H44H-25止回阀适用于压力 1.6~25MPa/2.0-42.0MPa 工作温度 -29~+550℃ 的石油、化工、制药、化肥、电力行业等各种工况的管路上，适用介质为水、油品、蒸汽、酸性介质等。是控制管道内介质单向流向的阀门，用来防止管路中的介质倒流。
H44H-25止回阀主要性能规范Chief property and specification
| 试验压力(MPa) Test Pressure | 公称压力Nominal pressure(Lb) | |||
| 150 | 300 | 400 | ||
| 壳体强度试验 Shellstrenghttest | 3.1 | 7.8 | 10.3 | |
| 密封试验 Seal test | 2.2 | 5.6 | 7.6 | |
| 阀体材料 Material of valve | WCB(C) | CF8(P) | CF8M(R) | WC6 WC9(V) |
| 工作温度(℃) Workingtemperature | ≤425 | ≤100 | ≤100 | ≤540 |
| 适用介质 Applicablemedium | 水、蒸汽、油品 Water,steam,Oil | 硝酸类 Nitricacidl | 醋酸类 Acetic acidl | 水、蒸汽 Water,Steam |
主要尺寸及重量Main dimensions and weight
| 公称通径NPS Nominal diameter | 单位 Unit | 主要外形尺寸及连接尺寸 | 重量(kg) Weight | |||||||
| in | mm | l | D | D1 | D2 | b | z-d | H | ||
| 2" | 50 | in | 9.00 | 6.00 | 4.75 | 3.62 | 0.75 | 4-0.75 | 6.34 | 16.6 |
| mm | 203 | 157 | 120.7 | 92 | 19.50 | 4-19 | 161 | |||
| 2 1/2" | 65 | in | 8.50 | 7.00 | 5.50 | 4.12 | 0.88 | 4-0.75 | 7.08 | 22.5 |
| mm | 216 | 178 | 139.7 | 105 | 22.5 | 4-19 | 180 | |||
| 3" | 80 | in | 9.50 | 7.50 | 6.00 | 5.00 | 0.94 | 4-0.75 | 7.48 | 32.5 |
| mm | 241 | 190.5 | 152.4 | 127 | 24 | 4-19 | 190 | |||
| 4" | 100 | in | 11.50 | 9.00 | 7.50 | 6.19 | 0.94 | 8-0.75 | 8.66 | 53.8 |
| mm | 292 | 229 | 190.50 | 157.2 | 24 | 8-19 | 220 | |||
| 6" | 150 | in | 14.00 | 11.00 | 9.50 | 8.5 | 1.00 | 4-0.88 | 10.12 | 83.8 |
| mm | 356 | 279 | 241.5 | 216 | 25.5 | 8-22.5 | 257 | |||
| 8" | 200 | in | 19.50 | 13.50 | 11.75 | 10.62 | 1.12 | 8-0.88 | 11.50 | 141.3 |
| mm | 495 | 343 | 298.5 | 270 | 29 | 8-22.5 | 292 | |||
| 10" | 250 | in | 24.5 | 16.00 | 14.25 | 12.75 | 1.19 | 12-1.00 | 13.78 | 190.5 |
| mm | 622 | 406 | 362 | 324 | 30.5 | 12-25 | 350 | |||
| 12" | 300 | in | 27.50 | 19.00 | 17.00 | 15.00 | 1.25 | 12-1.00 | 15.60 | 292 |
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