VALVE REPAIR

DESCRIPTION

It is claimed that the majority of control valve, worldwide, are not correctly sized. There will be some argument about this statement but we do know that selecting control valve for specific applications is not well understood

OBJECTIVES

Understand what happens inside a control valve from basic fluid mechanics point of view, control valve sizing

COURSE MATERIALS :

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

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

• Cavitation Control

• Cavitation Elimination

• Low Noise

• Diffuser Plates

• Chokes

• Disk Stack Technology

• Pressure Balanced Trim

EXAMPLES OF HIGH PRESSURE DROP APPLICATIONS

• Water - pump bypass

• Steam - turbine bypass

• Gas - pressure reducing

• Oil - choke valve

ACTUATORS

• Pneumatic

• Hydraulic

• Electric

• Sizing on rotary valves

• Sizing on linear valves

• Mounting considerations

• Manual overrides

• 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

• Packing

• Guides and gaskets

QUALITY STANDARDS

• ASME

• NACE

• ISO 9000/2000

• PED

• NAMUR

INSTALLATION / MAINTENANCE

• Installation

• Commissioning

• Routine Maintenance

• Fault finding

• Modes of failure

USE OF COMPUTER PROGRAM FOR VALVE SIZING

• Control Valve sizing
• Relief valve sizing
• Pressure safety valve sizing

DESIGN FOR

Forman, Technician, Maintenance supervisor, Mechanical supervisor;  Mech. Instr. fresh engineers

INSTRUCTOR

Ir.  Joko Waluyo, MT., Ph.D and Team

PRICE

Please call us