法兰止回阀是依靠介质流动压力自动开闭的阀门，主要用于防止介质倒流，确保管道系统单向流动。其结构包括阀体、阀盖和阀瓣，通过阀瓣的旋转或升降运动实现开启和关闭。广泛应用于石油、化工、制药、电力等行业，介质涵盖水、油品、蒸汽及酸性液体，工作温度范围可达-29℃至+550℃。
规格参数表[mm]
| 公称压力 | 法兰式止回阀组件型号 | 对夹止回阀型号 | 垫片型号 | 通径DN | B | S | L | A | 螺栓规格 | 螺栓 | C | D |
| 16bar | HR16-DN40-48.3*2.6-SS | H71W-PN25/DN40-SS | FD-DN40-SS | 40 | 48.3 | 2.6 | 123 | 150 | M16*95 | 4 | 35 | 87 |
| HR16-DN50-60.3*2.9-SS | H71W-PN25/DN50-SS | FD-DN50-SS | 50 | 60.3 | 2.9 | 134 | 165 | M16*105 | 4 | 40 | 103 | |
| HR16-DN65-76.1*2.9-SS | H71W-PN25/DN65-SS | FD-DN65-SS | 65 | 76.1 | 2.9 | 143 | 185 | M16*115 | 4 | 49 | 124 | |
| HR16-DN80-88.9*3.2-SS | H71W-PN25/DN80-SS | FD-DN80-SS | 80 | 88.9 | 3.2 | 161 | 200 | M16*125 | 8 | 57 | 138 | |
| HR16-DN100-114.3*3.6-SS | H71W-PN25/DN100-SS | FD-DN100-SS | 100 | 114.3 | 3.6 | 176 | 220 | M16*135 | 8 | 68 | 161 | |
| HR16-DN125-139.7*4.0-SS | H71W-PN25/DN125-SS | FD-DN125-SS | 125 | 139.7 | 4 | 192 | 250 | M16*150 | 8 | 78 | 185 | |
| HR16-DN150-168.3*4.5-SS | H71W-PN25/DN150-SS | FD-DN150-SS | 150 | 168.3 | 4.5 | 209 | 285 | M20*170 | 8 | 95 | 207 | |
| 25bar | HR25-DN40-48.3*2.6-SS | H71W-PN25/DN40-SS | FD-DN40-SS | 40 | 48.3 | 2.6 | 129 | 150 | M16*100 | 4 | 35 | 87 |
| HR25-DN50-60.3*2.9-SS | H71W-PN25/DN50-SS | FD-DN50-SS | 50 | 60.3 | 2.9 | 140 | 165 | M16*110 | 4 | 40 | 103 | |
| HR25-DN65-76.1*2.9-SS | H71W-PN25/DN65-SS | FD-DN65-SS | 65 | 76.1 | 2.9 | 157 | 185 | M16*120 | 4 | 49 | 124 | |
| HR25-DN80-88.9*3.2-SS | H71W-PN25/DN80-SS | FD-DN80-SS | 80 | 88.9 | 3.2 | 177 | 200 | M16*135 | 8 | 57 | 138 | |
| HR25-DN100-114.3*3.6-SS | H71W-PN25/DN100-SS | FD-DN100-SS | 100 | 114.3 | 3.6 | 202 | 235 | M20*150 | 8 | 68 | 161 | |
| HR25-DN125-139.7*4.0-SS | H71W-PN25/DN125-SS | FD40-DN125-SS | 125 | 139.7 | 4 | 218 | 270 | M24*165 | 8 | 78 | 185 | |
| HR25-DN150-168.3*4.5-SS | H71W-PN25/DN150-SS | FD40-DN150-SS | 150 | 168.3 | 4.5 | 249 | 300 | M24*190 | 8 | 95 | 207 |
