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2. 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 ...

3. Double check valve - Wikipedia

   en.wikipedia.org/wiki/Double_check_valve

   A double check valve or double check assembly (DCA) is a backflow prevention device designed to protect water supplies from contamination. [1] It is different from the two-way check valves (sometimes erroneously referred to as double check valves) used in air brake systems on heavy trucks which select from the highest pressure source. It ...

4. List of valves - Wikipedia

   en.wikipedia.org/wiki/List_of_valves

   Choke valve, Butterfly valve used to limit air intake in internal combustion engine. (Not to be confused with choke valves used in industrial flow control, above.) Clapper valve: a type of check valve used in the Siamese fire appliance to allow only one hose to be connected instead of two (the clapper valve blocks the other side from leaking out)

5. Valve - Wikipedia

   en.wikipedia.org/wiki/Valve

   Depending on the type of valve, a disc can move linearly inside a valve, or rotate on the stem (as in a butterfly valve), or rotate on a hinge or trunnion (as in a check valve). A ball is a round valve member with one or more paths between ports passing through it.

6. USATC S160 Class - Wikipedia

   en.wikipedia.org/wiki/USATC_S160_Class

   Italy, FS Class 736 – 244 examples, plus four salvaged from a sunken ship, all but eight with oil firing. 25 sold to Greece in 1959, the rest were withdrawn in early 1960s Poland , PKP Class Tr201 – PKP received 75 S160s from UNRRA and numbered them Tr201-1 through 75; a further 500 arrived from the USATC as class Tr203 , numbered Tr203-1 ...

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