H42F氨用止回閥產品概述：
止回閥是能自動阻止流體倒流的閥門。止回閥的閥瓣在流體壓力作用下開啟，流體從進口側流向出口側。當進口側壓力低于出口側時，閥瓣在流體壓差、本身重力等因素作用下自動關閉以防止流體倒流。
H42F氨用止回閥性能規范：
| 型 號 | 公稱 | 主要結構尺寸(mm) | 閥體 材料 | 性能規范 | ||||||
| 通徑DN(mm) | 壓力 PN(MPa) | D | D1 | L | L1 | H | 適用溫度（℃） | 適用介質 | ||
| H42F-25 | 100 | 2.5 | 230 |
| 210 |
|
| 碳鋼 | ≤150 | 氨氣、蒸氣等 |
| " | 125 | " | 270 |
| 275 |
|
| " | " | " |
| " | 150 | " | 300 |
| 300 |
|
| " | " | " |
| " | 200 | " | 360 |
| 380 |
|
| " | " | " |
| H42F-40 | 100 | 4.0 | 230 |
| 210 |
|
| 碳鋼 | ≤150 | 氨氣、蒸氣等 |
| " | 125 | " | 270 |
| 275 |
|
| " | " | " |
| " | 150 | " | 300 |
| 300 |
|
| " | " | " |
| " | 200 | " | 375 |
| 380 |
|
| " | " | " |
外形連接尺寸：
| 公稱壓力 | 公稱通徑 | 主要連接尺寸 | 外形 | ||||||||
| L | D | D 1 | D 2 | D 6 | b | f | f 1 | Z-φd | H | ||
| H42F-16P.R | 40 | 200 | 145 | 110 | 85 | - | 16 | 2 | - | 4-18 | 95 |
| 50 | 230 | 160 | 125 | 100 | - | 16 | 2 | - | 4-18 | 105 | |
| 65 | 290 | 180 | 140 | 120 | - | 18 | 2 | - | 4-18 | 120 | |
| 80 | 310 | 195 | 165 | 135 | - | 20 | 3 | - | 8-18 | 130 | |
| 100 | 350 | 215 | 180 | 155 | - | 20 | 3 | - | 8-18 | 140 | |
| 125 | 400 | 245 | 210 | 185 | - | 22 | 3 | - | 8-12 | 155 | |
| 150 | 480 | 280 | 240 | 210 | - | 24 | 3 | - | 8-23 | 180 | |
| 200 | 600 | 335 | 295 | 265 | - | 26 | 3 | - | 12-23 | 215 | |
