and a bush 30 and a wedge 31 also the tubular piston member 13a contains a female screw piston 23 which slidably connects to a hollow 25 for operatively mating with the male screw 25a of the sprocket 27 bolts 24 connected to the tubular spring and piston members 13a and 14a are fixed the hollow piston 23 for preventing the hollow piston 23 from rotating a movable bar 20 disposed within the hollow piston 23 and male screw 25 connects to a push bar 18 which connects to the control valve 9 by a bolt 19 a coil spring 21 is wound around the push bar 18 the push bar 18 includes a raised portion 16 disposed within the flange piston tubular member 13a for fixing one end of the coil spring 21 and for preventing the push bar 18 from moving over to the control valve 9 since the movable bar 20 connects to the push bar 18 at the one end and connects to the male screw 25 at the other end thereof when the sprocket 27 moves backward the control valve 9 moves backward to open the opening of the outlet 1b as shown in fig3 the plurality.