1. Control Valves and Regulators; Test Review - Agenda
Activity
Est. Time
1. Agenda 5
2. Learning Objectives
3. The Control Valve 20
4. Control Valve Operation 30
BREAK 10
5. Control Valve Operation – Continued
6. Regulators
7. Test Review 40
8. Summary and Wrap-up
9. Additional Activities 50
10. Lab Activity
Instrumentation I - Session 11

2. Session 11 – Objectives (Page 1)
1. Given a drawing or actual device, identify the main components of a control valve:
body
bonnet
disc
actuator
stem
seat
spring
valve positioner
handwheel
I/P transducer
2. Given a drawing or actual device, identify and describe the following:
current to pneumatic transducer
indications of a sticking control valve.
Instrumentation I - Session 11

3. Session 11 – Objectives (Page 2)
3. Define terms associated with valves and other final control elements:
“air to close” (fail open)
“air to open” (fail closed)
fail last/in place/as is
4. Describe operating scenarios in which fail open, fail closed, and fail last positions are desirable.
5. Discuss the purpose of diaphragm valve actuators and piston valve actuators.
6. Compare and contrast a spring and diaphragm actuator to a cylinder actuator.
7. Explain why the action of a valve actuator may not correspond with the action of the valve.
Instrumentation I - Session 11

4. Session 11 – Objectives (Page 3)
8. Describe a valve positioner and explain three of its uses.
9. Explain the function of each of the three gauges located on a pneumatic valve positioner.
10. Given a pressure indication for each of the three gauges on a valve positioner, predict what the control valve movement will be.
11. Describe two ways a controller’s output signal can be reversed at the valve so the valve’s action is opposite of the controller output signal.
12. Describe a control scheme that utilizes reversing a controller’s output signal at the valve.
13. Explain how reversing a controller’s output signal at the valve affects the valve’s fail safe position upon loss of air.
Instrumentation I - Session 11

5. Session 11 – Objectives (Page 4)
14. Explain the purpose and operation of the following:
globe valves
three-way valve
butterfly valves
15. Given a drawing, picture, or actual device, identify and describe pressure regulators.
16. Define the following terms associated with regulators:
back pressure regulator (self-actuated)
pressure reducing regulator
17. Given a Process Flow Diagram and/or P&ID, locate and identify pressure regulators used in process control.
18. Given an instrument air pressure regulator, perform the following tasks:
blow down regulator to check for condensate or oil
set specific pressure for operating final control element.
Instrumentation I - Session 11

6. Control Valve Key Components
Instrumentation I - Session 11

7. Fail Conditions
Instrumentation I - Session 11

8. Spring and Diaphragm Actuator
Instrumentation I - Session 11

9. Piston Type Actuator
Instrumentation I - Session 11

10. Actuator Operation
Instrumentation I - Session 11

11. Actuator and Valve Action
Instrumentation I - Session 11

12. Valve Positioners – Position the Valve
Instrumentation I - Session 11

13. Valve Positioners – Reverse the Action
Instrumentation I - Session 11

14. Valve Positioners – Mimic the Valve Trim Type
Instrumentation I - Session 11

15. Valve Postioner Operation
Instrumentation I - Session 11

16. Output Signals
Instrumentation I - Session 11

17. Globe Control Valve
Instrumentation I - Session 11

18. Three-Way Control Valve
Instrumentation I - Session 11

19. Butterfly Control Valve
Instrumentation I - Session 11

20. Regulators
Instrumentation I - Session 11

21. Backpressure Regulators
Instrumentation I - Session 11

22. Pressure Reducing Regulators
Instrumentation I - Session 11

23. Symbols for Back Pressure Regulator
Instrumentation I - Session 11

24. Symbols for Pressure Reducing Regulator
Instrumentation I - Session 11