By the end of this course delegates will be able to:

• Appreciate the difference between cavitation and flashing, and know what choked flow is
• Do simple calculations to determine CV values
• Recognize severe service applications and have an appreciation for the methods of tackling the problems associated with such applications
• Know about all the different types of control valves commonly in use and understand the relative advantages of each
• Choose between different characteristics on offer and specify seat leakage rates
• Size actuators for linear and rotary applications and know the relative advantages of pneumatic, hydraulic and electric types
• Have a basic understanding on how to select materials for bodies, trims, packing boxes, and gaskets
• Make use of a computer sizing program to assist with the selection of control valves
• Understand the failure modes for control valves and demonstrate new approaches to troubleshooting

Control valve specialists, electrical engineers, instrumentation and control engineers and technicians, maintenance engineers, technicians and planners, plant safety specialists, process control engineers, consulting engineers, project engineers, and systems engineers

Introduction to Control Valve Theory

• Introduction and definitions
• Energy types, What happens inside a control valve
• Cavitations and flashing, Choked flow, Valve co-efficient CV

Different Types of Control Valves

• Globe valves, Butterfly, Eccentric disk
• Ball, Rotary plug, Diaphragm and pinch

Characteristics

• Equal percent, Linear, Quick opening, Selection method

High Pressure Drop Applications

• Cavitations control and elimination
• Low noise, Diffuser plates, Chokes
• Disk stack technology, Pressure balanced trim

Valve Sizing Examples of High Pressure Drop Applications Using Computer Programs

• Water – pump bypass, Steam – turbine bypass
• Gas – pressure reducing, Oil – choke valve

Actuators

• Pneumatic, Hydraulic, Electric
• Sizing on rotary valves and linear valves
• Mounting considerations
• Manual over-rides, Accessories

Positioners

• Basic principles, Conventional pneumatic
• Conventional electro-pneumatic
• Smart positioners, Feedback options

Pneumatic Circuits

• Volume tank fail system, Fail fix, Volume boosters

Materials

• Body materials and pressure ratings
• Trim and packaging
• Guides and gaskets

Quality Standards

• ASME, NACE, ISO 9000/2000
• PED, NAMUR

Installation and Maintenance

• Installation, commissioning and routine maintenance
• Fault finding
• Modes of failure

CDGA attendance certificate will be issued to all attendees completing minimum of 80% of the total course duration.