Job Training Module 7_Valves

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Job Training Module 7_Valves
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    Abu Dhabi Gas Liquefaction Company Ltd Job Training Mechanical Technician Course Module 7 Valves  ADGAS Personnel & Training Division http://engmania7.blogspot.com   Personnel & Training Division Job Training—Mechanical Technician Valves/Rev. 0.0 Page 2 of 74  Contents Page No. Abbreviations and Terminology ................................................. 5 1 Introduction  …………………………………………………………..   6 2 Basic Valve Components ............................................................ 8 3 Block Valves ................................................................................. 11 3.1 Gate Valves ........................................................................ 11 3.2 Ball Valves .........................................................................   19 3.3 Plug Valves ........................................................................ 21 4 Flow Control (Throttle) Valves .................................................... 22 4.1 Globe Valves ..................................................................... 23 4.2 Butterfly Valves ................................................................. 27 4.3 Diaphragm Valves ............................................................. 29 4.4 Needle Valves .................................................................... 32 5 Non-return (Check) Valves .......................................................... 34 5.1 Swing Check Valves ......................................................... 35 5.2 Lift Check Valves .............................................................. 36 5.3 Piston Check Valves ......................................................... 38 5.4 Ball Check Valves ............................................................. 38 5.5 Stop Check Valve .............................................................. 39 http://engmania7.blogspot.com   Personnel & Training Division Job Training—Mechanical Technician Valves/Rev. 0.0 Page 3 of 74  Contents Page No. 6 Pressure Control Valves ............................................................. 40 6.1 Pressure Reducing Valves ............................................... 40 6.2 Pressure Relief    Valves (PRVs) ......................................... 43 6.3 Pressure Safety   Valves (PSVs) ........................................ 44 6.4 Rupture Discs .................................................................... 46 7 Valve Actuators ............................................................................ 49 7.1 Manual Actuators .............................................................. 50 7.2 Electric Motor Actuators (MOVs) ..................................... 52 7.3 Electric Solenoid Actuators (SOVs) ................................ 53 7.4 Pneumatic Actuators ........................................................ 55 7.5 Hydraulic Actuators .......................................................... 57 8 P&ID Valve Symbols .................................................................... 58 9 Valve Applications ....................................................................... 62 10 Valve Maintenance ....................................................................... 63 11 Summary ...................................................................................... 66 12 Glossary ....................................................................................... 67 Appendix A ................................................................................... 68 Appendix B ................................................................................... 71 Exercises 1-7 ................................................................................ 74 http://engmania7.blogspot.com   Personnel & Training Division Job Training—Mechanical Technician Valves/Rev. 0.0 Page 4 of 74  Pre-Requisite Completion of A.T.I. Maintenance Programme, ADGAS Induction Course and Basic Maintenance Technician Course. Course Objectives The Job Training Mechanical Technician Course is the second  phase of the development programme. It is intended specifically for Mechanical Maintenance Developees. On completion of the Course the developee will have acquired an awareness of some of the equipment, terminology, and procedures related to mechanical maintenance of ADGAS LNG plant. Appropriate safety procedures will continue to be stressed at all times. Module Objectives On completion of this module, the developee will be able to correctly : ã   identify valve parts and state their functions ã   identify types of valves and describe their applications ã   dismantle and re-assemble a valve ã    perform lapping of valve seats ã    perform static pressure testing of valves ã   describe valve selection and specification criteria ã   describe typical valve faults and their repair Methodology The above will be achieved through the following: ã    pre-test ã   classroom instruction ã   audio visual support ã   site visit ã   tasks & exercises ã    post-test http://engmania7.blogspot.com
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