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Technical Library, Valves, Valves Materials

Valve Trim Chart

Valve Trim Chart

The API trim chart classifies typical combinations of trim materials for commercial valves. The valve trim is the collective name for all the valve parts which are in direct contact with the fluid flowing through the valve (“wet parts”). The trim includes, generally, the disc/plug, the stem, the cage, the seat ring, the gaskets and the packing (however, the list of the valve parts included in the trim depends on the type of valve). The trim of a valve can be replaced for maintenance.

 

API 600 TRIM CHART

The API 600 specification designates some typical combinations of the valve trim materials with a number (API trim #1, trim #2, etc.). The selection of the correct combination of the trim materials is one of the most important decisions to specify valves correctly.

API TRIM # TRIM MATERIAL SEAT DISC/WEDGE BACKSEAT STEM
1 410 410 410 410 410
2 304 304 304 304 304
3 F310 310 310 310 310
4 Hard 410 Hard 410 410 410 410
5 Hardfaced Stellite Stellite 410 410
5A Hardfaced Ni-Cr Ni-Cr 410 410
6 410 and Cu-Ni Cu-Ni Cu-Ni 410 410
7 410 and Hard 410 Hard 410 Hard 410 410 410
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 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

 

API TRIM MATERIAL SELECTION

TRIM RECOMMENDED SERVICE
13% Cr, Type 410 Stainless Steel For oil and oil vapors and general services with heat treated seats and wedges.
13% Cr, Type 410 plus Hardfacing Universal trim for general service requiring long service life up to 1100°F (593°C).*
Type 316 Stainless For liquids and gases which are corrosive to 410 Stainless Steel, up to 1000°F (537°C).*
Monel For corrosive service to 842°F (450°C) such as acids, alkalies, salt solutions, etc.
Alloy 20 For corrosive service such as hot acids -49°F to 608oF (-45°C to 320°C).
NACE Specially treated 316 or 410 trim combined optionally with B7M Bolts and 2HM nuts to meet NACE MR-01-75 requirements.
Full Stellite Full hard faced trim, suitable for abrasive & severe services up to 1200°F (650°C).*

* Depends upon base material grade

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