Sanitary Valves

sanitary
free from filth and pathogens; "sanitary conditions for preparing food"; "a sanitary washroom"
(Sanitaries) or sannies: White tube socks worn underneath baseball stirrups. Baseball teams originally wore solid-colored stockings, but fabric dyes weren’t colorfast in those days, so a player who was spiked could get blood poisoning if dye from the stocking got in the wound.
Hygienic and clean
Of or relating to the conditions that affect hygiene and health, esp. the supply of sewage facilities and clean drinking water
A state of cleanliness where the microbial and wild yeast and bacterial count on the surface of an item is reduced to a level considered safe for brewing. This is achieved by soaking items in a solution of sanitizing agent. See sterile.

valves
(valve) control consisting of a mechanical device for controlling the flow of a fluid
(valve) a structure in a hollow organ (like the heart) with a flap to insure one-way flow of fluid through it
(valve) device in a brass wind instrument for varying the length of the air column to alter the pitch of a tone
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
A device for controlling the passage of fluid through a pipe or duct, esp. an automatic device allowing movement in one direction only
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