Valve Selection and Maintenance

Objectives

Upon the successful completion of this course, participants will be able to: –

• An understanding of valve characteristics and different parameters affecting the operation of valves
• Knowledge of the main types of valves and the ability to select the right valve for the particular application including Control Valves, Non-Return Valves and Safety Valves
• The ability to perform the necessary calculation for valve sizing
• Knowledge of valve control systems including actuators and positioners
• An understanding of the problems associated with valves like flashing, slamming and water hammer
• The ability to perform troubleshooting of systems involving valves and making decisions on the right maintenance plan concerning different types of valve

Outline

Day 1: Basic of the Valve Technology

• Types of Valves and Selection
• Valve Parts and Components
• Valve Flow characteristics – Linear Valve Features
• Control Valve Flow Characteristics – Quick Opening, Linear, Equal Percentage
• Valve-sizing criteria – Valve Coefficient, Cv
• Pressure Recovery

Day 2: Valve Functions and Types

• Functions of valves and Methods of regulation
• Valve Types – Stopping/starting valves, Control valves
• Valve end connections
• Valve components and trims
• Types of valves, Globe, Gate, Ball, Plug, Butterfly Valves, Pinch, Diaphragm Valves
• Pressure Regulation Valves

Day 3: Check (Non-Return) Valves, Relief and Safety Valves

• Applications and selection of Check (Non-Return) Valves
• Types of Check Valves – Swing, Lift, Tilting-disc, Piston
• Rupture Disk Valves
• Buckling (Shear) Pin Valves
• Relief and Safety Valves Types
• Relief Valves Problems

Day 4: Control Valve Actuators and Positioners

• Actuation Systems and Forces
• Linear and Rotary Actuators
• Types of Actuators – Pneumatic / Hydraulic, Piston, Diaphragm, Electric motors
• Actuator Performance and Selection
• Valve Positioners and Operation
• Examples of valve installation plans and checklists

Day 5: Valve Troubleshooting

• High-Pressure Drop – Pressure Recovery Characteristics
• Cavitation and Flashing in Valves – Cavitation-elimination devices
• High Velocities – Erosion
• Water Hammer –  Causes and Solutions
• Surge Protection
• Noise Attenuation Problems

Troubleshooting the Control Valves

Who Should Attend ?

• Engineers and Technicians of Mechanical, Electrical and Chemical Engineering will benefit largely from this training session
• Maintenance, Operation, and People in R&D departments are recommended to attend also