Valves Course

Lesson 1 • Valve Classification Systems

Organises valves by motion type, port configuration, and service duty. Classification skills enable accurate specification and catalog navigation throughout the course.

Lesson 2 • Role of Valves in Fluid Systems

Valves control flow, pressure, and direction in piping networks. This context establishes why valve selection and operation are critical to system safety and efficiency.

Lesson 3 • Pressure and Temperature Ratings

Explains pressure-temperature (P-T) rating tables and class designations. Students apply rating data to verify valve suitability before installation.

Lesson 4 • Valve Anatomy and Key Components

Identifies body, bonnet, trim, stem, and actuator as universal valve elements. Understanding each part's role prepares students for maintenance and troubleshooting topics.

Lesson 1 • Check Valve Types and Selection

Presents swing, lift, dual-plate, and ball check designs for backflow prevention. Selection criteria connect to pump protection and system hydraulics.

Lesson 2 • Gate Valve Design and Operation

Covers wedge, parallel-slide, and knife gate configurations for full-bore isolation. Students distinguish when gate valves outperform other isolation options.

Lesson 3 • Installation and Orientation Requirements

Details correct pipe orientation, flow direction markings, and bypass arrangements. Proper installation prevents premature wear and maintains valve performance.

Lesson 4 • Common Failure Modes and Inspection

Identifies seat leakage, stem packing failure, and disc erosion as primary defects. Early detection skills reduce unplanned shutdowns and maintenance costs.

Lesson 1 • Sealing Standards and Leakage Classes

Introduces seat leakage classification standards and acceptance criteria for rotary valves. Leakage class selection balances cost against process safety requirements.

Lesson 2 • Butterfly Valve Types and Disc Geometry

Explains concentric, double-offset, and triple-offset disc designs and their sealing performance. Offset geometry reduces seat wear and extends service intervals.

Lesson 3 • Flow Characteristics of Rotary Valves

Analyses equal-percentage, linear, and quick-opening flow curves for rotary valves. Flow characteristic knowledge is prerequisite for control valve sizing in later chapters.

Lesson 4 • Plug Valve Design and Lubrication

Presents tapered and cylindrical plug designs, including lubricated and non-lubricated variants. Lubrication systems affect maintenance schedules and suitability for clean services.

Lesson 1 • Valve Positioners and Smart Instruments

Explains analog, digital, and HART-enabled positioners that improve valve accuracy. Smart positioners enable diagnostics and partial-stroke testing from the control room.

Lesson 2 • Valve Body and Trim Selection

Matches globe, rotary, and angle body styles to process conditions and control requirements. Trim selection determines rangeability, noise, and cavitation resistance.

Lesson 3 • Pneumatic and Electric Actuators

Compares spring-and-diaphragm, piston, and electric motor actuators for control valves. Actuator selection affects response speed, fail-safe position, and energy source.

Lesson 4 • Control Valve Sizing Fundamentals

Applies flow equations to calculate required Cv for liquid, gas, and steam services. Accurate sizing prevents oversizing, instability, and excessive pressure drop.

Lesson 1 • Set Pressure and Accumulation Limits

Explains set pressure, overpressure allowance, and blowdown as key performance parameters. These limits define acceptable operating windows and code compliance boundaries.

Lesson 2 • Relief Valve Sizing Methods

Applies API and equivalent sizing equations for liquid, vapour, and two-phase flow. Correct sizing ensures full relief capacity without chatter or instability.

Lesson 3 • Safety Relief Valve Design

Covers conventional, balanced-bellows, and pilot-operated relief valve internals. Each design addresses specific back-pressure and service conditions.

Lesson 4 • Overpressure Protection Principles

Defines overpressure scenarios, protected equipment limits, and relief device hierarchy. Understanding protection philosophy is essential before sizing any relief device.

Lesson 1 • Electric Motor Actuators

Covers multi-turn and part-turn electric actuators, torque switches, and position feedback. Electric actuators suit remote locations where instrument air is unavailable.

Lesson 2 • Valve Automation Packages and Accessories

Assembles complete automated valve packages including positioners, switches, and junction boxes. Package specification ensures compatibility between valve, actuator, and control system.

Lesson 3 • Pneumatic Actuator Systems

Explains instrument air supply, volume tanks, and solenoid valve integration for pneumatic actuators. Reliable air supply is critical for fail-safe operation during emergencies.

Lesson 4 • Manual Actuator Types and Torque

Covers handwheels, levers, gear operators, and chain wheels for manual valve operation. Torque calculations ensure operators can actuate valves safely under maximum differential pressure.

Lesson 1 • Seat and Disc Lapping and Grinding

Covers lapping compounds, lapping tools, and surface finish requirements for metal-seated valves. Restored seating surfaces return valves to acceptable leakage class.

Lesson 2 • Predictive and Preventive Maintenance Programs

Establishes inspection intervals, condition monitoring methods, and maintenance records for valve fleets. Structured programmes reduce unplanned failures and extend valve service life.

Lesson 3 • Packing and Gasket Replacement

Explains packing removal, re-packing procedures, and live-loading for fugitive emission control. Packing integrity directly affects environmental compliance and personnel safety.

Lesson 4 • Pre-Installation Inspection and Handling

Covers receiving inspection, storage, and handling procedures to prevent damage before installation. Proper pre-installation checks reduce costly rework and commissioning delays.

Lesson 1 • Valve Tagging, Marking, and Documentation

Covers nameplate data, valve tagging systems, and as-built documentation packages. Complete documentation supports maintenance, regulatory audits, and plant modifications.

Lesson 2 • Key International Valve Standards

Surveys ASME, API, ISO, and EN valve standards and their scope of application. Knowing which standard governs a valve type prevents specification errors and procurement disputes.

Lesson 3 • Writing Valve Datasheets

Guides completion of standardised valve datasheets covering service conditions, materials, and testing. Accurate datasheets are the primary communication tool between engineers and suppliers.

Lesson 4 • Inspection and Test Plans

Develops inspection and test plans (ITPs) defining hold points, witness points, and review points. ITPs ensure third-party and client oversight at critical manufacturing stages.