Valve Maintenance
Valve Maintenance
OBJECTIVES
- Define the items that must be considered when performing valve maintenance
- Describe the type of defects that are found in different valve components during inspection
- Identify causes for the defect
- List the possible corrective actions concerning the defect
- Describe the best corrective action and the suitable maintenance technique for each type
- Describe the checks and inspections performed after assemble the valve components
- Describe the proper method to store the valve & valve actuator ready for future use
COURSE OUTLINE
- Introduction
- Function of valves in the piping system
- Types of valves
- How the valve body is connected to the piping system?
- Types of valves
- Gate valves (Rising stem & non rising stem): How it works? and the detailed construction
- Globe valves: How it works? And the detailed construction
- Plug valves: How it works?, Single port, multi-port valves,
- Diaphragm valves
- Ball valves: Reduced bore & full bore, spring loaded seat rings & fixed seat rings
- Butterfly valves
- Check valves (non return valves): Different types, the mechanical construction for each type
- Safety & relieve valves: The application of each one, and the components
- Steam traps & strainers
- Gate valve operational problems & maintenance
- Strip down, inspection of components and the proper repair action & techniques
- Assemble the valve and pressure test
- Globe valve operational problems & maintenance
- Strip down, inspection of components and the proper repair action & techniques
- Assemble the valve and pressure test
- Plug valve operational problems & maintenance
- Strip down, inspection of components and the proper repair action & techniques
- Assemble the valve and pressure test
- Diaphragm valve operational problems & maintenance
- Strip down, inspection of components and the proper repair action & techniques
- Assemble the valve and pressure test
- Ball valve operational problems & maintenance
- Strip down, inspection of components and the proper repair action & techniques
- Assemble the valve and pressure test
- Butterfly valve operational problems & maintenance
- Strip down, inspection of components and the proper repair action & techniques
- Assemble the valve and pressure test
- Valve packing
- Introduction: What is the function of valve packing?
- Overview of valve packing materials (types and forms)
- Packing removal
- New packing rings preparation and installation procedure
- Check valve operational problems & maintenance
- Strip down, inspection of components and the proper repair action & techniques
- Assemble the valve and pressure test
- Safety & Relieve valves operational problems & maintenance
- Strip down, inspection of components and the proper repair action & techniques
- Assemble the valve and pressure test
- Control valves
- How it works?
- Required maintenance & shape of failures
- Control valve repair
- Integral valve maintenance
- Introduction
- Describe and evaluate typical valve seat defects
- Understand inspection practices
- Understand when and how much to lap a valve seat
- Understand allowable seat leakage
- Review valve repair tools
- Valve specifications
- Materials, schedule, and valve related codes and standards (ASME / ANSI code)
- Discuss the factors that affect the selection of valve materials
- Valve actuators
- The function of valve actuator
- Types of valve actuators (Diaphragm pneumatic, Pneumatic cylinder, Hydraulic cylinder, and electric motor actuator): How it works? Maintenance problems
- Special valves such as solenoid, vacuum breaker, and pilot operated valves