Classroom on demand

Welcome to Classroom on demand, your source for educational materials related to the vertical transportation industry. This site represents the knowledge and expertise of the best engineers and mechanics in the elevator industry, and will help those new to the elevator industry learn about the basic workings of elevator systems, and also will serve as a reference for people with more experience.

Dry Pump Unit

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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