When jet valve nozzle 1 is diverted to the left, the fluid delivered to the nozzle flows through left channel a to the upper end of servomotor 3, shifting piston 4 downward. Fluid forced out of the lower end of servomotor 3 flows through passage 5 and lifts ball b (up to shackle e). This opens two orifices, c and d, for the fluid. When jet valve nozzle 1 is diverted to the right, the fluid flows through right channel f and connection 7, pressing ball b into its seat. In this case the fluid passes through orifice d to the lower end of servomotor 3, shifting piston 4 upward comparatively slowly. The volume of flow through orifices c and d can be regulated with needle members 6 and 2.
$3623$SHP,Va$