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2. Nozzle and flapper - Wikipedia

   en.wikipedia.org/wiki/Nozzle_and_flapper

   The "live" zero of 0.2 bar or 3 psi is set by the bias spring which ensures that the device is working in its linear region. The industry standard ranges of either 3-15 psi (USA), or 0.2 - 1.0 bar (metric), is normally used in pneumatic PID controllers, valve positioning servomechanisms and force balance transducers.

3. Check valve - Wikipedia

   en.wikipedia.org/wiki/Check_valve

   A check valve, non-return valve, reflux valve, retention valve, foot valve, or one-way valve is a valve that normally allows fluid (liquid or gas) to flow through it in only one direction. [1] Check valves are two-port valves, meaning they have two openings in the body, one for fluid to enter and the other for fluid to leave. There are various ...

4. Propane, butane, and LPG container valve connections

   en.wikipedia.org/wiki/Propane,_butane,_and_LPG...

   Several types of valve connections for propane, butane, and LPG containers exist for transport and storage, sometimes with overlapping usage and applications, and there are major differences in usage between different countries. Even within a single country more than one type can be in use for a specific application.

5. Downhole safety valve - Wikipedia

   en.wikipedia.org/wiki/Downhole_safety_valve

   This movement compresses a large spring and pushes the flapper downwards to open the valve. When hydraulic pressure is removed, the spring pushes the sleeve back up and causes the flapper to shut. In this way, it is failsafe and will isolate the wellbore in the event of a loss of the wellhead .

6. Flush toilet - Wikipedia

   en.wikipedia.org/wiki/Flush_toilet

   In North America, newer toilets have a 3 in (76 mm) flapper-flush valve. Older toilets have a 2 in (51 mm) flapper-flush valve. [7] The larger flapper-flush valve is used on toilets that use less water, such as 1.6 US gal (6.1 L) per flush. Some have a bell inlet for a faster more effective flush.

7. Ballcock - Wikipedia

   en.wikipedia.org/wiki/Ballcock

   As the tank water level drops, the float descends and actuates the fill valve. Water is fed to the tank to replenish its supply, and a smaller flow is directed into the overflow tube to refill the bowl. Once the flapper valve closes, the water flow from the fill valve continues until the tank level again reaches the fill line.