| 11. | Engine and chain-drive lubrication used a total-loss oil system, controlled by a small pump and needle valve.
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| 12. | The needle valve is controlled by an aneroid bellows, causing a leaning of the mixture as altitude increases.
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| 13. | Two main types are used : the fixed orifice and the adjustable orifice ( usually a needle valve ).
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| 14. | After donning safety glasses and hearing protection a check is made to ensure the needle valve is fully closed.
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| 15. | From there the tube runs to a needle valve that controls the amount of gas flowing to the balloon.
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| 16. | In 1957, the Spanish company started producing gate valves, check valves, needle valves and butterfly valves for the marine industry.
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| 17. | The solenoid lifts the needle valve from the valve seat, and fuel under pressure is sent in the engine cylinder.
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| 18. | A true needle valve uses a tapered needle in a tapered seat, so as to provide fine control over flow rate.
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| 19. | It operates by bleeding higher pressure air from chamber B into chamber A as it flows though a tapered needle valve.
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| 20. | The needle valve is controlled by an aneroid bellows that senses barometric pressure, causing a leaning of the mixture as altitude increases.
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