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How does a Dry unit work on a Thyssenkrupp elevator

How does a Dry unit work on a Thyssenkrupp elevator

Engineering   Mechanical-Engineering   
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A dry power unit is assembled with the pump, motor, control valve, and silencer underneath the tank. The tank is purely an oil reservoir. This is why they are called dry power units. The motor, in conjunction with sheaves and belts, drives the dry pump. The pump speed, or GPM, can be altered by changing the RPM of the pump. The RPM is changed by modifying the size of the sheaves. This means that one pump size can be used for a range of contract speeds, simply by varying the sheaves.

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