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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.

4. Engine braking - Wikipedia

   en.wikipedia.org/wiki/Engine_braking

   A compression release brake (also known as a Jacobs brake or "jake brake"), is the type of brake most commonly confused with real engine braking; it is used mainly in large diesel trucks and works by opening the exhaust valves at the top of the compression stroke, so the large amount of energy stored in that compressed air is not returned to ...

5. Railway air brake - Wikipedia

   en.wikipedia.org/wiki/Railway_air_brake

   Piping diagram from 1909 of a Westinghouse 6-ET Air Brake system on a locomotive Control handle and valve for a Westinghouse air brake. A railway air brake is a railway brake power braking system with compressed air as the operating medium. [1]

6. Hydraulic brake - Wikipedia

   en.wikipedia.org/wiki/Hydraulic_brake

   The driver's brake pedal simply controls a valve to bleed pressure into the brake units at the wheels, rather than actually creating the pressure in a master cylinder by depressing a piston. This form of brake is analogous to an air brake system but with hydraulic fluid as the working medium rather than air. However, on an air brake air is ...

7. Compression release engine brake - Wikipedia

   en.wikipedia.org/wiki/Compression_release_engine...

   The typical compression brake consists of a hydraulic system using engine oil which transfers the motion of the fuel injector rocker arm to the engine's exhaust valve(s). When activated, the exhaust valve opens very briefly near the engine's top dead center , and releases the compressed air in the cylinder so that the air compression energy is ...