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2. Lapping - Wikipedia

   en.wikipedia.org/wiki/Lapping

   Lapping is a machining process in which two surfaces are rubbed together with an abrasive between them, by hand movement or using a machine. Lapping often follows other subtractive processes with more aggressive material removal as a first step, such as milling and/or grinding .

3. Valve job - Wikipedia

   en.wikipedia.org/wiki/Valve_job

   A valve job is the colloquial term for resurfacing the mating surfaces of the poppet valves and their respective valve seats that control the intake and exhaust of the air/fuel mixture in four stroke internal combustion engine, replacing valve oil seals, replacing any deficient valve springs, and otherwise bringing the components of a cylinder head up to manufacturer’s spec. [1] A ...

4. Poppet valve - Wikipedia

   en.wikipedia.org/wiki/Poppet_valve

   The poppet valve was also used on the American Pennsylvania Railroad's T1 duplex locomotives, although the valves commonly failed because the locomotives were commonly operated in excess of 160 km/h (100 mph), and the valves were not meant for the stresses of such speeds. The poppet valves also gave the locomotive a distinctive "chuffing" sound.

5. Two-stroke power valve system - Wikipedia

   en.wikipedia.org/wiki/Two-stroke_power_valve_system

   A stroke is the action of a piston travelling the full length of its cylinder.In a two-stroke engine, one of the two strokes combines primarily the intake stroke and the combustion stroke, while the other stroke primarily combines the compression stroke and the exhaust stroke, though technically since both ports are exposed during both the combustion and compression strokes, some reversion ...

6. 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]

7. Electro-pneumatic brake system on British railway trains

   en.wikipedia.org/wiki/Electro-pneumatic_brake...

   The first Southern units fitted with EP brake could be considered the Bulleid double deck 4-DDs built 1949 (4001 & 4002). The EP brake fitted to this stock was not of the self lapping type and still required the Westinghouse brake as the 'fail to safe' braking as the EP brake fitted was of the 'energise to apply' type, which meant if there was a loss of brake control voltage the EP brake was ...

8. Valve actuator - Wikipedia

   en.wikipedia.org/wiki/Valve_actuator

   Manually operated valves require someone in attendance to adjust them using a direct or geared mechanism attached to the valve stem. Power-operated actuators, using gas pressure, hydraulic pressure or electricity, allow a valve to be adjusted remotely, or allow rapid operation of large valves. Power-operated valve actuators may be the final ...

9. Four-stroke power valve system - Wikipedia

   en.wikipedia.org/wiki/Four-stroke_power_valve_system

   A four-stroke power valve is a device fitted to four-stroke engines that constantly adjusts the internal diameter of the exhaust system to better suit the speed of the engine. Yamaha was the first to develop such a system, called the Exhaust Ultimate Power Valve (EXUP). [1] It first appeared on the Yamaha FZR EXUP and was later used on many ...