Valve Technology

Valve Technology

OBJECTIVES

At the end of this seminar participants will have:

• An understanding of different parameters affecting the operation of valves
• The ability to select the right valve for the particular application
• The ability to perform the necessary calculation for valve sizing
• An understanding of the problems associated with valves like flashing, slamming and water hammer
• The ability to perform troubleshooting of systems involving valves
• The ability to decide on the right maintenance plan concerning different types of valves

WHO SHOULD ATTEND?

Mechanical Engineers, Under Development Engineers Supervisors and Technicians.

COURSE OUTLINE

• Basics of the Valve Technology
• Valves Technology
• Types of Valves
• Valves characteristics
• Sealing performance
  • Leakage Criterion
  • Leakage Classifications
  • Sealing Mechanisms
  • Valve stem seals
• Flow characteristics
  • Flow through valves
  • Valve flow characteristics
  • Linear & equal %
• Manual versus Automatic Valves
• Manual Valves
• Functions of manual valves
• Methods of regulation
• Valve Types:

• • Stopping/starting valves
  • Control valves

• Valve end connections
• Valves rating
• Valves seating
• Types of manual valves

• • Gate Valves
  • Plug Valves
  • Ball Valves
  • Butterfly Valves
  • Pinch Valves
  • Diaphragm Valves

• Check Valves
• Applications
• Types of Check Valves

• • Lift check valves
  • Swing check valves
  • Tilting-disc check valves
  • Diaphragm check valves
• Check Valves Operation
• Selection of Check Valves
• Relif and Safety Valves: Function and Operation
• Relief and Safety Valves
• Relief Valves Types
• Pressure-relieving devices
• Automatically operated valves
• Direct-acting & piloted pressure relief valves
• Modulating, full-lift, and ordinary pressure relief valves
• Valve Loading
• Safety Valves
• Operation of Direct-acting pressure relief valves
• Blowdown
• Relief valves problems
• Rupture Valves
• Applications of Rupture Discs
• Rupture discs vs. Pressure relief valves
• Rupture discs in gases and liquid service
• Temperature and bursting pressure relationship
• Pressure tolerances
• Design and performance of ductile metal rupture discs
• Types of Rupture discs:
  • Prebulged rupture discs
  • Reverse buckling discs
  • Vent panels
  • Graphite rupture discs
  • Double disc assemblies
• Rupture disc and pressure relief valve combinations
• Selection of rupture discs
• Operation of Rupture Discs
• Valves Troubleshooting
• Valves Problems and Troubleshooting
• High Pressure Drop

• • Pressure Recovery Characteristics

• Cavitation in Valves

• • Incipient and choked cavitation
  • Flow curve cavitation index
  • Cavitation-elimination devices
• Flashing versus Cavitation
• Flow Choking
• High Velocities
• Water Hammer
  • What causes water hammer?
  • Water Hammer Calculations
  • Solutions for water hammer
• Surge Protection
• Check valve slamming
• Noise problems
• Clean air standards
• Life loading
• Packing for fugitive-emission control
• Troubleshooting the Control Valves
• Control Valves & Actuators
• Control Valves Types
• Linear Valve Features
• Rotary Valve Features
• Control Valve Flow Characteristics
  • Quick Opening Characteristics
  • Linear & Equal %
• Actuation systems
• Types of actuators
  • Pneumatic Piston Actuator
  • Electric motors
  • Electrohydraulic Actuators
• Actuator Performance
• Valve Positioner
• Operation of Positioners
  • Positioner calibration
• Valve Sizing and Selection
• Valve-sizing criteria for manual valves
• Valve-sizing criteria for check valves
• Valve-sizing criteria for throttling valves
• Incipient and advanced cavitation
• Terminal pressure drop ratio
• Percent of Flashing
• Pressure Recovery Coefficient
• Valve Sizing & Selection Procedure
• Selecting a valve type
• Different valves characteristics