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ELM 5020 - Hydraulics II and III


Clock Hours: 60

Delivery Mode
on-ground

Prerequisites: Hydraulics I

Course Description:
This is an advanced technology training course and a comprehensive maintenance training system for industrial hydraulics. The Explorer II Industrial Hydraulics Training System provides the components and hands-on training required to effectively troubleshoot and repair hydraulics systems used in modern industry. The curriculum focuses on the background, applications and maintenance of hydraulics equipment and begins with the fundamentals of hydraulics, which can be used as either an introduction to the technology or as a review of key principles. Additional sections focus on different types of valves, cylinders and hydraulic devices like hydraulic jacks and regenerative circuits. The units are presented sequentially, with later units clearly dependent upon knowledge gained in earlier units.  Units should not be presented out of order, nor should any unit be skipped.

Student Learning Outcomes:
Directional Control Valves: Theory and Purpose                          

Describe the function of directional control valves.

Explain the operation of directional control valves.

Identify the types of directional controls which are available.

Manual Spool Type Directional Control Valves                    

  1. Describe the operation of a manual directional control valve.
  2. Explain the functions of a manual directional control valve.
  3. Identify applications for manual directional control valves.
  4. Install and operate a manual directional control valve in a simple hydraulic circuit.

Solenoid Actuated Spool Type Direct. Control Valves       

  1. Describe the operation of a solenoid directional control valve actuator.
  2. Identify types of failures which can occur in a solenoid actuated directional control valve.
  3. List uses for a solenoid actuated spool type directional control valve.
  4. Install and operate a solenoid actuated valve.

Check Valves: Theory and Purpose                   

Identify the different types of check valves.

Describe basic applications for each type of check valve.

Explain the operation of each type of check valve.

Simple Check Valves

  1. Describe the operation of a simple check valve.
  2. Explain the operational advantages of simple check valves.
  3. Identify applications for simple check valves.
  4. Install and operate a simple check valve in a hydraulic circuit.                                                                            

Pilot Operated Check Valves            

  1. Describe the operation of a pilot operated check valve.
  2. Explain the differences between piloted and simple check valves.
  3. Identify applications for pilot operated check valves.
  4. Install and operate a piloted check valve in a hydraulic circuit.

Flow Control Valves: Theory and Purpose                           

  1. Explain the purpose of flow control devices.
  2. Describe different types of flow controls.
  3. Describe the various adjustment mechanisms used on flow controls.

Needle Valves                      

  1. Describe the function of a needle valve.
  2. Explain the operation of a needle valve.
  3. Identify applications for needle valves.
  4. Install and operate a needle valve in a hydraulic circuit.

Pressure Compensated Flow Control Valves                   

  1.  Describe the function of a pressure compensated flow control valve.
  2. Explain the operation of the pressure compensator in the valve.
  3. Identify typical applications for pressure compensated flow control valves.
  4. Install and operate a pressure compensated flow control valve in a hydraulic circuit.

Non-Pressure Compensated Flow Control Valves             

  1. Describe the function of non-pressure compensated flow control valves.
  2. Explain the operation of non-pressure compensated valves.
  3. Install and operate a non-pressure compensated flow control valve in a hydraulic circuit.

Hydraulic Cylinders: Theory and Purpose         

  1. Identify the basic types of hydraulic cylinders.
  2. Describe the principles of cylinder design.
  3. Explain cylinder operation.
  4. Describe cylinder ratings.

Double Acting Cylinders                   

  1. Explain the operation of a double acting cylinder.
  2. Describe typical applications for a double acting cylinder.
  3. Install and operate a double acting cylinder in a simple hydraulic circuit.

Speed/Area Relationship in a Cylinder                      

  1. Describe the relationship between the effective area of a cylinder and the speed of a cylinder.
  2. Compare the speeds of two cylinders of known bore size.

Force/Area Relationship in a Cylinder          

  1. Explain the relationship between force and area in hydraulic cylinders.
  2. Compare the force of two cylinders of known areas.

Rotary Actuators: Theory and Purpose              

  1. Identify different types of hydraulic rotary actuators.
  2. Describe the operation of a rotary actuator.
  3. Define the term “torque rating.”
  4. Identify applications for rotary actuators.                                        

Fluid Filters      

  1. Describe the function of fluid filters.
  2. Explain the operation of each type of a fluid filter.
  3. Identify the consequences of inadequate fluid filtration.

Piping Considerations and Components                               

  1. Describe the different types of piping components available.
  2. Determine which type of piping should be used for a given application.

Maintenance and Troubleshooting                      

  1. Explain the importance of hydraulic system maintenance.
  2. Assemble maintenance files on a hydraulic system.
  3. Create a logical plan for troubleshooting a system.

Cylinders in Series                    

  1.  Describe the operating characteristics of two hydraulic cylinders in a series circuit.
  2. Install and operate two hydraulic cylinders in a series circuit.

Hydraulic Lock Out              

  1. Explain the function of a hydraulic lock out circuit.
  2. Construct a hydraulic lock out circuit.                      

Dual Speed Control          

  1. Describe the basic principles of dual speed control.
  2. Install and operate dual speed controls in a double acting cylinder circuit.

Pump Unloading                   

  1. Describe the function of a pump unloading circuit.
  2. Construct a circuit to unload a pump when a machine is not operating.

Cylinders in Parallel                      

  1. Describe the function of cylinders connected in parallel.
  2. Construct and operate a circuit with cylinders in parallel.

Hydraulic Jack                

  1. Describe the function of a hydraulic jack type circuit.
  2. Build and operate a hydraulic jack type circuit.

Regenerative Circuit              

  1. Explain the function of a regenerative circuit.
  2. Describe the operation of a regenerative circuit.
  3. Construct and operate a basic regenerative circuit.  

Dual Pressure Control      

  1. Explain the function of dual pressure control.
  2. Describe the use of a reducing valve in dual pressure control.
  3. Construct and operate a circuit using dual pressure control.

Sequencing Circuits                                

  1. Explain the function of a sequencing circuit.
  2. Describe the use of a sequence valve in a sequencing circuit.
  3. Build and operate a sequencing circuit.

Meter-In Speed Control                      

  1. Explain the principles of meter-in speed control.
  2. Describe applications for meter-in speed control.
  3. Explain the limitations of meter-in speed control.
  4. Construct and operate a meter-in speed control hydraulic circuit.

Meter-Out Speed Control                    

  1. Explain the function of meter-out speed control.
  2. Describe applications for meter-out speed control.
  3. Build and operate a meter-out speed control hydraulic circuit.

Bleed-off Circuit Speed Control              

  1. Describe the operation of a bleed-off speed control circuit.
  2. Identify applications for a bleed-off speed control circuit.
  3. Explain the limitations of bleed-off speed control circuits.
  4. Construct and operate a bleed-off circuit to obtain speed control of a cylinder.