Latest Fluid Control Valves Education

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Sliding-stem Valves

Textbook

A sliding-stem valve body is one where the moving parts slide with a…

On/off Shut-off Valves

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An on/off valve is the fluid equivalent of an electrical switch: a…

Pressure-based Flowmeters

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All masses require force to accelerate (we can also think of this in…

Common Control Valve Problems

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Valves can experience a number of problems, most of them either…

Limit, Selector, and Override Controls

Textbook

Another category of control strategies involves the use of signal…

Pneumatic Sensing Elements

Textbook

Most pneumatic instruments use a simple but highly sensitive mechanism…

Dampers and Louvres

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A damper (otherwise known as a louvre) is a multi-element flow control…

Mathematical Problem-solving Techniques

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Some problem-solving techniques are unique to quantitative problems,…

Chromatography: Methods, Detectors and Species

Textbook

Imagine a major marathon race, where hundreds of runners gather in one…

Valve Seat Leakage

Textbook

In some process applications, it is important that the control valve…

Pneumatic Actuator Response

Textbook

A limitation inherent to pneumatic valve actuators is the amount of…

Basics of Electrical Current

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Current is the name we give to the motion of electric charges from a…

Differential Pressure Transmitters

Textbook

One of the most common, and most useful, pressure measuring…

On/off Shut-off Valves

Textbook

An on/off valve is the fluid equivalent of an electrical switch: a…

Teaching Diagnostic Principles and Practices

Textbook

Diagnostic ability is arguably the most difficult skill to develop…

Control Valve Actuators

Textbook

The purpose of a control valve actuator is to provide the motive force…

Comparison of Op-Amp Circuits With Analogous Pneumatic Mechanisms

Textbook

Self-balancing pneumatic instrument mechanisms are very similar to…

Control Valve Sizing

Textbook

When control valves operate between fully open and fully shut, they…

Fluid Mechanics

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A fluid is any substance having the ability to flow: to freely change…

Chemical Reactor Temperature Control Example

Textbook

Sometimes we encounter a diversity of instrument signal standards in…

High-reliability Control Systems

Textbook

As discussed at the beginning of this chapter, instrumentation safety…

Tube and Tube Fittings

Textbook

Tube, like pipe, is a hollow structure designed to provide an enclosed…

Equivalent Series and Parallel Circuits

Textbook

Impedance in a series circuit is the orthogonal sum of resistance and…

4-wire “Passive” Versus “Active” Output Transmitters

Textbook

Some self-powered (4-wire) analog electronic transmitters are designed…

Radiation Level Measurement

Textbook

Certain types of nuclear radiation easily penetrates the walls of…

Classical Mechanics

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Classical mechanics (often called Newtonian mechanics in honor of…

Analog Electronic PID Controllers

Textbook

Constructing PID control systems using discrete components is a…

The s Variable: Euler’s Relation and Phasor Expressions of Waveforms

Textbook

A powerful mathematical concept useful for analyzing practically any…

The HART Digital/Analog Hybrid Standard

Textbook

A technological advance introduced in the late 1980’s was HART,…

DC Motor Speed Control

Textbook

DC electric motors generate torque by a reaction between two magnetic…

Phasors, Phase Shift and Phasor Algebra

Textbook

Phasors are to AC circuit quantities as polarity is to DC circuit…

Vibration Physics

Textbook

One very convenient feature of waves is that their properties are…

Split-range Control

Textbook

There are many process control applications in the industry where it…

Radiative Temperature Measurement

Textbook

Temperature measurement devices may be classified into two broad…

Laser Spectroscopy

Textbook

A laser is a light source emitting waves of light that not only…

Difference Between Calibration and Re-ranging

Textbook

What is Calibration? To calibrate an instrument means to check and…

The Stuxnet Virus

Textbook

In November of 2007 a new computer virus was submitted to a virus…

Laminar Flowmeters

Textbook

A unique form of differential pressure-based flow measurement deserves…

Chemical Reactor Temperature Control Example

Textbook

Sometimes we encounter a diversity of instrument signal standards in…

Calibration Errors and Testing

Textbook

The efficient identification and correction of instrument calibration…

Controller Output Current Loops

Textbook

The simplest form of 4-20 mA current loop is the type used to…

Non-dispersive Luft Detector Spectroscopy

Textbook

Non-dispersive analysis, while newer in discovery than dispersive…