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2. Shutdown valve - Wikipedia

   en.wikipedia.org/wiki/Shutdown_valve

   A shutdown valve (also referred to as SDV or emergency shutdown valve, ESV, ESD, or ESDV; or safety shutoff valve) is an actuated valve designed to stop the flow of a hazardous fluid upon the detection of a dangerous event.

3. List of valves - Wikipedia

   en.wikipedia.org/wiki/List_of_valves

   The inside of an extremely large butterfly valve Duplex ball valve Three check valves in corrosion-resistant Hastelloy Stainless steel gate valve. Valves can be categorized into the following types, based on their operating mechanism:

4. North American Fire Hose Coupler Incompatibilities - Wikipedia

   en.wikipedia.org/wiki/North_American_Fire_Hose...

   Despite fire hose and hydrant coupler standardization efforts that are at least 144 years old, [1] there remain significant areas in Canada, the United States, and Mexico that use fire hose and hydrant threads and other couplings that are incompatible with those used by neighboring fire departments.

5. Glossary of firefighting equipment - Wikipedia

   en.wikipedia.org/wiki/Glossary_of_firefighting...

   Adapter Fitting for connecting hose couplings with dissimilar threads but with the same inside diameter. [1] See also reducer, increaser, double male, double female.May contain combinations, such as a double-female reducer.

6. 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.

7. Gate valve - Wikipedia

   en.wikipedia.org/wiki/Gate_valve

   Gate valves are used to shut off the flow of liquids rather than for flow regulation, which is frequently done with a globe valve.When fully open, the typical gate valve has no obstruction in the flow path, resulting in very low flow resistance. [1]