Control Valve and Sizing:Selection and Maintenance

OBJECTIVE

• Understand what happens inside a control valve from basic fluid mechanics point of view
• Appreciate the difference between cavitation and flashing, and know what choked flow is
• Do simple calculations to determine CV values
• Recognise 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

OUTLINE

1.      Introduction To Control Valve Theory

• Introduction
• Definition of a control valve
• Energy types
• What is happening inside a control valve
• Cavitation
• Flashing
• Choked Flow
• Valve Coefficient Cv

2.     Different Types Of Control Valves

• Globe Valves
• Butterfly
• Eccentric disk
• Ball
• Rotary Plug
• Diaphragm and Pinch

3.     Characteristics

• Equal percent
• Linear
• Quick opening
• Selection method

4.     High Pressure Drop Applications

• Cavitation Control
• Cavitation Elimination
• Low Noise
• Diffuser Plates
• Chokes
• Disk Stack Technology
• Pressure Balanced Trim

5.      Use Of Computer Program For Valve Sizing

6.     Examples Of High Pressure Drop Applications

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

7.     Actuators

• Pneumatic
• Hydraulic
• Electric
• Sizing on rotary valves
• Sizing on linear valves
• Mounting considerations
• Manual overrides
• Accessories

8.      Positioners

• Basic principles
• Conventional pneumatic
• Conventional electro-pneumatic
• Smart Positioners
• Feedback options

9.     Materials

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

10.   Quality Standars

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

11.   Installation/maintenance

• Installation
• Commissioning
• Routine Maintenance

12.  Summary, Open Forum & Closing

TRAINING METHOD

Presentation,

Discussion,

Case Study,

Evaluation

FACILITIES

Training Kit,

Flash disk, Handout,

Certificate,

Lunch,

2 X Coffee Break,

Souvenir,

Pick up participant Yogyakarta

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