OTSPCV001 PROCESS CONTROL VALVES - Mechanical
Time & Location
About the Event
Process Control Valves (Ref:OTSPCV001)
To understand the function, operation, maintenance, and troubleshooting of common types of control valves.
Course Description This lesson explains control valve selection factors and demonstrates typical linear and rotary control valve functions and applications. Control valve bodies for several types of valves including globe, butterfly, and ball valves are described. The function and components of valve trim, including the relationship between flow characteristic and trim type is explained. This lesson trains participants to recognize, identify, and understand actuators and positioners as they relate to control valve trim. The parts and operation of diaphragm and piston actuators as well as pneumatic and electro pneumatic positioners are demonstrated.
Who Should Attend
This program is excellent for training instrument technicians as well as for the multi-craft training needs of process and manufacturing.
A working knowledge of fluid flow characteristics, fluid flow measurement, and typical elements in process loops is recommended.
At the end of this course you will be able to maintain process control valves.
Define control valve function in process systems
Explain how control valves are used in process industries
Describe how control valves can affect process efficiency, product quality, maintenance, safety, and the environment
Describe the systems analysis approach to selecting a control valve
List the types of data needed to choose a control valve for a system .
Identify examples and applications of linear and rotary valves as well as the associated function and components of valve trim.
Describe how differential pressure and flow path affect fluid flow.
Describe how the ability of trim to withstand corrosion and erosion affects trim design
List trim materials that can withstand corrosion and erosion
Describe advantages and disadvantages of various packing materials
Describe seal designs that are required where leakage is not acceptable
Describe the principles of pneumatic valve actuation
Identify diaphragm actuator parts
Describe actuator response
Describe the operation of piston actuators.
Identify the advantages and limitations of pneumatic actuators
Describe electric actuator operation
Identify common actuator and positioner types
Identify positioner function
Describe principles of pneumatic positioner operation
Identify positioner parts
Describe how positioners can improve valve response time
Describe how positioners can change valve flow characteristics
Describe how positioners can change actuator response
Describe the selection factors that indicate the appropriate actuator or positioner for system applications.
Match failsafe requirement with the appropriate actuator response
Identify external fail-safe devices used with piston actuators.
Describe control valve malfunctions
List causes and effects of control valve malfunctions
Recognize the importance of following facility safety guidelines and manufacturer's recommendations for valve maintenance
Describe linear valve disassembly steps
Clean and inspect linear valve packing and trim
Recommend replacement of linear valve trim parts
Describe linear valve parts replacement
Describe linear valve packing replacement
List linear valve re-assembly steps
Determine the outcome of linear valve stroking
Describe linear valve leak testing
Explain the necessity of linear valve lapping
Describe the lapping process
Describe rotary valve disassembly steps
Clean and inspect rotary valve packing and trim
Recommend replacement of rotary valve trim parts
Describe replacement of other rotary valve parts
Describe replacement of rotary valve packing replacement
Describe rotary valve re-assembly
Determine outcome of rotary valve stroking
List common symptoms of a failed diaphragm actuator
List the causes of a diaphragm actuator failure
List maintenance requirements for a diaphragm actuator
Remove and inspect the stem and diaphragm assembly and the range spring and seal bushing on a diaphragm actuator
Replace the gasket and O-ring on a diaphragm actuator
List common symptoms of a failed piston actuator
List the causes of piston actuator failure
List maintenance requirements for a piston actuator
Remove and inspect the ring and the stem and piston assembly on a piston actuator
List common failures of pneumatic and electro-pneumatic positioners and the causes of failure
List maintenance requirements for a pneumatic positioner
Inspect and clean the pilot relay assembly on a pneumatic positioner
List the causes of i/p transducer failure on an electro-pneumatic positioner
Adjust the zero and span on an electro-pneumatic positioner.
Course Review and Feedback