JWY型无约束波纹补偿器又称为无约束波纹管、无约束膨胀节、直埋式补偿器、该补偿器内的波纹管采用单层、双层或多层Ｕ型波，波纹管和导流套材料为 1Cr18Ni9Ti 等奥氏体不锈钢，其它材料为低碳钢或低合金钢。
无约束波纹补偿器在固定支架间距的确定和固定支座推力计算等和普通的轴向型补偿器完全相同。无约束波纹补偿器除了取消予拉伸工作外，还大大地宽松了安装要求。无约束波纹补偿器可象一段短管一样安装于管道中，不必按其它轴向型膨胀节通常要求的全线钢管接好后再割下和膨胀节等长管道的方法。还由于无约束波纹补偿器坚固的外壳，也方便了运输、安装和保温。
无约束波纹补偿器用途：
无约束波纹补偿器用于管道的轴向补偿，补偿量大，具有强力自导向和超强的抗弯能力，从而可以简化管道导向支架的设计，使导向支架的间距安装均可任意调节。
| 通径 DN | 波数 | 压力等级 Mpa | 波纹管有效面积 cm2 | 最大外径尺寸 mm | 接管端口尺寸 doxs mm | 总长 L mm | ||||
| 0.25 | 0.6 | 1 | 1.6 | 2.5 | ||||||
| 轴向补偿量： mm/ 刚度 N/mm | ||||||||||
| 50 | 8 | 14/153 | 12/318 | 12/318 | 12/635 | 11/1310 | 37 | 120 | ф57 × 3.5 | 361 |
| 16 | 27/76 | 24/158 | 24/158 | 24/318 | 23/655 | 445 | ||||
| 32 | 52/38 | 48/79 | 48/79 | 48/159 | 46/328 | 621 | ||||
| 65 | 8 | 19/213 | 18/213 | 18/213 | 18/424 | 15/814 | 55 | 159 | ф73 × 4 | 377 |
| 12 | 30/142 | 29/142 | 27/142 | 27/283 | 25/421 | 425 | ||||
| 24 | 60/71 | 58/107 | 54/107 | 54/142 | 50/211 | 581 | ||||
| 80 | 8 | 30/179 | 30/179 | 30/358 | 29/358 | 27/650 | 81 | 162 | ф89 × 4 | 430 |
| 10 | 54/143 | 37/143 | 37/286 | 37/286 | 32/325 | 466 | ||||
| 20 | 108/72 | 74/72 | 74/143 | 74/143 | 64/163 | 660 | ||||
| 100 | 6 | 34/138 | 34/277 | 33/417 | 33/417 | 32/817 | 121 | 180 | ф108 × 4 | 410 |
| 10 | 56/83 | 56/166 | 56/250 | 54/250 | 50/409 | 492 | ||||
| 20 | 112/42 | 112/83 | 112/125 | 108/125 | 100/205 | 712 | ||||
| 125 | 5 | 37/136 | 36/272 | 36/408 | 35/408 | 33/801 | 180 | 221 | ф133 × 4 | 410 |
| 9 | 66/76 | 65/151 | 65/227 | 63/227 | 60/401 | 412 | ||||
| 18 | 132/38 | 130/76 | 130/114 | 126/114 | 120/201 | 711 | ||||
| 150 | 5 | 49/100 | 49/200 | 48/300 | 45/456 | 44/845 | 257 | 245 | ф159 × 4.5 | 433 |
| 8 | 88/63 | 78/125 | 77/188 | 71/286 | 65/423 | 518 | ||||
| 16 | 159/32 | 156/63 | 154/94 | 142/143 | 130/211 | 756 | ||||
| 200 | 4 | 58/95 | 56/193 | 56/288 | 56/480 | 55/800 | 479 | 327 | ф219 × 6 | 475 |
| 6 | 86/63 | 85/128 | 85/192 | 84/320 | 80/927 | 553 | ||||
| 12 | 172/32 | 170/64 | 170/96 | 168/160 | 160/200 | 800 | ||||
| 250 | 4 | 75/170 | 74/343 | 63/588 | 53/930 | 50/1856 | 769 | 404 | ф273 × 8 | 500 |
| 6 | 112/113 | 110/228 | 95/392 | 80/620 | 78/927 | 620 | ||||
| 12 | 220/57 | 220/114 | 190/196 | 160/310 | 156/464 | 984 | ||||
| 300 | 4 | 73/250 | 72/503 | 65/830 | 57/1253 | 54/2142 | 1105 | 451 | ф325 × 8 | 584 |
| 6 | 110/167 | 109/335 | 97/553 | 85/835 | 80/1071 | 713 | ||||
| 12 | 220/84 | 218/168 | 194/277 | 170/418 | 160/536 | 1116 | ||||
| 350 | 4 | 79/263 | 78/523 | 72/840 | 64/1265 | 62/2684 | 1307 | 500 | ф377 × 10 | 614 |
| 6 | 119/175 | 117/348 | 107/560 | 97/843 | 90/1342 | 759 | ||||
| 12 | 238/88 | 234/174 | 241/218 | 194/442 | 180/671 | 1216 | ||||
| 400 | 4 | 83/280 | 73/458 | 70/918 | 65/1373 | 63/3675 | 1611 | 537 | ф426 × 10 | 625 |
| 6 | 125/187 | 109/305 | 102/612 | 97/915 | 90/1838 | 771 | ||||
| 12 | 250/94 | 218/153 | 204/306 | 194/458 | 180/920 | 1225 | ||||
| 450 | 4 | 98/203 | 96/405 | 82/690 | 69/2305 | 65/4350 | 1972 | 632 | ф478 × 10 | 620 |
| 6 | 147/135 | 144/270 | 124/460 | 103/1537 | 90/2175 | 762 | ||||
| 12 | 294/68 | 288/135 | 248/230 | 206/769 | 180/1087 | 1200 | ||||
| 500 | 4 | 102/212 | 100/423 | 84/728 | 70/2452 | 65/4256 | 2445 | 699 | ф529 × 10 | 624 |
| 6 | 153/142 | 149/282 | 126/485 | 105/1635 | 90/2128 | 766 | ||||
| 12 | 306/71 | 298/141 | 252/243 | 210/818 | 180/1064 | 1216 | ||||
| 600 | 4 | 123/265 | 121/530 | 86/1468 | 99/1740 | 95/2842 | 3534 | 806 | ф630 × 10 | 676 |
| 6 | 185/177 | 181/353 | 148/978 | 140/1160 | 120/1420 | 848 | ||||
| 12 | 370/89 | 362/177 | 358/489 | 280/580 | 240/710 | 1382 | ||||
| 700 | 4 | 128/287 | 126/573 | 87/1625 | 85/2972 | 84/4100 | 4717 | 915 | ф720 × 10 | 708 |
| 6 | 192/192 | 188/382 | 168/1083 | 131/1982 | 120/2050 | 882 | ||||
| 12 | 384/96 | 376/191 | 336/542 | 262/991 | 240/11025 | 1422 | ||||
