閥門（valve）是流體輸送系統中的控制部件，具有截止、調節、導流、防止逆流、穩壓、分流或溢流泄壓等功能。
國內各種閥門制造標準：
| 類別 | 設計 | 壓力溫度等級 | 結構長度 | 1連接端尺寸 | 試驗與檢驗 | ||
| 法蘭端 | 對焊端 | ||||||
| 電站閥門 | JB/T3595(E101) | JB/T3595(E101) | JB/T3595(E101) | / | GB12224 (ASNIB16.25) |
JB/T359
5(E101) |
|
| 低溫閥門 | JB/T7749 | / | GB12221 | JB/T79 | GB12224 | JB9092 | |
| 縮徑鍛鋼閥門 | JB/T7746(代替ZBJ16005) | GB9131 JB/T7746 |
GB12221 JB/T7746 GB/T15188.1 |
GB9113 | GB12224 | JB9092 | |
| 蒸汽疏水閥 | ZBJ16007 | / | GB12250 | GB4216 GB9113 |
/ | GB12251 | |
| 減壓閥 | GB12244 GB12246 |
/ | JB2205 | GB4216 GB9113 |
GB12224 | GB/T13927 GB12245 |
|
| 安全閥 | GB122421 GB12243 |
/ | JB2203 | GB9113 JB/T2769 |
GB12224 | GB12242 | |
| 鐵制旋塞閥 | GB12240 | GB4216.1 GB12232 |
GB12221 GB 12240 |
GB4216 | / | GB/T13927 | |
| 隔膜閥 | GB12239 | 選定 | GB12221 GB12239 |
GB4216 GB9113 |
/ | GB/T13927 | |
| 閘閥 | 鋼制楔式 | GB12234 | BG9131 | GB12231 | GB9113 GB9113 |
GB12224 | JB/T9092 (代替ZBJ6006) |
| 鐵制楔式 | GB12232 | GB4216.1 GB12232 |
GB12231 | GB4216 GB 9113 |
/ | GB13927 (代替GB498) |
|
| 管線鋼制平板 | JB/T5298 | GB9131 | JB/T5298 | GB9113 GB9115 |
GB12224 | JB9092 | |
| 鐵制雙平板 | JB/TQ648 | GB4216.1 GB12232 |
JB/T5298 | GB4216.2～5 | / | GB/T13927 | |
| 截止閥 | 鋼制 | GB12235 | GB9131 | GB12221 | GB9112 | GB12224 | JB9092 |
| 鐵制 | GB12232 | GB4216.1 GB12232 |
GB12221 GB12233 |
GB9113 | / | GB/T13927 | |
| 針形 | JB/T7747 | GB9131 | GB/T15188 | GB9116 | GB12224 | JB9092 | |
| 球閥 | 鋼制 | GB12237 | GB9131 | GB12221 GB12237 |
GB9113 | / | JB9092 |
| 鐵制、銅制 | GB/T15185 | GB4216.1 GB12386 GB/T15185 |
GB12221 GB/T15188.3 |
/ | / | GB13927 | |
| 管線鋼制 | JB/T7745 | GB9131 GB12224 |
GB12221 JB/T7745 |
GB9113 | GB12224 | JB9092 | |
| 止回閥 | 鋼制旋啟式 | GB12236 | GB9131 | GB12221 | GB9113 GB4216 GB12380 |
GB12224 | JB9092 |
| 鐵制旋啟式 | GB/T13932 | GB4316.1 GB12232 |
GB12221 JB/T3932 |
GB9113 GB/T13402 |
/ | GB13927 | |
| 鋼制升降式 | GB12235 | GB9131 | GB12221 | GB9112 GB9113 |
JB9092 | ||
| 鐵制升降式 | GB12233 | GB4316.1 GB12232 |
GB12221 GB12233 |
GB4216 GB9113 |
/ | GB13927 | |
| 蝶閥 | 法蘭、對夾 | GB12238 | GB9131 GB4216.1 GB12232 |
GB12221 | GB4216.2～4 GB9113 |
GB12224 | GB13927 |
| 金屬密封 | JB/T8527 | GB9131 GB12386 |
GB12221 GB/T15188.2 |
GB9113 GB9115 GB12380 |
/ | GB13927 | |
| 煙道 | JB/T8692 | GB9131 | GB12221 GB/T15188.2 |
GB9115 | / | JB9092 | |