There is a large range of control valves for gas mainly for items such as cookers and high maintenance vehicles. It is used to adjust how much gas a particular item uses for a cooker you don't want a high amount of gas entering the system or food will burn. The image is a shut of valve it is a rely common type of shut of valve, it is used to make a fast flowing system such as a shower tap off instantly.
This is a pneumatic actuator it is used to covert energy into mechanical motion, its used to convert energy into vacuum or compressed air. Pneumatic energy has a use for main engine controls as it can quickly respond in starting and stopping power going to the motor/motors. The early time of pneumatic technology the actuators that were commonly available were cylinders this provided a simple movement.
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