Absorb dimensional changes mainly caused by thermal expansion or contraction of a pipeline, duct, or vessel.
1. Nominal bore: (mm): 20, (Ins): 3/4. 2. Total length(mm): 250. 3. Bellows: (O.D.): 32, (Corr's No): 31. 4. Axial movement(mm): +5 -25. 5. Force to compress(kg): 34. 6. Effective area(cm2): 5.4.