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Product Description
NP Type Negative Pressure Rubber Joint
Product introduction
NP type negative pressure rubber joints are mainly used for vacuum equipment. DN40-DN200 is the first choice for negative pressure ring (spot); DN25-DN600 can also choose negative pressure diversion tube or negative pressure belt (customized for 10 days); except for the above 3 types in addition to pressure products, our factory also uses custom-made rubber internal prefabricated negative pressure ring technology, a single model needs more than l0 can be customized;
Drawing
Performance Parameter Table
| Nominal diameter | Length | Outer diameter | Flange thickness | central circle diameter | Number of bolts | Bolt hole diameter | Stretch | Compression | Displacemen | Deflection | Limit | |
| mm | inch | L (mm） | D (mm) | T (mm) | D1 (mm) | n (pcs) | d (mm) | (mm) | (mm) | (mm) | ° | Quantity |
| 25 | 1 | 95 | 115 | 13 | 85 | 4 | 14 | 6 | 9 | 9 | 15° | / |
| 32 | 1-1/4 | 95 | 135 | 15 | 100 | 4 | 18 | 6 | 9 | 9 | 15 | / |
| 40 | 1-1/2 | 95 | 145 | 15 | 110 | 4 | 18 | 6 | 10 | 9 | 15° | / |
| 50 | 2 | 105 | 160 | 15 | 125 | 4 | 18 | 7 | 10 | 10 | 15 | / |
| 65 | 2-1/2 | 115 | 180 | 16 | 145 | 4 | 18 | 7 | 13 | 11 | 15 | / |
| 80 | 3 | 135 | 195 | 18 | 160 | 8 | 18 | 8 | 15 | 12 | 15 | / |
| 100 | 4 | 150 | 215 | 20 | 180 | 8 | 18 | 10 | 19 | 13 | 15 | / |
| 125 | 5 | 165 | 245 | 20 | 210 | 8 | 18 | 12 | 19 | 13 | 15° | / |
| 150 | 6 | 180 | 280 | 22 | 240 | 8 | 23 | 12 | 20 | 14 | 15 | / |
| 200 | 8 | 210 | 335 | 24 | 295 | 12 | 23 | 16 | 25 | 22 | 10° | / |
| 250 | 10 | 230 | 405 | 26 | 355 | 12 | 26 | 16 | 25 | 22 | 10° | / |
| 300 | 12 | 245 | 460 | 28 | 410 | 12 | 26 | 16 | 25 | 22 | 10° | / |
| 350 | 14 | 255 | 520 | 30 | 470 | 16 | 26 | 16 | 25 | 22 | 10° | 4 |
| 400 | 16 | 255 | 580 | 32 | 525 | 16 | 30 | 16 | 25 | 22 | 10° | 4 |
| 450 | 18 | 255 | 640 | 34 | 585 | 20 | 30 | 16 | 25 | 22 | 5 | 4 |
| 500 | 20 | 255 | 705 | 36 | 670 | 20 | 33 | 16 | 25 | 22 | 5 | 5 |
| 600 | 24 | 260 | 840 | 38 | 770 | 20 | 36 | 16 | 25 | 22 | 5 | 5 |
