Valve Technology

Valve Technology

OBJECTIVES

• An understanding of valve characteristics and different parameters affecting the operation of valves
• Knowledge of the main types of valves and the ability to select the right valve for the particular application including Control Valves, Non-Return Valves and Safety Valves
• The ability to perform the necessary calculation for valve sizing
• Knowledge of valve control systems including actuators and positioners
• An understanding of the problems associated with valves like flashing, slamming and water hammer
• The ability to perform troubleshooting of systems involving valves and making decisions on the right maintenance plan concerning different types of valves

WHO SHOULD ATTEND?

• Supervisors
• Team Leaders
• Facilities, chemical, electrical, instrumentation, maintenance, & mechanical engineers & technicians involved in designing, selecting, sizing, specifying, installing, testing, operating & maintaining shutoff, pressure relief, & control valves.

COURSE OUTLINE

• Types of Valves (globe, gate, ball, plug, check)
• Flow characteristics
  • Flow through valves
  • Valve flow characteristics
  • Linear, quick opening & equal %
• Valve Sizing
  • Calculating the correct Cv value
  • Selecting Valve Size Using Valve Coefficient
  • Calculations for Correct Valve Selection
• Sealing performance
  • Leakage Classifications
  • Sealing Mechanisms
  • Valve stem seals
• High Pressure Drop
  • Pressure Recovery Characteristics
  • Flow Choking
  • High Velocities
• Water Hammer
  • What causes water hammer?
  • Solutions for water hammer
• Troubleshooting the Control & Isolation Valves
  • Review of common faults
  • Developing a Preventive Maintenance Plan
• Review of the Week & Wrap-Up
• Defining the valve flow coefficient, Cv
• Choked flow
• Pressure recovery
• Flashing and cavitation
• Noise reduction
• Control valve selection and sizing
• Water hammer
• Valve seat leakage classifications
• Packing/stuffing box requirements
• Globe valves
• Gate valves
• Pinch valves
• Diaphragm valves
• Ball valves
• Butterfly valve
• Plug valve
• Check valves
• Inherent vs. installed characteristics
• Body selection guide
• Trim selection guide
• Actuator and accessory selection
• Manual and computer-based valve sizing
• I/P converter
• Diaphragm actuators
• Cylinder/piston-type actuator
• Electro-hydraulic actuation
• Electric actuator
• Solenoid valves
• Transfer mechanisms
• Valve positioners
• Valve testing and diagnostics
• Valve maintenance and repair
• Safety relief valves
• Rupture discs