Solenoid Valve Functional Testing

Here we are discussing how to check or functional test a solenoid valve using instrument air supply.

Solenoid Valve Testing

*The air supply is connected to the Air Filter Regulator (AFR)

*Set the Required pressure in the AFR and connect the outlet of AFR to Solenoid Valve (SOV)

*Connect the outlet of Solenoid Valve to a Ball Valve.

*Connect a Pressure Gauge ( Test Gauge ) at the outlet of Solenoid Valve.

*Test Gauge’s purpose is to check the pressure in the outlet line depends on SOV energization.

*Ball valve used to stop the functional testing

Test Equipment:-

1.Air Filter Regulator

2.Digital Multimeter (optional)

3.24VDC Power Supply

4.Test Gauge

Typical SOV Test Set-up

Functional Testing Procedure :

a. Check the manufacturer datasheet/instrument nameplate. Confirm the solenoid valve voltage/current ratings (consider it is +24V DC Device in our example)

b. Check the solenoid valve port configuration (i.e. either N.C. or N.0) (Assume it is N.C. in our example )

c. The hook-up instrument as per the typical test set-up shown above.

d. Apply air specified set pressure to inlet port of valve and connect 24VDC to solenoid valve terminals.

e. Switch on power supply 24VDC, check the valve energize by monitoring the test gauge pressure (Pressure will increase)

f. Switch off the supply. and confirm the valve de-energized, check test gauge pressure again (Pressure will decrease)

g. Tabulate all results in the Check Sheet.

Comments

What is a Torbar? – Averaging Pitot Tubes

The Torbar is employed for flow measurement of liquids, gases, or steam in circular, square, or rectangular section ducts for large flow rates. The Torbar is an insertion type multi-port self-averaging primary sensor for flow measurement. Torbar TORBAR is a set of Pitot tubes mounted on a bar across the pipeline with no moving parts. An averaging Pitot tube is a technology, while TORBAR is a manufacturing brand name. There are several brands available in the market with VERABAR, ANNUBAR, etc. Averaging Pitot Tube Principle Purpose Averaging Pitot tube can be employed when the average velocity of the flow profile, rather than the velocity in a specific point in the cross-section is desired. Averaging Pitot Tubes Principle It measures the differential pressure between the static pressure tap and the tap of full pressure of a stream. Thus such magnitude of differential pressure is directly proportional to the square of the flow rate. Working The TORBAR is designed in such a way that ...

Ferrules and Cross Ferruling

Ferrules are identification labels provided for every wire terminations in an instrument, equipment, or electrical/instrumentation control panels. These tube-shaped sleeves can be inserted easily on each individual wire in a multi-core cable. In earlier days fixed digits/letters are used as ferrules, but now Instrumentation engineers/technicians prints out desired ferrules by using a ferrule printing machine. Typical Ferrule The numbers/ letters on the ferrules will be given as per the approved electrical hook up or loop diagrams. This helps technicians to easily identify a particular loop/wiring from a series of terminal blocks and to troubleshoot the desired terminal connection. Separate numbers on the ferrules distinguish the positive and negative polarities of wires, thus ensure the polarity protection of the instrument. Cross Ferruling As a wire is connected on its both ends, it is quite useful to use a cross reference method for wire identification. Unlike normal ferru...

Thermowell Insertion and Immersion Length

The thermowell is the industrial housing for temperature elements like RTD or thermocouple or temperature gauges. Thermowell is directly exposed to process fluid/media. Inside the thermowell, element/gauge is installed. Thermowell transfers the heat to the temperature element. Depending upon the element type, the fluid temperature can be known. So Thermowell protects the temperature element against harsh conditions and process fluid. It enables removal of the temperature element for replacement, repair, or testing without affecting the process system. Generally, thermowells are provided with all-temperature Elements like RTD or Thermocouple or temperature gauge. A few exceptions would be bearing RTD, skin type thermocouple, air duct thermometer, etc where thermowell is not applicable / required. When the thermowell assembly is inserted into the pipe, it is subjected to vibration. This vibration is caused by vortices to be generated alternately on either side of the thermowell. The...

TILI Automation

Search This Blog