Pneumatic Control Systems
Module I. Introduction
Module II. Control Valves
Module III. Pneumatic Pilot Controllers
Module IV. Operation Of Pneumatic Control System
Module V. Troubleshooting
Module VI. Self--Contained Control Devices
A. Description
B. Factors Affecting Flow Through a Control Valve
1. Area of Flow Path
2. Pressure Drop
3. Critical Flow
4. Cavitation and Pre-Flash
5. Dynamic Instability
6. Valve Noise
7. Emulsions and Foams
8. Corrosion and Erosion
9. Other factors
C. How a Valve Operates ?
1. Diaphragm Actuator Force
2. Spring Force
3. Unbalance Force
4. Plug Stroke or Travel
D. Types of Control Valves
E. Actuator
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A. Pressure Control
B. Temperature Control Pilots
1. Thermostat Control
2. Fluid Bulb Control
C. Flow Control Pilot
D. Level Control Pilots
1. Displacement Float Type
2. Liquid Head Type Level Controller
F. Modes of Pilot Control
1. Set Point Adjustment
2. Proportional Control
3. Reset
4. Derivative or Rate
5. Direct or Reverse Acting Pilot
A. Adjustment for Stable Operation
B. Supply Air Pressure Adjustment
C. Adjusting the Set Point
A. Process Sensing Devices
B. Instrument Air Source
C. Troubleshooting the Pilot
D. Air Line from Pilot to Control Valve
E. Control Valve
A. Pressure Regulators
B. Safety Relief Valves
For more information : valves@kiccnet.com
