Trim No. 5: Gate Valve, Body: A216 WCB, Disc: A216 WCB+STL, Seat: A105+STL, Stem: A276 410/A182 F6A

Trim No. 8: Gate Valve, Body: A216 WCB, Disc: A216 WCB, Seat: A105+STL, Stem: A276 410/A182 F6A

Trim No. 10: Gate Valve, Body: A351 CF8M, Disc: A351 CF8M, Seat: A351 CF8M, Stem: A182 F316

API 600 Trim Chart

Trim No.	Material	Seat	Disc	Backseat	Stem	Notes
1	410	13Cr	13Cr	13Cr	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	347
18	Alloy 20 and Hardfaced	Stellite	Stellite	Alloy 20	Alloy 20