ELT 793 - Advanced Fluid Power

1. Demonstrate knowledge of pressure compensated pumps on a written test
   1. Identify parts on a pressure compensated axial pump
   2. Identify parts on a pressure compensated redial pump
   3. Adjust pressure on a pressure compensated pump
   4. Describe operation of a pressure compensated pump
2. Demonstrate knowledge of pressure compensated control valves on a written test
   1. Demonstrate the understanding of basic system schematics by color coding circuits
   2. Describe the operation of a pressure compensated flow control valve
   3. Explain the advantages of using pressure compensated flow control valves.
   4. Explain the purpose of a pressure reducing valve
   5. Demonstrate in the laboratory how a pressure reducing valve functions
3. Demonstrate knowledge of priority valves, and make-up valves on a written test
   1. Explain a simple flow control valve
   2. Disassemble and identify parts on a simple flow control valve
   3. Explain a complex flow control valve
   4. Disassemble and identify parts on a complex flow control valve
   5. Explain the operation of a make-up valve
   6. Disassemble and identify the parts in a make-up valve
4. Demonstrate knowledge of the signal network used in pressure compensated systems on a written test
   1. Explain the purpose of a double check valve (RESOLVER) services in the system
   2. Describe the purpose of primary and secondary resolvers
   3. Disassemble an individual valve in the lab and identify the parts and check for wear
   4. Explain oil flow through the valve
   5. Explain the purpose of an advanced signal passage found in the main control valve
   6. Describe how a signal pressure limiter functions
5. Describe AC and DC control of systems
   1. Causes of solenoid coi8l failures
   2. Explain how sticking valve spools can burn out solenoid coils
   3. Explain valve logic systems
   4. Explain how counter-electromotive Force (EMF) from solenoids can destroy control circuitry
   5. Explain how solenoids can be controlled by switches, relays, thyristors and other electronic devices
   6. Explain how valves can be controlled by programmable logic controllers (PLCs).
6. Describe electrical measurement of pressure and flow
   1. Describe how a Wheatstone bridge pressure transducer works
   2. Describe how a Wheatstone bridge flow control sensor works
   3. Explain how to calibrate pressure and flow control sensors
   4. Explain when temperature compensated sensors are needed
7. Be able to correctly select and substitute hydraulic fluids
   1. Define tribology
   2. Describe where different viscosities are used in fluid power
   3. Define aniline point and how it affects hydraulic seals
   4. Lists oil types than can and cannot be used with hydraulic systems that use bronze parts
8. Describe the operation of the following fluid power systems
   1. Air counterbalance systems on a modern stamping press
   2. Load sensing/pressure compensated hydraulic system of modern construction/excavating machinery
   3. Modern high speed hydraulic stamping press
   4. Hydraulic table style surface grinders