To design the bottle filling system, a valve is required to control the flow of the liquid from the tank to the bottle. Depending on the sensor the valve operates. As shown in Table 7, there are two types of valves. Option one is suitable for our system design because for our design a simple operating valve required to manage the flow of the liquid. option 2 is a good choice but it is used in advanced applications like air compressing applications and hydraulic oils which are not required for our design.