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What is Solenoid Valve?
A solenoid valve is a device that controls the flow of liquids or gases using an electrical current. It's made up of a solenoid, which is an electric coil with a plunger in the middle, and a valve. When an electric current is applied to the coil, it creates a magnetic field that moves the plunger, opening or closing the valve.
Selection criteria of Solenoid Valve
Housing material
Determine valve housing material based on the chemical properties and temperature of the media, but also the environment the valve is in. Common options are brass, stainless steel, PVC, aluminum, and cast iron. Refer to Select the right housing material for your solenoid valve for more information.
Connection size
Ensure the solenoid valve's port sizes are the same as what the valve will connect to.
Connector
A solenoid connector is a device that plugs into a solenoid valve to supply it with electricity, and it helps protect the connections from dirt and water.
Voltage
Determine which voltage the power supply has and select a solenoid valve with a corresponding solenoid.
Seal material
Seal material should be selected based on the chemical properties and temperature of the media. NBR, EPDM, FKM (Viton), and PTFE (Teflon) are common options. Refer to select the right seal material for your solenoid valve for quick reference on chemical resistance of seal materials.
De-energized state
Determine if the application needs a normally open, normally closed, or bi-stable valve function.
Circuit function: Determine whether the application requires a 2 or 3-way solenoid valve.
Pressure
The valve must be able to withstand the maximum pressure required for the application. It is equally important to note the minimum pressure as a high-pressure differential can cause the valve to fail.
Temperature
Ensure that the valve materials can withstand the minimum and maximum temperature requirements of the application. Temperature consideration is also essential to determine valve capacity as it affects the viscosity and flow of the fluid.
Response time
The response time of a valve is the time needed for a valve to go from the open to the closed position or vice versa. Small direct-acting solenoid valves react much quicker than semi-direct or indirect-acting valves.
Approvals
Ensure that the valve is appropriately certified depending upon the application.
Degree of protection
Ensure the valve has the appropriate IP rating for protection from dust, liquid, moisture and contact.
Key Components of Solenoid Valves
Solenoid valves are composed of three key components, namely the coil, plunger, and body. The coil serves as an electromagnet that converts electrical energy into magnetic force, while the plunger, when magnetized, controls the flow of air, gas, water, or steam. The body encapsulates these parts, offering protection and stability. These components work seamlessly together to regulate the flow of fluids or gases in a variety of applications.
The Coil
The power source in a solenoid valve, the coil generates the essential magnetic field for valve operation. Understanding its characteristics, such as voltage and power consumption, is crucial for proper valve selection. The design and material composition of the coil impact the responsiveness and efficiency of solenoid valves, highlighting its significance in overall valve performance. Proper maintenance of the coil is essential for ensuring reliable valve operation.
The Plunger
The plunger is the moving part responsible for regulating fluid flow in a solenoid valve. Assessing its durability and performance requires an understanding of its design and material composition. Precision and responsiveness of solenoid valves rely heavily on the plunger's design and functionality. Achieving accurate fluid control depends on the critical alignment and movement of the plunger. The dynamics of the plunger's operation directly impact the overall effectiveness of solenoid valves.
The Body
The structural support and fluid containment of a solenoid valve are provided by its body, housing all internal components. Assessing the compatibility with different fluids and environments involves understanding the construction and material properties of the valve body. The durability and reliability of solenoid valves are directly influenced by the design and integrity of the body. Preventing leaks and ensuring consistent performance requires proper maintenance and inspection of the valve body. Design considerations for the body include port configuration, mounting options, and environmental sealing.
How Does A Solenoid Valve Function?
Open And Close Flow
The most common function for a solenoid valve is to open and close a flow path. For example, a solenoid valve in a dishwasher will be in the closed position when the dishwasher is off in order to conserve water. When the dishwasher is turned on, the valve will open for the period of operation during which water needs to flow onto the kitchenware.
Control Flow Direction
A solenoid valve may also be used to control the flow path or direction that a fluid travels. When used for this purpose, the solenoid valve will typically have multiple inlet or outlet ports. Energizing the coil helps to change which ports are open so that the fluid travels through an alternate channel. For example, the valve can be used to mix two fluids together in a specific ratio. In this scenario, the valve will have two inlet ports, or one for each fluid. The outlet port will be connected to the mixing chamber. When the valve is de-energized, fluid “A” will travel into the mixing chamber. When the valve is energized, fluid “B” will travel into the chamber. The ratio of each fluid can be altered by varying the length of time that the valve is energized.
Control Flow Volume
When precise flow volume is required, a solenoid valve may be operated to open and close during defined periods of time to allow a specified volume of fluid to flow through the valve. In printers, for example, a solenoid valve can be used to dispense droplets of ink. In these systems, the inlet pressure must remain constant to ensure that the flow volume over a period of time is consistent. When a high degree of accuracy is needed, other factors such as fluid properties and environmental conditions can also impact flow rate.
Regulate Flow Rate
A solenoid valve can function to control the flow rate of a liquid. When used for this purpose, the valve may be able to operate quickly enough that varying the frequency at which the valve is energized also varies flow rate through the valve body. This technique is commonly referred to as Pulse Width Modulation (PWM). Solenoid valves can also be designed to operate in a non-binary position in which the valve is neither fully open nor fully closed. These valves are commonly called proportional valves. By adjusting the valve components, overall restriction of the valve changes and meters flow. For instance, oxygen concentrators use solenoid valves to vary the flow rate of oxygen to a patient based on an individual’s need.
Types of Solenoid Valve Operations
Direct-Acting
In this type of solenoid valve, static pressure forces increase with the orifice size. A larger orifice requires a stronger solenoid action and, consequently, a stronger magnetic field to handle the increased static pressure. Therefore, for a given fluid pressure, larger flow rates necessitate larger solenoids. As a result, fluid pressure and flow rate are directly proportional to the size of the solenoid. This type of solenoid valve is typically used for applications with small flow rates and operating pressures.
Internally Piloted
Internally piloted solenoid valves are used for high flow rate and high pressure applications. In these valves, pressure across the valve controls its opening and closing. An orifice or equalizing hole is typically installed for this purpose. In the usual design, the core blocks the flow through the orifice when the valve is closed, causing fluid to pass through the orifice and build up pressure on both sides of the diaphragm. This creates a shut-off force due to the larger effective area on top of the diaphragm. When the valve is opened, the core uncovers the orifice, relieving the pressure on top of the diaphragm. The line pressure then forces the valve open.
Externally Piloted
This type of valve operates on a similar principle to internally piloted valves, but it uses fluid from an external source to actuate the valve. It incorporates an additional port to integrate a separate fluid circuit for this purpose.
Both internal and external piloted solenoid valves are referred to as indirect or servo-assisted valves, where the primary actuating force is derived from the differential pressure between the upstream and downstream sides of the valve.
Semi-direct Acting
Semi-direct acting solenoid valves integrate the principles of both direct and indirect acting valves. In addition to the magnetic force from the solenoid, the pressure differential across the valve also aids in opening or closing the valve. When the plunger is actuated, it lifts the diaphragm to open the valve, simultaneously uncovering an orifice that relieves pressure on top of the diaphragm. When the plunger closes this orifice, pressure builds up on top of the diaphragm, causing the valve to close.
Advantages and Features of Solenoid Valve
Safety
Internal and external leakage is a factor endangering safety. Other automatic control valves usually extend the valve stem, and the electric, pneumatic and hydraulic actuators control the rotation or movement of the valve core. This will solve the leakage problem of the long-term action valve stem dynamic seal.
A. Internal leakage
The torque control of the electric valve is not easy, which is easy to cause internal leakage, or even break the valve stem head; The structure of the solenoid valve is easy to control internal leakage until it drops to zero.
B. Leakage
The solenoid valve is completed by applying electromagnetic force to the iron core sealed in the magnetic isolation sleeve. There is no dynamic seal, so the external leakage is easy to be blocked. To sum up, the solenoid valve is particularly safe to use, especially for corrosive, toxic or high and low-temperature media.
Cost Performance
A. The solenoid valve itself is simple in structure and low in price. It is easier to install and maintain than other types of actuators such as control valves.
B. What is more significant is that the automatic control system is much simpler and the price is much lower.
C. Because the solenoid valve is controlled by the switch signal, it is very convenient to connect with the industrial control computer. In today's era when computers are popular and prices are falling sharply, the advantages of solenoid valves are even more obvious.
Energy-saving Applicability
A. The response time of the solenoid valve can be as short as several milliseconds, and even the pilot-operated solenoid valve can be controlled within tens of milliseconds. Because of its own loop, it is more sensitive than other automatic control valves. A properly designed solenoid valve coil has low power consumption and is an energy-saving product.
B. It can also automatically maintain the valve position with only triggering action, and it does not consume electricity at ordinary times. The size of the solenoid valve is small, which saves space and is light and beautiful.
Scope Of Application
The progress of solenoid valve technology is also focused on how to overcome congenital deficiencies and how to better play to the inherent advantages. It is widely used, and the solenoid valves have various models. Although they have congenital shortcomings, their advantages are still very prominent. Therefore, they are designed into a variety of products to meet various needs.
Certifications
Our Factory
In order to meet the individual needs of customers, our company has a mold department and injection workshop, can provide customized product services. We have independent development and manufacturing capabilities, from product design to manufacturing, we can follow up the whole process to ensure that products are produced according to customer requirements.
In order to ensure the quality and delivery time of products, our company has an assembly workshop and a fully automatic assembly workshop. Our assembly shop is efficient for product assembly and quality inspection. Fully automated workshops achieve efficient and precise production processes through automated production lines, ensuring product quality and delivery cycles.
FAQ
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