This is one of the newer plastics perhaps better known by its trade name of Derlin. I has been developed as a material for mechanical parts including sprinkler nozzles , handles , gears, housings etc., At present this is widely used for stereo tape catridges, toys , furniture casters and cigarette lighter cases. It has good tensile strength , resistance to temperature (115*C) , low friction characteristics, resistance to most solvent and low moisture absorption.
Steam Pressure at inlet to a steam turbine is reduced by throttling process to maintain the speed of the turbine constant at part load and hence this method of governing is called "Throttle Governing". Construction : Throttle governing system consists of a centrifugal governor, a lever , an oil pump , a pilot piston , control valve , a relay piston and a throttle valve. The throttle valve is moved by a relay piston. The relay piston is actuated by pilot piston control valve. There are two piston valves covering ports in the pilot piston control valve without any overlap. These piston valves are operated by lubricating oil supplied by a gear pump at 2 to 4 bar. The oil returns to the drain from this chamber. Working : When the turbine works on full rated load, the throttle valve will remain open. When the load is decreased, the energy output of the turbine becomes in excess and the turbine shaft speed increases. Hence, governor sleeve will lift. The upward movement of the
Comments
Post a Comment