Elevators are classified by control
The handle switch is used to operate the elevator, allowing the driver to control the car's movement by adjusting the control panel's handle. This enables the elevator to start, rise, descend, level, and stop smoothly.
Button-controlled elevators are a basic type of automatic system that includes automatic leveling. They typically feature two main control modes: one where passengers press buttons inside the car, and another where buttons are located on the landing floor.
Signal-controlled elevators offer a higher level of automation, allowing the driver to manage multiple functions such as automatic leveling, door opening, car call registration, landing call registration, and automatic stopping. These systems also support forward and reverse operations, making them more efficient than simpler models.
Collective control elevators build upon signal control by introducing full automation. Unlike traditional signal-controlled systems, they can operate without a driver, making them ideal for high-traffic environments like office buildings and shopping centers.
Parallel-controlled elevators involve connecting the control systems of two or three elevators together, allowing them to share the same call buttons outside the building. This setup improves efficiency by optimizing the use of available units.
Group-controlled elevators take automation even further by using microcomputers to coordinate and manage multiple elevators. These systems can be programmed to optimize traffic flow, reduce waiting times, and improve overall performance through intelligent decision-making.
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Flanges are used to connect valves, pipes, pumps and other equipment to make a pipework system. Typically flanges are welded or threaded, and two flanges are connected together by bolting them with gaskets to provide a seal that provides easy access to the piping system
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