What is Solenoid Valve
A solenoid valve is a type of industrial valve with specialized electro-mechanical controls that regulate the flow of liquids and gases. It is a fundamental automation component belonging to actuators and is not limited to hydraulic and pneumatic uses. Solenoid valves use an electromechanical magnetic field which opens and shuts the valve, making the valve a reliable option for pneumatic and hydraulic systems.
Benefits of Balancing Valves
Precise control
Solenoid valves are preferred for their precision and quick responsiveness. This property is crucial when handling air, a compressible fluid that changes its physical properties in a short time. Solenoid valves can respond to process changes, adjusting valve positions accordingly and facilitating seamless transitions in direction and flow rates of compressed air.
Quick responsiveness
Solenoid valves facilitate fast and reliable regulation and control of compressed air and gases. Using electromagnetic forces to activate these valves means they can change states (open to closed or vice-versa) instantly. The fast responsiveness is because of the compact and lightweight designs of valves.
Durability and reliability
Solenoid valves can provide dependable, long-term compressed air service. These valves use high-quality fabrication materials to withstand aggressive industrial environments without losing their technical capabilities.
Energy efficiency
Utilizing solenoid valves for compressed air service is one way of addressing energy consumption challenges in facilities. These valves have several desirable features making them consume low energy when controlling or regulating air flow through pneumatic systems.
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How a solenoid valve works is by controlling the flow of liquids or gases in a positive, fully-closed or fully-open mode. They are often used to replace manual valves or for remote control. Solenoid valve function involves either opening or closing an orifice in a valve body, which either allows or prevents flow through the valve. A plunger opens or closes the orifice by raising or lowering within a sleeve tube by energising the coil.
Solenoid valves consist of a coil, plunger and sleeve assembly. In normally closed valves, a plunger return spring holds the plunger against the orifice and prevents flow. Once the solenoid coil is energised, the resultant magnetic field raises the plunger, enabling flow. When the solenoid coil is energised in a normally open valve, the plunger seals off the orifice, which in turn prevents flow.
Most standard solenoid valves are designed to operate within temperature ranges of -10°C to 80°C (14°F to 176°F), although high-temperature models can withstand temperatures up to 200°C (392°F) or more. The operating pressure range typically spans from 0 to 10 bar (0 to 145 psi) for standard models, while high-pressure versions can handle pressures up to 100 bar (1450 psi) or higher.
A normally closed solenoid valve remains closed when there is no electrical power applied, meaning it prevents fluid flow in its default state. Conversely, a normally open solenoid valve stays open without power, allowing fluid to pass through. When power is applied to either type, the valve's state changes: a normally closed valve opens, and a normally open valve closes.
Wear protective equipment (i.e., insulated gloves and eyewear) to protect against shock hazards from the live voltage supplied to the solenoid during diagnosis.
Disconnect the solenoid from any electrical connections or wiring attached to it. Check the solenoid manufacturer's specifications to determine its supply voltage (AC/DC).
Connect the solenoid terminals to the required power source. For this, connect the positive terminal of the power source to one of the solenoid terminals and the negative terminal of the power source to the second terminal of the solenoid. This should bring continuity across its terminals.
Once the solenoid is connected to the power source, the circuit closes, and the solenoid should activate. There should be a click from the solenoid once the current is properly supplied. If there isn't a click, the solenoid coil is bad, and the solenoid needs to be changed. To diagnose the solenoid, use a multimeter to test the solenoid for its resistance and voltage.
Types of Solenoid Valve
Two-Way Solenoid Valves
Two-way or two-port solenoid valves are among the most common types available. In essence, they control one inlet and one outlet port. They work to open or close the valve whenever they receive an electrical activation signal. Two-way solenoid valves are sometimes called shut-off solenoids. They are available in both normally open and normally closed varieties, according to whether the application requires flow to be restricted or enabled under standard prevailing conditions.
Three-Way Solenoid Valves
Three-way or three-port solenoid valves have three input/output ports and two valve seals, one of which will always be open and one of which will always be closed in normal (inactive) mode. In response to an electrical input signal, the open/closed state of these two ports is reversed, allowing various solenoid valve operations to be controlled. Flow can thus be diverted between channels as required, in accordance with the way the port connections have been set up and connected within the larger pipeline system.
Direct Operated Solenoid Valves
Within the solenoid valve types outlined above, there exists a wide range of more specific operating types and functions. One of these is a direct-operated solenoid valve, sometimes called direct-acting. With direct operated solenoid valves, the energised solenoid acts directly on the valve-sealing piston or armature. Therefore, the valve's ability to restrict or enable flow depends on the rated power in other words, the physical strength of the component.
Pilot Operated Solenoid Valves
With pilot-operated solenoid valves, the opening or closing of the valve is powered by the energy stored in the build-up of pressurised fluid or gas. Pilot-operated solenoids can be internally or externally piloted. Internally piloted solenoid valves are used for high pressure systems, usually found in larger pipeline setups where pressure differentials do the bulk of the work to open or close the valve. Externally piloted solenoids rely on a third-party component, such as a spring or armature, to push or pull the valve/diaphragm, working in conjunction with the typically lower-pressure differentials commonly encountered in smaller pipelines.
5 Essential Factors to Consider in Choosing Solenoid Valve
Type of Medium
Solenoid valves are made from different materials. It can be plastic, steel, brass, and sometimes bronze or aluminum. These materials have different chemical properties and will resist corrosion differently. When choosing the type of solenoid valve to use, it’s essential that you consider the material that makes it and its compatibility with the media to be regulated.
Type of Environment
Depending on the application, a solenoid valve will be exposed to specific surroundings- some harsh and others mild. An irrigation solenoid valve, for example, is likely to be exposed to the tough outdoor conditions. That requires that it be made from materials that can withstand the environment. If looking for a sprinkler solenoid valve, you may want to choose one made from a sturdy and durable material such as metal.
Cost
Solenoid valves cost varies across models and brands. Several factors cause the differences, such as the material used, valve type, solenoid valve supplier rates, and more. Usually, valve manufacturers set own prices which can be high or low. The solenoid valve price you choose should be based on adequate information and research. High price tags mean quality materials that are also tougher. Go for that if looking for a top-class valve that will withstand tough conditions and last a long time.
Safety
This relates to the valve application, and how it will likely affect the set safety standards. Solenoid valves used to regulate beverages, for instance, need to conform to certain guidelines. If looking for a food liquid line solenoid valve, ensure the material is completely safe. This applies to booth the valve body and the seal or membrane. Stainless steel valves are the most recommended if fluids for human consumption is the type of media to be controlled.
Voltage
Solenoid valves exist as AC and DC valves. Lower DC voltage valves are safer when compared to AC valves. However, they’re less powerful. Unless large valve closing forces are required, a simple 12V solenoid valve would suffice. There are also powerful ones that used direct current, such as the 24-volt solenoid valve.
Application of Solenoid Valve
Water treatment
Solenoid valves are used in water treatment facilities to control the flow of chemicals, water, and wastewater. They help regulate the dosing of chemicals for disinfection and pH adjustment.
Oil and gas industry
Solenoid valve in oil and gas industry, solenoid valves are employed for various purposes, such as controlling the flow of crude oil, natural gas, or hydraulic fluids in pipelines and equipment.
Automotive industry
Solenoid valve in automation is used in various applications, such as controlling the flow of fuel, air, and hydraulic fluids in engines and transmissions. They are also used in automotive air conditioning systems to control refrigerant flow.
Pneumatic control systems
These valves are a fundamental component in pneumatic control systems used in manufacturing and automation. They control the flow of compressed air to actuate pneumatic cylinders, grippers, and other automation devices.
HVAC
Such devices are used in HVAC systems to regulate the flow of refrigerants, which is essential for maintaining proper temperature and humidity levels in buildings and equipment.
Medical manufacturing
Common uses of solenoid valves in medical equipment are custom valves for dialysis machines, anesthesia machines and ventilator systems. Pharmaceuticals and food processing use solenoid valves complying with hygienic requirements.
Components of Solenoid Valve
Nut
Holds the coil onto the valve and threads over the stop piece of the guide tube assembly.
Housing
Metal plate that covers the coil and helps complete the magnetic circuit created by the coil when energized.
Flux plate
Metal plate that helps complete the magnetic circuit with the housing.
Plunger assembly
Magnetic plunger that is typically 430FR SS, including the plunger seal and spring.
Coil
Element of the valve that when energized creates a magnetic field. Comprised of copper magnet wire spooled around a bobbin.
Guide assembly
Metal tube that internally houses the plunger, and acts as the external mounting post for the coil. The magnetic stop piece is welded to the top and the flange is welded to the bottom.
O-ring
Seal material that prevents the fluid from leaking external to the valve. This seals the guide tube flange to the valve body.
Body
The portion of the valve that has the plumbing connections and also the seat for the plunger to seal on.
What Happens When Solenoid Valve Goes Bad?
First and foremost, a faulty solenoid valve may cause the system it is a part of to malfunction or stop working altogether. This is because the valve may not be able to open or close properly, preventing the flow of fluid through the system. For example, if a solenoid valve in a washing machine fails, the machine may not be able to fill with water, preventing it from functioning properly.
Another common symptom of a failing solenoid valve is a leak. When a valve is no longer able to seal properly, fluid may begin to leak through the valve, causing a puddle to form around the valve or in the surrounding area. This can be particularly dangerous if the fluid is hazardous, such as gasoline or chemicals.
In addition to leaks and malfunctions, a failing solenoid valve may also produce unusual sounds or vibrations. This can occur as a result of the plunger inside the valve becoming stuck or not moving as it should, causing the valve to vibrate or make a buzzing sound.
If you suspect that a solenoid valve in one of your systems is failing, it's important to address the issue as soon as possible. Continuing to operate a system with a faulty valve can lead to more serious problems, such as damage to other components or even a complete system failure.
To diagnose a faulty solenoid valve, it's best to consult with a professional or a qualified technician. They can perform tests to determine whether the valve is functioning properly and replace it if necessary.
Maintenance Tips for Solenoid Valve
Disconnect power source
Disconnect the power supply and depressurize the system before performing any maintenance on the solenoid valve. This will prevent any accidental valve actuation during maintenance, which could result in injury.
Clean the internal parts
Use a wrench to remove the valve stem. This exposes the internal components of the solenoid valve, like the plunger, seal, spring, and o-ring . Wipe dust or debris from the valve body and the internal components using a clean cloth.
Test the valve
Once the solenoid valve is reassembled, ensure it functions correctly. Apply power to the valve and observe its operation. Check for any leaks, unusual noises, or other signs of malfunction. Read our article on solenoid valve testing for more details.
Repair or replace
After inspecting the solenoid valve for possible faults, it's time to determine if it's best to repair or replace a few components or replace the entire valve. If it's a small part to replace, like an o-ring, it's best to just replace the component and reassemble the valve.
Inspect the coil
Inspect the solenoid valve for cracks or burnout. Never power up the coil if it is not installed on the valve stem, as the high current can burn it. Also, moisture penetrating the coil can lead to valve failure. Check the connections to the coil for damage or corrosion.
Reassemble the solenoid valve
Once the necessary parts have been replaced and any buildup removed, attach the coil again and reinstall the solenoid valve, following the manufacturer's instructions for your particular application.Confirm the parts are correctly installed before switching on the power.
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