Solenoid Valves

Solenoid valves are also available at SIO that come in various materials and specifications. Also called electrically-operated valves, these valves are automatic valves that will no longer need a professional to operate them manually. They function through the use of electromagnetic solenoid coils to alter the state of the valve from open to shut and vice-versa.

Solenoid valves are useful in applications that involve clean process media, like clean liquids, gases, and oils, that need to be managed. Basic on and off valves are the most used as several process lines only require flow/ no flow features. Solenoid valves are also useful in factories where there is no compressed air available.

You can depend on SIO to offer you the best solenoid valves that are compatible with an array of applications!

    What is a Solenoid Valve?

    A solenoid valve is a valve that allows fluid flow or shut off when it is electrically energized or de-energized. It converts electrical energy to mechanical energy, which results to the creation of a magnetic reaction as the electric current approaches the wire in the solenoid. The actuator of a solenoid valve is in the form of an electromagnet.

    The valve has an electric coil, called a solenoid, that has a ferromagnetic core in the center. The core is coined as the plunger. A magnetic field builds up to pull a plunger or pivoted armature against spring’s action when energized. The pivoted armature or plunger returns to its original state by the operation of a spring when it is de-energized.

    Valves manufactured by reliable solenoid valve suppliers are widely used in liquid and gas circuits. These valves can be applied in several operations like heating systems, industrial automation, swimming pools, compressed air technology, sprinkler systems, dental equipment, irrigation systems, washing machines, and even car wash systems.

    Solenoid Valve

    Source: Indiamart

    Solenoid Valves Features

    The solenoid valve acts as a mechanical component whose essential function is to control the fluid movement that is going to take place via the pipelines. Here are the notable features of the valve-

    High temperature and pressure-resistant

    SIO solenoid valves can tolerate a high range of temperature and pressure variation from minimum to maximum limits.

    Industry Standards

    SIO solenoid valves meet all the industrial standards and have GOST and ISO certifications. These valves go to the market only after a thorough test in our lab.


    Solenoid valves are very responsive. They can respond to as low as ten milliseconds.

    Restricted regulation accuracy

    Accuracy for regulation is limited. SIO solenoid valves can be found in two primary states - open and closed.

    Benefits Of Using Solenoid Valves

    Using solenoid valves is advantageous since it is very versatile in terms of use. The solenoid valves can run on low energy apart from being capable of efficiently sustaining the high flow of fluids. Solenoid valves are also very reliable since they are high pressure and temperature resistant.

    Pilot-operated solenoid valve

    Uses low energy

    It can be remotely operated. Since the solenoid valve is energy efficient, they use very little energy and function sustainably.


    It works well with AC as well as DC voltages, and challenging tier initial installation cost is high, but overall the solenoid valve is economical for the long run.

    Prompt reaction

    It can operate efficiently in extreme temperatures. Not only does it work efficiently with the extreme hot medium, but it also does not get damaged due to the freezing medium.


    It can be operated both vertically as well as horizontally. Therefore, it is very versatile in application, and since it can be placed in any manner, it prohibits any kind of leakage.

    Standard And Specification Of Solenoid Valves

    soleniod valve

    You must consider the following factors before you go ahead to purchase a solenoid valve:

    Type of media

    Before buying solenoid valves, it is vital that you decide what you would use the solenoid valve for. If you know the media type, you can choose the material for your solenoid valve better.


    Solenoid valves are available in various materials such as PVC, Nylon, Nickel, Brass or Stainless Steel. All these materials react differently with different media.

    Number of ports

    Depending on the number of ports and type of application, you need to make up your mind on which solenoid valve you need to use. The number of ports will determine the ease of material passage.

    Type of operation

    Keeping in mind the type of operation. To fulfill solenoid valve plumbing operations, you need to find valves working under austere conditions. For example, the two-way valves composed of PVC or nylon can be used.

    Common Solenoid Valve Applications

    The main application of solenoid valves is that they are used to check the flow of fluids. They are generally installed in hydraulic and pneumatic systems and are used to control large industrial valves, fluid of power motors, and industrial cylinders. They have also found their way in irrigation in the form of automatic sprinklers.

    Air Compressors

    The compressor is controlled by the electric motor, and it absorbs air that is filtered in nature. This filtered air undergoes compression and is then transported to a refrigerator, followed by reaching a tank. Now, the energy travels via the high pressure solenoid valve through a coil that supplies energy to the valve. As soon as this tank reaches its expected pressure, the system stops operating immediately.

    Press Safety valves

    This steam solenoid valve uses two 3-way solenoid valves. When devoid of energy, the pressure inlet of the valve which connects the port of the cylinder to the exhaust port is blocked. Pressure gauges are used to compound the pressure so that the pressure amount in the pipes is controlled. Two solenoid valves are regulated simultaneously by a panel of an electronic system.

    Dentist Chairs

    The dental chairs need to be equipped with critical dental tools as well as an adjustable lamp. 2 solenoid valves regulate the height of the chair. The functions of this chair are required to be automatic, which can be controlled via an easily operated console. The chair can be lifted by a hydraulic cylinder system that uses the medium of oil.

    Coffee in cartridge dispensers

    These dispensers use a two 3-way steam solenoid valve. These valves prohibit the water from passing via the vibrating pumps. It is these vibrating pumps that provide supply to the hydraulic actuator. Finally, the tank transfers the water to the boiler. This boiler contains boiling water and also consists of a thermostat that keeps on regulating the temperature.

    Car washing systems

    The care wash systems, which are of self-service in nature, are seen as an innovation. These systems function to clean and polish vehicles and do it in a better manner than their car washing traditional system counterparts. These systems use a high pressure solenoid valve and are used in cleaning scooters, caravans, camper vans, small boats, and all-terrain vehicles with detergent.

    Automatic hot drinks Dispenser

    Dispensers are found chiefly in cafeterias or offices, which provide people coffee, tea and various hot drinks almost instantly. These dispensers use solenoid valves. When the activities of mixing the beverage powders are done within the vending machine, it is then that the solenoid valve starts its work. First, it adds hot water to the mixture at an angle of 90-95 degrees

    Vibrating Feeders

    The circular vibrator consists of a vibrating base. This is a separate controller that runs on electricity and sets the vibration limit. In addition, there is a container that can be of a cylindrical, conical or stepped shape. Finally, there is a spiral guider found within the inside of the container. This guider allows small parts to proceed towards the linear feeder in ascending order.

    Industrial ironing boards

    This appliance consists of a vacuum which is placed below the table, a form board of sleeve as well as iron. Here, the solenoid valves consist of a flow regulator that is present as a screw or knob, which permits the operator to keep a check on the pressure and quantity of steam that is required to iron the clothes.

    Solenoid Valve Factory

    4-way solenoid valves

    SIO is one of the most trusted solenoid valve suppliers when it comes to service since we provide you with solenoid valves of high precision. At SIO Valves, we use ultrasonic cleaning machines, which assures minimal clogging. This is followed by spraying, which ensures the protection of these valves.

    With us, you don’t have to worry about faulty materials because our valve production involves a multiple-step quality control process. In addition, at SIO valves, we make use of modern technology, which assures the products a better finishing.

    What Are the Different Types of Ball Valves?

    Solenoid valves can be categorized into a number of types depending upon their uses and characteristics. So the various solenoid valve types are

    Solenoid valves by circuit functions

    2/2 way solenoid valve

    2/2 way solenoid valve is the poppet or diaphragm style and is limited to on and off functions for use since they lack the exhaust port. 2/2-way solenoid valves are versatile in many industries.

    3/2 way solenoid valve

    This is referred to as the two positions and 3 ports valve. When the valve is devoid of energy, port one is considered the inlet; the second port is considered the outlet, and the third or the blocked port is the exhaust port.

    5/2 way [Sol/Spring or Sol/Sol]

    The extra 2 ports in this valve type are used as pneumatic cylinders double acting pilot pneumatic actuators. In addition, this solenoid valve produces a single coil that enables the return of spring or two solenoid coils.

    5/3 way [Sol/Sol-ABP or Pressure Held]

    Composed of 2 coils, these valves consist of 3 positions along with 5 ports. 2 of the positions of this valve have similar functions as that of the 5/2 way valves. Still, there is a different operation assigned for the third position.

    Solenoid valves by type of operation


    Direct acting solenoid valves

    These valves use a simple principle. It is the orifice via which the fluids flow, and there is a plunger accompanied by a rubber gasket that closes this valve via a minor spring. This valve is used in applications where flow rates are low.

    Semi-Direct Operated Solenoid Valve

    Semi direct operated solenoid valves

    This valve is used to control the passing of gases or liquids via the valve. When it is devoid of power, the plunger goes down, sealing the valve and preventing any liquid or gas flow. These valves are used in applications which work at diverse pressure rates.

    Indirect Operated Solenoid Valve diagram

    Indirect operated solenoid valves

    This valve are those solenoid valve types that can either be normally open or closed, depending on how the valves have been piped up. These valves are employed in applications that have a sufficient difference in pressure as well as a high flow rate.

    Direct-acting 2 way plunger solenoid valves

    These are one of the most common direct-acting fluid solenoid valves. This valve has a rugged but efficient working principle. The application of this valve is to open the path for the medium so that it can pass from the inlet to the outlet port.

    Direct-acting 3 way plunger solenoid valves

    These valves have two seats and 3 ports. A single valve seat remains permanently closed, whereas the others remain permanently open. This valve is employed in applications where compressed air can be mixed and distributed so that it can pilot the pneumatically larger driven valves.

    Direct acting pivot solenoid valves

    Once the coil switches on these valves, it induces the movement of the core in a rotational or lateral manner. They are used in applications where vacuum or corrosive and contaminated fluids are controlled and regulated.

    Direct acting rocker Solenoid Valves

    Known for their superior cycle life, they are created with or without the presence of a diaphragm. As a result, these valves can efficiently control the flow of aggressive fluids and hence are used in stand-alone valves or the or valves that are servo-assisted.

    Direct Acting flipper solenoid valves

    This solenoid valve moves via an adjustable sealing system located within two seats opposing each other. Known for their magnificent cycle life, they come in integration with the diaphragm. These are used in hazardous or non-hazardous situations for piloting the valves that are pneumatically actuated.

    Direct acting 2 way solenoid valves

    These valves contain an outlet as well as an inlet port. Since the electromagnetic force exceeds the combined force of the dynamic pressure as well as the spring pressure of the medium, these valves are used in applications that operate on electromagnetic forces.

    Internally piloted solenoid valves

    These valves are generally fitted with 2 or 3-way pilot valves. There is a piston or a diaphragm that acts as the seal for the main valve seat. These valves are used for upgrading to higher pressure via large orifices.

    Internally piloted 2-way solenoid valve

    This type of piloted solenoid valves need to be operated at differential pressure for best performance. Therefore, these valves are used in applications that work on the minimum difference in pressure.

    Internally piloted multi-way solenoid valve

    The main function of this valve is actuating the cylinders, which are double-acting in a proper way. This valve consists of 4 ports and has been designed primarily for being applied in hydraulic and pneumatic circuits.

    Externally piloted Solenoid valves

    In these valves, there is the use of a certain independent pilot source that is external. This external pilot is used to control the fluctuating pressure for the purpose of actuation. These valves cease to function when energy is passing through them.

    Solenoid valve by number of ports

    2-way solenoid valve

    2-way solenoid valve

    2-way solenoid valves are also known as closed valves and have two pipe connections. These valves are employed in applications that require the opening or closing of ports at a time.


    3-way solenoid valve

    These valves are also called the open solenoid valve. In this valve, when energy is allowed to pass through the valve, the plunger prohibits the orifice port from operating. These valves are used in applications that require exhaustive operating pressure, like coffee or dishwasher machines.

    4-way solenoid valves

    4-way solenoid valve

    These valves have 4 to 5 pipe connections and are known as ports. The mechanism of this valve differs from when it gets the energy to the situation where it is devoid of energy. The four-way solenoid valve is generally seen to operate actuators or double-acting cylinders.

    3-way normally open solenoid valve

    This valve has three pipe connections, out of which two orifices are present. The three pipe connections are the cavity port, orifice port and end port. These valves are used in devices where the fluid travels via the cavity port to the end port.

    3-way normally closed solenoid valves

    This valve has one orifice, and a stop port opened. These valves are employed in devices where the fluid enters via the cavity port and leaves via the stop port.

    3-way directional control solenoid valve

    These valves generally consist of 3 pipelines which are referred to as ports. When in a position where energy is not flowing via this valve, the cavity and the orifice are seen to be open. These valves are used for operating double-acting actuators or cylinders.

    Components of a Solenoid Valve

    The body of the valve is where the solenoid valve is connected with the pipeline to regulate the flow of the fluid. But since solenoid valves are automatically actuated, they are connected directly to the body.

    The inlet port is where the fluid enters to flow through the automatic valve. As the fluid passes to the inlet port, the flow can proceed to the other stages of the valve operation.

    The outlet port is where the fluid enters to leave after passing through the valve. The solenoid valve takes control of the fluid flow from the inlet to the outlet ports. A fluid in the whole process eventually enters the outlet port.

    The solenoid is considered the body of the solenoid coil. With its metallic finish and steel components, the solenoid is cylindrically shaped and hollow. The coil is located on the upper part inside the solenoid valve.

    The solenoid is composed of several turns of coil, also called coil windings, wound up around the ferromagnetic material in the valve. The shape of a hollow cylinder is formed by the coil which is covered by steel. This coil has a hollow part where a plunger or piston is located. The spring controls the motion of the piston.

    Source: Bright Hub Engineering

    Lead wires are external connections in the solenoid valve, which are directly connected to the electrical supply. These wires serve as the pathway for the current to pass through the solenoid valve. Once the valve is energized, the current flows through the lead wires to the valve. When the valve is in the de-energized state, the fluid flow stops.

    The plunger or piston is the cylindrically shaped solid metallic part that is located in the hollow portion of the solenoid valve. When the electrical energy passes through the solenoid valve, the formation of the magnetic field happens inside the hollow space.

    Once the field has been created, the plunger moves in a vertical motion. It remains in its current place once the supply of electrical current stops and the creation of the magnetic field ceases.

    Because of the spring force that pushes against the magnetic field, the plunger is in movement inside the space. The magnetic force created in the hollow space of the solenoid valve causes the plunger to move, but the spring prevents the movement. The spring force against the generated magnetic field makes sure that the plunger is located in the area where the current flow is blocked from passing through the valve.

    The spring plays a crucial role inside the hollow space. First, the spring maintains the favored position of the plunger instead of letting the plunger fall down because of gravity once the flow of the current through the solenoid valve is blocked. Second, the spring stops the plunger from moving because of the flow of fluid force in the valve body. The plunger moves up when the liquid is available and goes down when the liquid flow stops when the spring is not around. In order for the piston to take control of the fluid, the spring should be present to force it.

    This is where the fluid flows in the solenoid valve. The orifice connects the inlet port and outlet port. The fluid flow that starts in the inlet to the outlet happens in the orifice.

    In ordinary valves, the orifice is covered with the disc found at the bottom of the stem where the handle is connected. Thus, the handle controls the opening of the orifice. However, for solenoid valves, the plunger, which is controlled by the spring and the current that flows through the solenoid valve, opens the orifice.

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