In a pressurized system, the fluid flows due to a change in pressure which can be produced by pistons, pumps, etc. The flow is controlled by the pipes along which the fluid flows. At the joints the direction of fluid can be changed with the use of valves. If a pipe splits into two different pipes, valves are located on both the branches. The fluid flows in the pipes which have open valves.
In pressurized fluid systems the pipes have been constructed and joined in a manner that enables them to withstand the high pressures without getting damaged. As pressurized fluids can be highly corrosive, valves should be able to withstand high pressures and strains.