Diaphragm Actuated Valve

diaphragm
a mechanical device in a camera that controls size of aperture of the lens; "the new cameras adjust the diaphragm automatically"
(anatomy) a muscular partition separating the abdominal and thoracic cavities; functions in respiration
a contraceptive device consisting of a flexible dome-shaped cup made of rubber or plastic; it is filled with spermicide and fitted over the uterine cervix
A thin sheet of material forming a partition
A taut, flexible membrane in mechanical or acoustic systems
A dome-shaped, muscular partition separating the thorax from the abdomen in mammals. It plays a major role in breathing, as its contraction increases the volume of the thorax and so inflates the lungs

actuated
moved to action; "a man actuated by unworthy desired"
Cause (someone) to act in a particular way; motivate
Cause (a machine or device) to operate
(actuate) trip: put in motion or move to act; "trigger a reaction"; "actuate the circuits"
(actuate) motivate: give an incentive for action; "This moved me to sacrifice my career"

valve
A cylindrical mechanism in a brass instrument that, when depressed or turned, admits air into different sections of tubing and so extends the range of available notes
A membranous fold in a hollow organ or tubular structure, such as a blood vessel or the digestive tract, that maintains the flow of the contents in one direction by closing in response to any pressure from reverse flow
control consisting of a mechanical device for controlling the flow of a fluid
A device for controlling the passage of fluid through a pipe or duct, esp. an automatic device allowing movement in one direction only
device in a brass wind instrument for varying the length of the air column to alter the pitch of a tone
a structure in a hollow organ (like the heart) with a flap to insure one-way flow of fluid through it