Welded Metal-Bellows Mechanical Seal HF680 1. Temperature:-60--400 2. pressure:0-3. ... 4. Shaft:20-200mm. Welded Metal-Bellows Mechanical Seal HF680:Technical parameters:1. Temperature:-60--400oC.2. pressure:0 ... . Shaft:20-200mm.Application:Welded Metal-Bellows mechanical seals HF680 have a universal field of appication. They are designed ... or other standard. Welded Metal-Bellows Mechanical Seal HF680