{"id":44079,"date":"2026-07-25T18:25:27","date_gmt":"2026-07-25T18:25:27","guid":{"rendered":"https:\/\/valve-atlas.com\/2026\/07\/25\/how-to-read-valve-codes-wcb-cf8m-trim\/"},"modified":"2026-07-25T19:22:50","modified_gmt":"2026-07-25T19:22:50","slug":"how-to-read-valve-codes-wcb-cf8m-trim","status":"publish","type":"post","link":"https:\/\/valve-atlas.com\/fr_ca\/2026\/07\/25\/how-to-read-valve-codes-wcb-cf8m-trim\/","title":{"rendered":"Comment lire les codes des vannes\u00a0: WCB, CF8M, num\u00e9ros de garniture, explication de la classe 800"},"content":{"rendered":"

Every industrial valve quotation is written in shorthand: “2” 800# A105 gate, welded bonnet, F8 trim” or “6” 150# WCB\/13Cr API 600”. If you can read these codes, you can compare offers line by line — and catch a wrong material before it ships. Here is the decoder.<\/p>\n

1. Size and Pressure Class<\/h2>\n

NPS<\/strong> (nominal pipe size, inches) or DN<\/strong> (mm) gives the bore; Class<\/strong> (150 \/ 300 \/ 600 \/ 800 \/ 1500 \/ 2500, often written 150#) gives the ASME B16.34 pressure-temperature rating. Class 800 is an intermediate class used almost exclusively for forged small-bore valves per API 602<\/a>.<\/p>\n

2. Body Material Codes<\/h2>\n\n\n\n\n\n\n\n\n\n
Code<\/th>\nMaterial<\/th>\nWhere you see it<\/th>\n<\/tr>\n
WCB<\/td>\nCast carbon steel<\/td>\nGeneral process, −29 to +425 °C<\/td>\n<\/tr>\n
LCB \/ LCC<\/td>\nLow-temp cast carbon steel<\/td>\nDown to −46 °C<\/td>\n<\/tr>\n
WC6 \/ WC9<\/td>\nCr-Mo alloy castings<\/td>\nHigh-temperature steam<\/td>\n<\/tr>\n
CF8 \/ CF8M \/ CF3M<\/td>\nCast 304 \/ 316 \/ 316L stainless<\/td>\nCorrosive, hygienic, cryogenic<\/a><\/td>\n<\/tr>\n
A105<\/td>\nForged carbon steel<\/td>\nSmall-bore forged valves<\/td>\n<\/tr>\n
LF2<\/td>\nForged low-temp carbon steel<\/td>\nCold climates, −46 °C<\/td>\n<\/tr>\n
F316\/F316L, F51\/F55<\/td>\nForged stainless \/ duplex<\/td>\nChlorides, offshore — see stainless range<\/a><\/td>\n<\/tr>\n<\/table>\n

3. Trim Numbers (API 600 Table)<\/h2>\n

“Trim” = the wetted internals: seat, wedge\/disc facing, stem, backseat. API trim numbers standardize combinations: Trim 1<\/strong> (13Cr \/ F6a), Trim 5<\/strong> (Stellite hardfaced), Trim 8<\/strong> (13Cr with hardfaced seats), Trim 12<\/strong> (316 stainless), Trim 10<\/strong> (Monel), Trim 16<\/strong> (F316 + Stellite). If the fluid is erosive or the valve throttles, hardfacing (Trim 5\/8\/16) earns its cost back quickly.<\/p>\n

4. Ends, Bonnet, Operator<\/h2>\n