Pressure Relief Valve Principle
A relief valve or pressure relief valve (PRV) is a type of safety valve used to control or limit the pressure in a system; pressure might otherwise build up and create a process upset, instrument or equipment failure,…
Dome Valve Working Principle
Dome Valve is a pressure tight compressed air operated valve, capable of returning over one million maintenance-free cycles, even in abrasive, hazardous or toxic applications. It is unique in its ability…
Reversing Control Valve Actuator Fail Safe Mode
Reversing Control Valve Actuator Fail Safe Mode I want to reverse the "fail safe" mode of a Masoneilan (MIL) make control valve from "fail open" to "fail close " and vice…
Why we Require Dual SOV on a Control Valve?
Solenoid valves are often used in some applications in which a control valve under certain conditions requires where it quickly was driven to the fail position. Solenoid valves are usually…
Types of Level Gauges
Level gauge is a device which is used to show the level of fluids in fields. Depending on the type of application used, the type of level gauge should be…
Thermocouple Properties, Temperature Ranges, Element Construction
Thermocouple Applications : (J)–Iron vs Constantan (Most Common) May be used in vacuum, oxidizing, reducing, and inert atmospheres. Heavier gauge wire is recommended for long term life above 1000°F since…
Types of Thermocouple Measuring Junction
Types of Thermocouple Measuring Junction There are four types of thermocouple measuring junction constructions : Grounded Thermocouple Junction Ungrounded Thermocouple Junction Exposed Thermocouple Junction Isolated Thermocouple Junction Grounded Thermocouple Junction…
RTD Standards
RTD Standards A resistance temperature detector or platinum resistance thermometer works on the principle that the electrical resistance of a metal changes in a significant and repeatable way when temperature…
What is IEC 61508 ?
What is IEC 61508? IEC 61508 (previously IEC 1508) is a seven-part standard that defines specific direction and guidelines on the functional safety of electrical/electronic/programmable electronic (E/E/PES) safety related systems.…
Instrument Turndown Ratio
Instrument Turndown Ratio An important performance parameter for transmitter instruments is something often referred to as turndown or rangedown. “Turndown” is defined as the ratio of maximum allowable span to…
