The valve guide piston is fitted in a bush and is equipped with a number of seal rings.Ī store spring keeps the valve firmly seated. The control piston is screwed with the extension of the valve spindle. The miter faced valve is carried at one end of the spindle, and the other end is provided with the guide piston. The valve chest is made out of a steel casing. The housing for the valve is integrally cast with the lower part of the two piece cylinder cover. These cams have been adjusted for their opening times in such a manner, so as to ensure overlapping for consecutive cylinders for a certain time period, based on the firing order of the engineĮach cylinder is equipped with a starting valve fitted at the lateral side of the cylinder cover.
Each air admittance valve is equipped with its own distributor and Ahead-Astern cam. The air starting valve is operated by pressurised air from the air bottle.
#Keeney air admittance valve reviews full
Just take a close look at the picture given below which shows the full constructional details of the valve before proceeding to study further. In this article we will take a look at the construction and working principle behind these air admittance valves. Their main function is to admit the starting air into the cylinder for starting the engine by air and closes when the engine picks up speed and starts running on fuel oil. Starting air admittance valves or air starting valves are provided in the cylinder head mountings of marine diesel engines. But how do you turn the gigantic engine like that of a ship’s main propulsion plant? The answer lies in the use of compressed air for starting the engine, hence it is also known as the starting air. What do you do when you want to start your car or bike? Well you simply turn your ignition key and the battery of the vehicle turns the engine with the help of a starting motor and the firing process starts which continues till the engine is able to run on its own, of course this process takes very short time.
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