Control Valve Study Material - Instrumentation Tools

Direct-actuated Safety and Relief Valves

Pressure Relief Valves (PRVs) and Pressure Safety Valves (PSVs) are special types of valves designed to open up in order

A troublesome phenomenon in severe services is the audible noise produced by turbulence as the fluid moves through a control

A problem common to control valves used in slurry service (where the process fluid is a liquid containing a substantial

Fluid passing through a control valve experiences changes in velocity as it enters the narrow constriction of the valve trim

When a fluid passes through the constrictive passageways of a control valve, its average velocity increases. This is predicted by

The root cause of the problem – a varying pressure drop caused by frictional losses in the piping and other

Control valves are mechanical devices with moving parts, and as such they are subject to friction, primarily between the valve

Both gas and liquid control valves may experience what is generally known as choked flow. Simply put, “choked flow” is

The flow capacity of a valve (Cv) is a quantitative rating of its ability to pass a fluid flow for

Sizing a control valve for gas or vapor service is more complicated than for liquid service, due to the compressibility