The most common mechanical device used in process operations is the valve. Valves are used to control the flow of liquids and gases in piping systems.

Valves come in a wide variety of shapes, sizes, and types. This is because the processing systems, in which they are used, are also very varied (dealing with different products, pressure and temperature ranges).

This unit covers a variety of mechanical concepts and practical skills – principally the identification, operation, and maintenance of mechanical valves.

The objective of this unit is to enable the learner to:

• Understand and identify different types of valves both on a P&ID or by inspecting the valve in the workshop, process/production plant
• Understand and explain the mechanical principals and operation of various valves
• Understand and explain the mechanical principles of operation of the listed valves. Including mechanical stops, seats & seals, movement and actuator systems, greasing systems
• Understand and explain the appropriate use of each valve type
• Identify the parts of valves and explain their purposes
• Identify and carry out basic on-line maintenance on major valve types

COURSE CONTENT:

• Introduction
• Introduction to Valves 
• Classification of Valves 
• Valve Types
• Gate Valves 
• Manual Actuators
• Electrical Motor Actuators 
• Pneumatic Actuator 
• Hydraulic Actuators
• Solenoid Actuators
• Positioners
• Local Operation
• Remote Operation
• Automatic Operation of a Valve
• Valve Maintenance
• Hazards associated with valves
• General Maintenance Guidelines
• Lapping a Valve Disc and Seats
• Valve Stem Packing
• Valve Leakage Tests 
• Valve Lubrication
• Valves symbols
• Selecting a valve type
• Valve materials
• Valve car seal open/closed
• Car-Seal program
• Why use a car seal instead of a padlock and chain to lock a valve?
• Group Lockout
• Valve Interlock System
• Using a valve interlock system to switch media
• The keys to the system
• Safe isolation of a safety valve for maintenance
• The range of valve interlocks
• Assessment