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What is ESDV (Emergency shutdown Valve)? ESD valves are used to isolate the facilities in emergency situations. An ESD (emergency shutdown) valve is a valve fitted with a spring return actuator, allowing the valve to be closed by the actuator spring when…
Quality assurance is a term covering all matters relating to the quality of a product or service, separately or collectively. ISO 9000 describes quality control as part of quality management that is geared towards quality requirements. Difference between QA and QC: QA is…
Introduction Flow is an important physical quantity that needs to be controlled,monitored. There are so many flow measuring devices. lets discuss about Turbine flow meter. Working principle Turbine flow meter is used for translates the mechanical action of the turbine rotating in…
What is Solenoid Valve ? How it works ? Animation A solenoid is an electrical coil.When a battery is connected to the coil,a magnetic field is created.And pull the plunger or armature back.This opens the valve,allowing high pressure air to flow…
What is Direct Acting ? Direct acting means that valves uses a power supply to open and close. Power is transformed into magnetic force,in a plunger type valve,forces a plunger to move and open or close the valve seats. Other direct…
ELECTRICAL MOTOR DOL STARTER WORKING – ANIMATION Following States of DOL operation are shown in the animation 1.Starter at normal operation 2.Starting 3.Motor at overload condition 4.Normal Running 5.Stop DOL is used to start electric motors. Many types of electric motor starter…
Thermocouple Gauge Thermocouple gauge is a device used to measure low vacuum.Working of a Thermocouple GaugeIn Thermocouple Gauge a filament is heated by passing constant current through it.When gas molecule interact with filament heat is carried away.Therefor the temperature is directly depended on…
Pirani GaugePirani gauge is a device used to measure low vacuum in a pressure range from 0.5 Torr to 10−4 Torr. Working Principle and Construction of Pirani gauge Pirani gauge consist of two tungsten filaments,a power source and a volt meter or ammeter.One of the filaments is…
What is a Pressure Switch ? A pressure switch turns an electric circuit on or off at a preset pressure.This pressure is referred to as the setpoint of the switch. A bourdon tube,a diaphragm, or a bellows can actuate the switch. How…
Electric Motors There are many types of Electric Motors used for a variety of purposes in commercial industry. Motor DirectionOne critical task must performed prior to installing a motor is determining the motors rotational direction.If a motor is required to rotate in a…