hydraulic pipe fittings are connected to the pipe line parts. Depending on the connection method can be divided into socket type fittings, threaded pipe fittings, flanges and welded pipe fittings four categories. Multi-tube made ​​of the same material. There elbows banjo hydraulic fittings, flanges, tees, crosses tube (Phillips) and diameter pipe (size of the head) and so on. Place for pipe elbow turn; flange for tube and pipe interconnected parts, connected to the pipe end, tee pipe together for three places; Stone pipes tubes together for four places; different two hydraulic hose manufacturersof different diameters diameter pipe connected to the place. Steel pipe fittings are pressure pipe fittings. Depending on the process, divided into four categories, namely butt weld pipe fittings category (points have no weld seam and two), socket welding and threaded pipe fittings, flanges, pipe fittings. The effect of the hydraulic system is increased by changing the pressure force. A complete hydraulic system consists of five parts, namely, power components, actuators, control components and auxiliary components (Annex) and hydraulic oil.