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2. Check valve - Wikipedia

   en.wikipedia.org/wiki/Check_valve

   Tilting-disc inconel check valve Check valve symbol on piping and instrumentation diagrams. The arrow shows the flow direction. Vertical lift 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]

3. Piping and plumbing fitting - Wikipedia

   en.wikipedia.org/wiki/Piping_and_plumbing_fitting

   Fittings allow multiple pipes to be connected to cover longer distances, increase or decrease the size of the pipe or tube, or extend a network by branching, and make possible more complex systems than could be achieved with only individual pipes. Valves are specialized fittings that permit regulating the flow of fluid within a plumbing system.

4. Quick connect fitting - Wikipedia

   en.wikipedia.org/wiki/Quick_connect_fitting

   For hoses and piping, a quick connect fitting, also called a push fitting, is a coupling used to provide a fast, make-or-break connection of gas or liquid transfer lines. Operated by hand, quick connect fittings replace threaded or flanged connections, which require wrenches. When equipped with self-sealing valves, quick connect fittings will ...

5. Propane, butane, and LPG container valve connections

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

   1" No thread Quick coupling 24.5 mm (G.55) EN 15202 24.5 mm 1" No thread Quick coupling 24.5 mm (G.60) EN 15202 25.4 mm 1" No thread Quick coupling 27 mm (G.59) EN 15202 27 mm 1.063" No thread Quick coupling 35 mm Jumbo (G.56) EN 15202 35 mm 1.378" No thread Quick coupling bayonet (G.61) EN 15202 No thread Quick Coupling Fork Lift (G.66)

6. Compression fitting - Wikipedia

   en.wikipedia.org/wiki/Compression_fitting

   A compression fitting 15 mm isolating valve. A compression fitting is a fitting used in plumbing and electrical conduit systems to join two tubes or thin-walled pipes together. . In instances where two pipes made of dissimilar materials are to be joined (most commonly PVC and copper), the fittings will be made of one or more compatible materials appropriate for the connect

7. Coupling (piping) - Wikipedia

   en.wikipedia.org/wiki/Coupling_(piping)

   A coupling whose ends use the same connection method but are of different sizes is called a reducing coupling or reducer. An example is a 3/4" NPT to 1/2" NPT coupling. An example is a 3/4" NPT to 1/2" NPT coupling.