TAILIEUCHUNG - Tài liệu Diezel 1410 P4

Modern submarine diesel engines are started by admitting compressed air into the engine cylinders at a pressure capable of turning over the engine. | 4 ENGINE AIR STARTING SYSTEMS A. GENERAL 4A1. Description. Modern submarine diesel engines are started by admitting compressed air into the engine cylinders at a pressure capable of turning over the engine. This process is continued until the pistons have built up sufficient compression heat to cause combustion. The pressure used in air starting systems is approximately from 250 to 500 psi. 4A2. Source of starting air. Starting air comes directly from the ship s high-pressure air service line in which pressures up to 3 000 psi are normally maintained or from starting air flasks which are included in some systems for the purpose of storing starting air. In either instance the air on the way to the engine must pass through a pressure reducing valve which reduces the higher pressure to the operating pressure required to start a particular engine. A relief valve is installed in the line between the reducing valve and the engine. This relief valve is normally set to open at 25 to 50 pounds in excess of the air starting pressure. Thus if the air pressure leaving the reducing valve is too high the relief valve will protect the engine by releasing air in excess of the value for which it is set and permit only air at approximately the proper pressure to reach the engine cylinders. Figure 4-1. Typical starting air piping system. 81 Figure 4-2. Grove regulator valve. 4A3. Pressure regulating valve. The pressure reducing valve is a Grove regulator Figure 4-2 in which compressed air sealed in a dome furnishes the regulating pressure that actuates the valve. Thus the compressed air in the dome performs the same function as a spring used in a conventional type of valve. The dome is tightly secured to the valve body which is separated into an upper low pressure outlet and a lower high-pressure inlet chamber by the main valve. At the top of the valve stem is another chamber which contains a rubber diaphragm and a metal diaphragm plate. This chamber has an opening leading to the .

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