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Technology Hydraulic Elevators – Configuring the Power Unit by Parag Mehta Parag Mehta works for Blain Hydraulics GmbH (Germany) in R&D of control valves for hydraulic elevators. He is a mechanical engineer with more than a decade of experience in engi - neering design and project management. Mehta spe - cializes in computer-aided design. He has published various technical articles on hydraulic elevators and looks after the interests of Blain Hydraulics in the Indian sub-continent. 78 ELEVATOR WORLD India • 4th Quarter 2010 • Summary Hydraulic elevator manufacturers and, especially, companies specializing in building power units are often confronted with difficult choices of component selection. While important aspects like availability of components, price factor, durability and reliability of components occupy selectors most of the time, functional and operational aspects play an equally important role. This article attempts to provide guidelines in component selection and highlights some of the basic and optional characteristics that products used in power units and hydraulic elevators should have in order to deliver optimally. This article also tends to educate those who do not build hydraulic power units or elevators themselves, but source ready solutions, as to what they should be looking at from their suppliers and OEMs. Introduction A hydraulic elevator is powered by a power unit mostly found in the machine room or basement of the building or, sometimes, in the elevator shaft itself. Whichever form the unit may have and how different it may look, it would principally have a tank (oil reservoir), flow control valve, shutoff valve, pump, motor and safety valves in its most basic form (Figure 1). Depending upon the supplier, cylinders may or may not be part of the power unit. In this article, components used in the power unit will be analyzed individually on the basis of selection criteria, functions and requirements per EN 81-2 codes. After reading this, it should also be clear as to why similar products sometimes available from the industrial hydraulic segment should not be used. The Pump, the Heart of the Power Unit Like a human heart that pumps blood through our bodies, a hydraulic pump pumps oil through the hydraulic circuit. As we depend on Continued 1 Motor 6 Strainer 11 Cooler plug 16 Top lid plates 2 Pump 7 Baffle plate 12 Drain plug 17 Cooler return line 3 Silencer 8 Heater 13 Rubber dampers 18 Electric box 4 Valve 9 Breather cap 14 Rubber feet 19 Lifting hook 5 Diffuser 10 Level indicator 15 Gaskets 20 Ball valve Figure 1: Power unit of a hydraulic elevator
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