H42H、H42W立式止回阀正常处于关闭状态，由于管线中进口端介质的压力作用，而克服弹簧阻力使阀门开启。当进口端介质压力低于出口端时，弹簧将阀芯推向阀座而使阀门关闭，阻止介质逆流，故起止回作用。进典阀门H42W立式止回阀由于采用弹簧支撑阀芯，故采用立式安装或卧式装均可。
立式止回阀主要性能规范
| 立式止回阀型号 | 公称压力 PN(MPa) |
强度试验(MPa) | 密封试验(MPa) | 适用温度 (℃) |
适用介质 |
| 壳体 | 密封 | ||||
| H42W-16P | 1.6 | 2.4 | 1.76 | ≤200 | 硝酸类 |
| H42W-25R | 2.5 | 3.75 | 2.75 | ≤200 | 腐蚀性介质 |
| H42W-40P | 4.0 | 6.0 | 4.4 | 水、油品 | 腐蚀性介质 |
| H42W-40R | |||||
| H42Y-40 |
| GB 1.6MPa | ||||||||||||
| DN | 15 | 20 | 25 | 32 | 40 | 50 | 65 | 80 | 100 | 125 | 150 | 200 |
| L | 80 | 90 | 105 | 110 | 120 | 140 | 160 | 185 | 210 | 275 | 300 | 380 |
| D | 95 | 105 | 115 | 135 | 145 | 160 | 180 | 200 | 215 | 245 | 280 | 335 |
| Wt | - | - | - | - | - | 7.5 | 9.5 | 11 | 19.5 | 36.5 | 48 | 65 |
| GB 2.5MPa | ||||||||||||
| DN | 15 | 20 | 25 | 32 | 40 | 50 | 65 | 80 | 100 | 125 | 150 | 200 |
| L | 80 | 90 | 105 | 110 | 120 | 140 | 160 | 185 | 210 | 275 | 300 | 380 |
| D | 95 | 105 | 115 | 135 | 145 | 160 | 180 | 195 | 230 | 270 | 300 | 360 |
| Wt | 7.5 | 9.5 | 12 | 20 | 38 | 49 | 70 | |||||
| GB 4.0MPa | ||||||||||||
| DN | 15 | 20 | 25 | 32 | 40 | 50 | 65 | 80 | 100 | 125 | 150 | 200 |
| L | 80 | 90 | 105 | 110 | 120 | 140 | 160 | 185 | 210 | 275 | 300 | 380 |
| D | 95 | 105 | 115 | 135 | 145 | 160 | 180 | 195 | 230 | 270 | 300 | 375 |
| Wt | 7.5 | 9.5 | 12 | 20 | 38 | 49 | 72 | |||||
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