应用：
该类型止回阀用于不锈钢管道系统内，以达到防止流体回流的目的。
技术数据：
若止回阀被安装在一根垂直的管道内，开启阀门所需的压力大约为300-600kpa，最大输送物料压力为800kpa，使用温度范围根据密封件材质的选择而不同，一般常用的三元乙丙橡胶（epdm）是-10℃~ 140℃
材质：
钢制部分：不锈钢304,≤0cr18ni9≥，≤1.4301≥ 不锈钢316l≤00cr17ni14m02≥,≤1.4404≥
密封圈：硅橡胶（vmq),氟橡胶（fpm) 三元乙丙（epdm）
| din | size | a | b | l |
| dn15 | 62.5 | 34.0 | 100.0 | |
| dn20 | 62.5 | 34.0 | 100.0 | |
| dn25 | 77.5 | 50.5 | 103.0 | |
| dn32 | 77.5 | 50.5 | 103.0 | |
| dn40 | 89.0 | 50.5 | 105.0 | |
| dn50 | 105.0 | 64.0 | 111.0 | |
| dn65 | 134.0 | 91.0 | 122.0 | |
| dn80 | 145.0 | 106.0 | 130.0 | |
| dn100 | 158.5 | 119.0 | 130.0 |
3a | size | a | b | b2 | l | l2 | t |
1/2" | 62.5 | 12.7 | 25.4 | 75.0 | 88.6 | 1.65 | |
3/4" | 62.5 | 19.05 | 25.4 | 75.0 | 88.6 | 1.65 | |
1" | 77.5 | 25.4 | 50.5 | 78.0 | 88.6 | 1.65 | |
1 1/2" | 89.0 | 38.1 | 50.5 | 80.5 | 94.3 | 1.65 | |
2" | 105.0 | 50.8 | 64.0 | 86.0 | 105 | 1.65 | |
2 1/2" | 118.5 | 63.5 | 77.5 | 97.0 | 116 | 1.65 | |
3" | 134.0 | 76.2 | 91.0 | 105 | 123.5 | 1.65 | |
4" | 158.5 | 101.6 | 119.0 | 105 | 123.5 | 2.1 |
| sms/iso/idf | size | 3/4" | 1" | 1 1/4" | 1 1/2" | 2" | 2 1/2" | 3" | 4" | 5" | 6" |
| t | 1.5 | 1.5 | 1.5 | 1.5 | 1.5 | 2.0 | 2.0 | 2.0 | 2.0 | 2.0 |
| ds | size | 3/4" | 1" | 1 1/4" | 1 1/2" | 2" | 2 1/2" | 3" | 4" | 5" | 6" |
| t | 1.45 | 1.45 | 1.45 | 1.45 | 1.45 | 1.7 | 2.2 | 2.2 | 2.2 | 2.8 |
| rjt | size | 3/4" | 1" | 1 1/4" | 1 1/2" | 2” | 2 1/2" | 3" | 4" | 5" | 6" |
| b | 19.5 | 25.65 | 32.05 | 38.35 | 51.05 | 63.75 | 76.45 | 101.85 | 127.25 | 152.4 | |
| t | 1.725 | 1.725 | 1.725 | 1.725 | 1.725 | 1.725 | 1.725 | 2.125 | 2.125 | 2.2 |
