D&T Online: Pneumatics information

`Pneumatics: 5/2 valve`
	`The 5/2 valve is used to control items such as double acting cylinders which have two inputs. The inputs to the cylinder are connected to ports 2 and 4, the air supply to port 1. Ports 3 and 5 are allowed to exhaust to atmosphere. The number 5 signifies that the valve has five ports, whilst the number 2 signifies that the valve has 2 directions or states.`