QUALITY FEATURES PTFE-VALVE T 211-C TOP FLANGE DESIGN with centering projection and double flat shaft end according to EN ISO 5211. SHAFT BEARING All nominal diameters have a multiple, maintenancefree shaft bearing. FUNCTIONAL SURFACES The functional surfaces of the shaft seal are machined to precise tolerances. Forcible adaptation is damaging due to the resilience of PTFE and is avoided in this design. SAFETY SEAL The one-piece, blow-out proof shaft/disc is coated with PFA including the safety seal. The disc is covered with at least 3mm. All sealing surfaces are machined. PTFE LINER The PTFE liner is isostatically pressed and at least 3mm thick. The broad, chambered sealing strips also serve as a double-sided flange seal. BALL PRINCIPLE The proven seal according to the ball principle between disc and PTFE liner ensures reliable long-term operation, without critical transitions. DOUBLE SEALS Double seals as standard on both shaft ducts. Primary seal (= main seal) achieved by prestressing through maintenance-free set of stainless steel disc springs. Secondary seal (= EBRO safety seal) is safely achieved through a matched combination of a PTFE-Chevron seal and an additional O-ring.