Hydraulic Elevator Systems
The vast majority of today’s elevators are one of two basic designs‚ traction or hydraulic. Hydraulic type systems are typically less expensive to install and are utilized in buildings that have a maximum of six or seven floors. The hydraulic portion of the hydraulic elevator system consists of various components including one or more hydraulic cylinders‚ an electronically controlled valve‚ an oil reservoir and one or more positive displacement pumps. Typically‚ the rotary‚ three screw pump is the pump of choice. This pump design is preferred due to it’s inherit quite and smooth operation and high reliability. The pump can be installed either within the oil reservoir driven directly by an oil cooled electric motor‚ or the pump can be installed beneath the reservoir‚ driven by an electric motor through a series of belts and pulleys. In either installation configuration‚ the pumping unit will deliver years of uninterrupted service‚ requiring only minor‚ periodic maintenance.
Three screw pumps:
| Series | Flow Range (gpm) | Maximum Pressure on Discharge (psi) |
|---|---|---|
| 4 PIC (Submersible) | Up to 240 gpm | 1‚000 |
| 3D | Up to 450 gpm | 500 |
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