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  2. Manifold vacuum - Wikipedia

    en.wikipedia.org/wiki/Manifold_vacuum

    Manifold vacuum, or engine vacuum in a petrol engine is the difference in air pressure between the engine's intake manifold and Earth's atmosphere.. Manifold vacuum is an effect of a piston's movement on the induction stroke and the airflow through a throttle in the intake manifold of an engine.

  3. Scavenging (engine) - Wikipedia

    en.wikipedia.org/wiki/Scavenging_(engine)

    These Crossley Otto Scavenging Engines were made possible by the recent change from slide valves to poppet valves, which allowed more flexible control over valve timing events. [1] The closing of the exhaust valve occurred more than 30 degrees later than on earlier engines, giving a long 'overlap' period (when both the intake and exhaust valves ...

  4. Cardiomyopathy - Wikipedia

    en.wikipedia.org/wiki/Cardiomyopathy

    Cardiomyopathy is a group of primary diseases of the heart muscle. [1] Early on there may be few or no symptoms. [1] As the disease worsens, shortness of breath, feeling tired, and swelling of the legs may occur, due to the onset of heart failure. [1]

  5. Railway air brake - Wikipedia

    en.wikipedia.org/wiki/Railway_air_brake

    The triple valves detect an emergency reduction based on the rate of brake pipe pressure reduction. Therefore, as long as a sufficient volume of air can be rapidly vented from the brake pipe, each car's triple valve will cause an emergency brake application.

  6. Safety valve - Wikipedia

    en.wikipedia.org/wiki/Safety_valve

    An oxygen safety relief valve DN250-safety valves. A safety valve is a valve that acts as a fail-safe.An example of safety valve is a pressure relief valve (PRV), which automatically releases a substance from a boiler, pressure vessel, or other system, when the pressure or temperature exceeds preset limits.

  7. Back-fire - Wikipedia

    en.wikipedia.org/wiki/Back-fire

    Additionally, improperly adjusted carburetors that create a lean condition during acceleration can cause the air–fuel mixture to burn so slowly that combustion is still taking place during the exhaust stroke, and even when the intake valve opens. The flame front can then travel up the intake and cause a popback.

  8. Proportioning valve - Wikipedia

    en.wikipedia.org/wiki/Proportioning_valve

    A cross-section of a proportioning safety valve. A proportioning valve is a valve that relies on the laws of fluid pressure to distribute input forces to one or more output lines. Proportioning valves are frequently used in cars and other road vehicles to reduce the brake fluid pressure to the rear brakes. Due to weight distribution during ...

  9. Varicose veins - Wikipedia

    en.wikipedia.org/wiki/Varicose_veins

    Varicose veins have no specific cause. [2] Risk factors include obesity, lack of exercise, leg trauma, and family history of the condition. [3] They also develop more commonly during pregnancy. [3] Occasionally they result from chronic venous insufficiency. [2] Underlying causes include weak or damaged valves in the veins. [1]

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