This invention is an apparatus which is permitted to the spindle (7) movement limited turning with only 90° angle on the ball valves which has 180° turning speciality (bi-flow) (figure 8 and figure 14). Aforesaid this apparatus is consisted of blocking part (8) and ring clamp (9). The blocking part (8) is permitted the spindle movement 90° instead of 180° which is assembled to the spindle (7). The blocking part (8) taking off is prevented by fixing a ring clamp (9).
