Herberts - Model DIN28120 - Sight Glass Fitting - Brochure

After welding base flange onto or into vessel wall, seals, glass disc and flange are placed together in the order shown. Then the nuts (in case of studded base flange) and washers are progressively tightened, always working on diametrically opposted pairs of nuts at time. Tightening torque values are given in table on overleaf. Other information can be taken from DIN28120.