Hydraulic unit consists of the hydraulic tank, electromotor, pressure control valves, debi, direction and other equipments mounted on it to provide Debi, pressure control and current direction. This collection is also called power pack and power unit. The amount of oil container is determined according to the system requirements pump’s Debi and heat transfer parameters. In this company, the usual volume of the container is thirty to two thousands liters. The size of required electromotor is determined based on the system’s required pressure and Debi. Usual power of single-phase electromotor is up to two point tow kilowatt and three-phase one up to one hundred and sixty kilowatt. Valves, pumps and electromotor are arranged on the oil container according to the system’s designed circuit and mounting limitations.
Hydraulic jack is a hydraulic cylinder that works in a single direction and usually has high capacity. Instead of piston, a thick rod with a shoulder or a small step at its end is used in jacks. This shoulder prevents the rod from coming out of the cylinder chamber completely. Desired cylinders are selected according to the cylinder diameter of 40 to 200 mm and course length up to six thousands mm.