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2. Plug valve - Wikipedia

   en.wikipedia.org/wiki/Plug_valve

   Super duplex plug valve. Plug valves are valves with cylindrical or conically tapered "plugs" which can be rotated inside the valve body to control flow through the valve. The plugs in plug valves have one or more hollow passageways going sideways through the plug, so that fluid can flow through the plug when the valve is open. Plug valves are ...

3. Spark plug - Wikipedia

   en.wikipedia.org/wiki/Spark_plug

   Spark plug with single side electrode An electric spark on the spark plug. A spark plug (sometimes, in British English, a sparking plug, [1] and, colloquially, a plug) is a device for delivering electric current from an ignition system to the combustion chamber of a spark-ignition engine to ignite the compressed fuel/air mixture by an electric spark, while containing combustion pressure within ...

4. Fusible plug - Wikipedia

   en.wikipedia.org/wiki/Fusible_plug

   A fusible plug operates as a safety valve when dangerous temperatures, rather than dangerous pressures, are reached in a closed vessel. In steam boilers the fusible plug is screwed into the crown sheet (the top plate) of the firebox , typically extending about 1 in (25 mm) into the water space above it.

5. Subaru EJ engine - Wikipedia

   en.wikipedia.org/wiki/Subaru_EJ_engine

   These engines can be identified by smooth valve covers, plug leads and a wasted spark coil in the middle of the intake manifold. ... Engine Weight: 265 lb (120 kg ...

6. Piping and plumbing fitting - Wikipedia

   en.wikipedia.org/wiki/Piping_and_plumbing_fitting

   Non-return or check valves allow the free flow of a fluid in one direction but prevent its flow in a reverse direction. They are often seen in drainage or sewage systems but may also be used in pressurized systems. Valves are available in several types, based on design and purpose: Gate, plug, or ball valves – Isolation; Globe valve ...

7. Tremie - Wikipedia

   en.wikipedia.org/wiki/Tremie

   It may have a loose plug or a valve at the bottom end. A tremie is usually used to pour concrete underwater in a way that avoids washout of cement from the mix due to turbulent water contact with the concrete while it is flowing. This produces a more reliable strength of the product. [2] Common applications include: