HYDRAULIC PUMPS - WHAT DETERMINES THE TYPE OF PUMP • Flow Required • RPM's the Pump will operate • Hydraulic System Pressure Requirement • Type of Hydraulic Valve [Open or Closed] • Budget / Hours of Operation • When full flow is not required, variable volume piston pumps are more attractive Least Most. Expensive. Gear. Vane In a hydraulic system, fluid powerprovides the "muscles" or power to do work, while a controlpart provides the "brain" to command system operation. Control of a hydraulic system may range from the simple starting and stopping of the system to controlling extension and retraction of several cylinders in a completely automated factory. Pump operating Relief Pressure Hydraulic system efficiency Open and closed center hydraulic systems Open center a truck-mounted, or mobile, hydraulic system operates, what components make up the system, how they work, and why they sometimes fail to perform as expected. Our frame of reference is that of a leading manufacturer and Download full-text PDF Read full-text Abstract Hydraulic systems in aircraft provide a means for the operation of aircraft components. The operation of landing gear, flaps, flight control surfaces, Hydraulic system maintenance is just as important, and directly related to, hydraulic oil maintenance. All the filtering and analysis done on a hydraulic oil would be meaningless and futile if the system itself is in a shambles. A 10 Point Check — A lubrication technician or operator responsible for hydraulic system maintenance should, at Figure 1-1 A Basic Hydraulic System Regardless of the industry or the application, if you are involved in the maintenance of hydraulic equipment or systems, it is very important that you have an understanding of how the components in the systems operate and the hydraulic principles that make them function Hydraulic Systems and Components Reynolds Number v: flow velocity (m/s) d: Pipe diameter (m) ν: Kinematic viscosity (m2s-1) Laminar Vs Turbulent Flow Laminar flow fluid moves through pipe in ordered cylindrical layers In turbulent flow the fluid ceases to flow in ordered layers and form eddies Laminar flow : Re<2300 Turbulent flow : Re<2300 2 Understand the purpose and operation of hydraulic power supply systems and their associated components Hydraulic power supply systems: purpose and operation of a power supply system eg power source (such as hand pump, fixed and variable displacement engine driven pumps (vane or piston), electric pumps, 6.1 Comparison of Hydraulic & Pneumatic Circuits Hydraulic Circuits Pneumatic Circuits 8. Its operating pressure can be lower to very high 8. Its operating pressure is limited to 6 bar 9. In this the system rigidity is good 9. In this system rigidity is poor 10. It has simple maintenance 10. It also has simple maintenance 11. 1. Oil Maintenance. Keep a consistent schedule for checking the condition of your hydraulic fluid. It needs to remain clean and free of any contaminants. You can help minimize the risk of contamination by keeping the area around entry points, like dipsticks and fuel plugs, clear of dust and debris. Hydraulic systems are used for transmission of power through the medium of hydraulic oil. The hydraulic system works on the principle of Pascal's law which says that ―thepressure in a fluid at rest is transmitteduniformly in all directions‖. The fluid medium used is hydraulic oil,