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The basic working principle of an air-operated double diaphragm pump. Cross-section sketch of diaphragm fuel pump Air-operated double diaphragm pump. A diaphragm pump (also known as a Membrane pump) is a positive displacement pump that uses a combination of the reciprocating action of a rubber, thermoplastic or teflon diaphragm and suitable valves on either side of the diaphragm (check valve ...
Ancillaries were at the ends of the engine. A spring starter was at the front of the engine, together with a diaphragm fuel pump and a three-chamber gear pump. This pumped engine lubricating oil, seawater coolant and also provided a bilge pump for the lifeboat. [6]
Fuel pumps are constructed such that if their diaphragm ruptures, the excess fuel will be directed into the carburettor. [6] Carburetors do not allow overflow into the boat engine compartment. [7] Spark arrestor are installed on the engine's air intake (carburetor or electronic fuel injector).
In mechanics, a diaphragm is a sheet of a semi-flexible material anchored at its periphery and most often round in shape. It serves either as a barrier between two chambers, moving slightly up into one chamber or down into the other depending on differences in pressure , or as a device that vibrates when certain frequencies are applied to it.
A Fuel pump is a component used in many liquid-fuelled engines (such as petrol/gasoline or diesel engines) to transfer the fuel from the fuel tank to the device where it is mixed with the intake air (such as the carburetor or fuel injector).
Diaphragm pumps have the advantage that they pump relatively lightly due to the lack of pulling rods and are corrosion resistant. Their disadvantage is that they need a specific length of tubing and high quality rubber diaphragms, which are costly and are relatively inefficient due to the extra work needed to deform the diaphragm.
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