Page 1 Page 2 Page 3 Page 4 Page 5 Page 6 Page 7 Page 8 Page 9 Page 10 Page 11 Page 12 Page 13 Page 14 Page 15 Page 16 Page 17 Page 18 Page 19 Page 20Australian Pipeline Valve - Installation, Operation and Maintenance Manual 10 LINED BUTTERFLY VALVES - MODEL 2014 & 2016 SERIES 5 . 0 O P E R A T I O N 5.1 MANUAL OPERATION Valve adjustments is by clockwise turning of the stem. Lever operated and gear operated valves have a position indicator to indicate open or closed (see Figure 9 & 10). Butterfly valves are not designed to be used for throttling. Do not leave part open, or seats will be damaged. Valves must be full open or full closed. If valves are used to throttle it must be done at very low pressures and for very short periods. As a result of constant throttling, the life of the valve will be shortened. Even then do not throttle unless clean fluids, less than 30% open or more than 70% closed, or venturi action will still cause immediate seat damage. 5.2 LOCK DEVICE Where provided (optional) the valve has a locking hole that allows valve to be locked in full open or full closed position. 5.3 ROUTINE OPERATION It is recommended that the valve be periodically at least partially stroked to ensure the valve functions and will prevent seizure/galvanisation of any mating stem chamber or seat surfaces or memory moulding of the seat. This especially applies to automatic actuated valves which only have a limited amount of torque available to function the valve. Duration depends on service, criticality, etc. However, it also must be factored in that if there are impurities or particulates in the line each operation could reduce seat life proportionately. Packing leakage could result in personal injury. Valve packing is tightened prior to shipping but may require adjustment to meet specific service conditions. FIGURE 9 FIGURE 10