Dc valve solenoid

Types of DC valve solenoids

A DC solenoid valve works like a tap to control the gas or liquid flow and is made of the following main components:

• Coil: The moving part has insulated copper wire wrapped around it. A magnetic field is created when electrical current flows through the coil.
• Plunger: A movable metal part of the solenoid valve is usually cylindrical and fits the coil closely. The plunger is pushed by the magnetic field to open or close the valve.
• Spring: The spring pushes the plunger back to its original position when the electrical current stops flowing.
• Body: The valve body's components include an orifice that allows gas or liquid to flow and a seat for the valve to close tightly.
• Guide: The guide ensures the plunger moves in a straight line within the valve body.

An electromagnetic DC solenoid valve works like normally open, normally closed, or direct flow type valves. In a normally closed solenoid valve, the plunger sits on the valve seat to stop flow. It will move upward from the seat to allow flow when the coil generates a magnetic field by allowing current to flow through it. The force of the magnetic field pulls the plunger and overcomes the spring force. Normally open solenoid valves work in the exact opposite way. They are designed to allow flow until the coil generates a magnetic field. Solenoid valves can also have direct path or motion or an indirect way. In the direct type, the valve seat is directly pushed by the plunger to allow or stop flow. The indirect type has the plunger opening another poppet, which then allows the flow to go through the valve seat.

Specifications and Maintenance

The specifications of solenoid valves can differ depending on their designs and applications. Some key specifications are as follows:

• Working Voltage: The working voltage of the solenoid valve is different based on different types, which are usually 12V, 24V, 110-120V, etc.
• size: The sizes of solenoid valves are various, from 1/4'' to 2'' or 1/2, depending on the applications. They can fit different sizes of pipelines.
• Threading: Solenoid valves own various threading, such as NPT, BSPT, BSPP, etc. They are designed to match different pipelines or equipment connections.
• Media: Solenoid valves can control different media, such as water, gas, oil, air, etc. They are designed to suit different kinds of working fluids.
• Pressure Class: Solenoid valve pressure classes vary, from PN10 to PN40 or others. The pressure classification is designed to comply with specific pressure conditions and working environments.
• Body Material: It can be copper, stainless steel, or other materials. It is solid enough to bear pressure and corrosion.

It is also essential to maintain the performance and service life of the solenoid valve properly.

• Cleaning: Clean the solenoid valve surface with a soft cloth and neutral detergent. Avoid using corrosive cleaning agents to clean the solenoid valve to prevent damage to its surface.
• Check the connections: Regularly check the connection between the solenoid valve and the pipeline or device to ensure firm and reliable connections without leakage or loose issues.
• Lubrication: If applicable, apply some lubricants to the solenoid valve to ensure its smooth operation.
• Avoid impact and vibration: Avoid impact and constant vibration during using the solenoid valve, preventing damage and malfunction of the solenoid valve operating system.
• Observe operating environment requirements: Ensure the solenoid valve operates within the specified environmental parameters, such as temperature and humidity, preventing damage to the valve due to exceeding the environmental limitations.

Application Scenarios of DC Valve Solenoids

• Automobiles

  In an automobile, the functioning of various crucial components is dependent on the presence of DC solenoid valves. For instance, they assist in the maintenance of tire pressure by way of functioning in the tread valve. They also help in ensuring the proper working of the system of ignition, fuel supply, and EGR (Exhaust Gas Recirculation). In addition to this, the DC mini solenoid valves are utilized in the automatic washing machines DC solenoid valve control system for managing the inflow of water. The solenoid valve facilitates the entry of water in the machine, thus ensuring the proper working of the cleansing procedure.

• Industrial Applications

  In the field of industry, a great variety of pneumatic and hydraulic systems rely heavily on DC solenoid valves. Such systems generally make use of compressed air or any other fluid to carry out function various machineries and equipment. Examples can include machinery for the manufacturing of automobile parts, as well as industrial assembly lines or robot arms.

  One more instance of an industrial application of AC/DC solenoid valves can be the automation of valves of regulation and on-off in the refrigeration industry. Such valves control the flow of refrigerant in various appliances and machines, thus making them an integral part without which the air conditioning would not work.

• Robotics and Automation

  In the field of robotics and automation, DC solenoid valves are quite significant. This is because they are the ones that usually carry the control functions. The role of controlling the flow and pressure of fluids in robotics is often carried out by DC solenoid valves. This is achieved by means of robotic systems engaged in tasks such as lifting, gripping, or moving. Furthermore, such valves also realize the function of controlling the hydraulic cylinders in the field of robotics. They also play a critical part in directing the flow of Pneumatic actuators. This makes the robotics valve control function possible, thus permitting the robots to carry out the task with precision.

  It is interesting to note that the valve control function of the DC solenoid is not manual, but rather automatic. This is to say that the pressure and flow of air are not controlled physically by hand, but rather automatically, possibly by a computer program. As a result, the functioning was more precise, faster, and feasible to be repeated many times.

How to choose DC valve solenoids

When selecting a solenoid valve for a specific application, it's crucial to take a comprehensive approach by considering the demands of the system. Analyze the needs of the system to ensure appropriate coupling between the solenoid valve and the application environment. Check the working media, voltage, pressure, temperature, flow rate, and installation size of the valve.

A suitable material is essential for the solenoid valve to function correctly and endure various pressures and temperatures in different environments. The valve must also be resistant to corrosion from the working medium. There are numerous options for the power supply of solenoid valves, including AC/DC transformer power, car battery, solar power, and more. The pressure difference between the upstream and downstream sides of the solenoid valve must also be considered since it influences the flow characteristics and control behavior of the valve.

Temperature and humidity tolerance of the solenoid valve is also another significant element. In high-temperature environments, valves constructed from materials with high-temperature resistance and low-temperature brittleness are essential. The ability to function in humid conditions is determined by the valve's ingress protection (IP) rating. A solenoid valve with at least an IP65 rating should be used for dusty and wet locations to prevent water and dust intrusion.

Flow rate is also an important feature. The amount of current flowing through the solenoid coil is directly proportional to the magnetic force generated, which is responsible for the valve's opening and closing time. Different types of solenoid valves are available for various applications. Generally, the dynamic seal used in solenoid valves is fluororubber, which possesses both high and low-temperature resistance, ensuring a tightly sealed structure. However, providing a customized dynamic seal for a specific application is doable if distinct sealing requirements are necessary.

DC valve solenoid Q & A

Q: Is there any difference between a 12v and 24v solenoid valve?

A: In the way they function, there is no difference between a 12V and a 24V solenoid valve. They are simply designed to function with different voltages. The specifications are equivalent to the DC voltage current.

Q: How do DC solenoid valves of different sizes compare?

A: Generally, the size of the solenoid valve does not affect the functioning or performance of the valve. However, the size may affect the capability of the valve to handle a particular application. They are likely to have different pressure settings and flow.

Q: Can solenoid valves be repaired?

A: In most cases, solenoid valves cannot be repaired. Once they are damaged, the only thing that can be done is to replace them with new ones. Fortunately, the solenoid valve is not very expensive, and replacements are easy to find.

Q: How long do solenoid valves last?

A: Provided the solenoid valve is not exposed to harsh chemicals and its pressure setting is within normal limits, it can last for a decade or more. Daily use applications may wear the valve out faster, making it necessary to replace it every two to three years.