Shanghai Weimili Rexroth solenoid valve in stock

German ReXROTH solenoid valve

A solenoid valve controller is a device that uses intelligent control technology to control solenoid valves. Its main function is to meet the automatic control requirements of the electromagnetic valve control system, and to achieve intelligent control and monitoring of the system by achieving a certain level of hydraulic control.

Principle of Electromagnetic Valve Control

The control principle of solenoid valves is to convert external electrical signals into mechanical motion through electromagnetic drive devices. The specific operation is as follows:

When powered on: When the electromagnetic coil is powered on, it will generate magnetic force on the stator, forming a spring coupled switch. At this point, the stator transitions from the disconnected state to the closed state, causing the valve to change from the closed state to the open state.

When the power is disconnected, the electromagnetic coil loses its magnetic force and the valve will transition from the open state to the closed state. At this point, the magnetic force of the electromagnetic coil disappears, and the valve is subjected to the action of the spring, closing to block the flowing medium.

Working principle of solenoid valve controller

The solenoid valve controller adopts intelligent control technology, and its working principle is as follows:

1. Signal input: The solenoid valve controller receives external control signals, which can be manual control signals, timing control signals, sensor control signals, etc.

2. Signal processing: The solenoid valve controller processes and analyzes the input signal to determine the valve state and action requirements that need to be controlled.

3. Signal output: The solenoid valve controller sends command signals to the solenoid valve through the output interface based on the processing results to control the opening and closing of the valve.

4. Feedback control: The solenoid valve controller can detect the status and working condition of the control system through sensors, and send feedback signals to the controller for feedback control, in order to achieve intelligent monitoring and control functions of the system.

Application scenarios of solenoid valve controllers

Electromagnetic valve controllers are widely used in hydraulic systems, water supply systems, air conditioning systems, water supply and drainage systems, and petrochemical industries. Its main function is to control the flow rate, pressure, and direction of fluids, achieving automation and intelligent control of the system.

Advantages of Electromagnetic Valve Controllers

The solenoid valve controller has the following advantages:

1. Precise control: The solenoid valve controller can achieve precise valve control according to requirements, ensuring the stability and safety of the system.

2. Fast opening and closing: The solenoid valve controller has the characteristic of fast opening and closing, which can efficiently control the flow of fluid medium.

3. Automatic control: The solenoid valve controller can achieve automatic control of the system, reduce manual intervention, and improve work efficiency.

4. High reliability: The solenoid valve controller adopts reliable control technology and components, with high reliability and anti-interference ability.

5. Energy saving and environmental protection: The solenoid valve controller can adjust the flow rate and pressure of the medium as needed, achieving energy saving and reducing energy waste.

summary

A solenoid valve controller is a device that uses intelligent control technology to control solenoid valves. Through the principle of electromagnetic drive, the solenoid valve controller can achieve control over the opening and closing of the valve. Its working principle includes signal input, signal processing, signal output, and feedback control. The solenoid valve controller has the advantages of precise control, fast opening and closing, automatic control, high reliability, and energy conservation and environmental protection. It has a wide range of applications in hydraulic systems, water supply systems, air conditioning systems, and other fields.

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How should solenoid valves be selected? Interpretation of the structural principle of solenoid valve

1. External leakage is blocked, internal leakage is easy to control, and safe to use

Internal and external leakage is a factor that endangers safety. Other self-control valves usually extend the valve stem and control the rotation or movement of the valve core through electric, pneumatic, or hydraulic actuators. All of this needs to solve the problem of long-term leakage of valve stem seals; Only solenoid valves use electromagnetic force to seal the iron core inside the magnetic isolation sleeve, without dynamic sealing, so external leakage is easily blocked. Electric valve torque control is not easy, which can easily cause internal leakage and even break the valve stem head; The structural type of solenoid valve is easy to control internal leakage until it is reduced to zero. So, the use of solenoid valves is particularly safe, especially suitable for corrosive, toxic, or high and low temperature media.

2. Simple system, easy to connect to industrial control computer, low price

The solenoid valve itself has a simple structure and low price, making it easier to install and maintain compared to other types of actuators such as regulating valves. More significantly, the self-control system composed is much simpler and priced much lower. Due to the fact that the solenoid valve is controlled by switch signals, it is very convenient to connect with industrial control computers. In today's era of widespread computer use and significant price reductions, the advantages of solenoid valves are even more apparent.

3 actions, low power, lightweight appearance

The response time of solenoid valves can be as short as a few milliseconds, and even pilot operated solenoid valves can be controlled within tens of milliseconds. Due to its self-contained circuit, it responds more sensitively than other self-control valves. A well-designed solenoid valve coil has low power consumption and is considered an energy-saving product; It can also automatically maintain the valve position by triggering the action, without consuming any electricity during normal operation. The electromagnetic valve has a small external size, which saves space and is lightweight and beautiful.

4. Limited adjustment accuracy and applicable medium

Electromagnetic valves usually have only two states: on/off, and the valve core can only be in two extreme positions, which cannot be continuously adjusted. (There are many new ideas trying to break through, but they are still in the experimental stage) Therefore, the adjustment accuracy is still limited to a certain extent. Electromagnetic valves have high requirements for the cleanliness of the medium, and are not suitable for media containing particles. If impurities are present, they must be filtered out first. In addition, viscous media are not suitable, and the viscosity range of media suitable for specific products is relatively narrow.

5 models are diverse and widely used

Although solenoid valves have inherent shortcomings, their advantages are still very prominent, so they are designed into a variety of products to meet different needs and have a wide range of applications. The progress of solenoid valve technology also revolves around how to overcome inherent shortcomings and better leverage inherent advantages.

Selection of solenoid valve

1. Economic viability

There are many solenoid valves that can be used interchangeably, and products should be selected during the selection process.

2. Security

Generally, solenoid valves are not waterproof. If conditions do not allow, please choose waterproof types. The factory can customize them. The nominal pressure of the solenoid valve calibration must exceed the pressure inside the pipeline, otherwise the service life will be shortened or other unexpected situations may occur.

For corrosive liquids, all stainless steel type should be selected, and for highly corrosive fluids, Plastic King (SLF) solenoid valves should be used. Explosive environments require the use of corresponding explosion-proof products.

3. Reliability

Electromagnetic valves are divided into two types: normally closed and normally open; Generally, the normally closed type is selected, which opens when powered on and closes when powered off; But when the opening time is long and the closing time is short, the normally open type should be selected.

Life testing is generally a type testing project in factories. To be precise, there is no professional standard for solenoid valves in China, so caution should be exercised when selecting solenoid valve manufacturers. When the action time is short and the frequency is high, the direct action large caliber is generally selected and the fast series is chosen.

4. Applicability

The fluid in the pipeline must be consistent with the medium calibrated in the selected solenoid valve series model. The temperature of the fluid must be lower than the calibration temperature of the selected solenoid valve. Electromagnetic valves allow liquid viscosity to generally be below 20CST, and if it exceeds 20CST, it should be noted.

When the working pressure difference and pipeline pressure difference are less than 0.04MPa, direct acting and step-by-step direct acting types such as ZS, 2W, ZQDF, ZCM series should be selected. When the working pressure difference is greater than 0.04MPa, a pilot operated (differential pressure) solenoid valve can be selected, and the working pressure difference should be less than the calibration pressure of the solenoid valve.

Generally, solenoid valves work in a one-way manner, so attention should be paid to whether there is a reverse pressure difference, and if a check valve is installed.

When the fluid cleanliness is not high, a filter should be installed in front of the solenoid valve. Generally, solenoid valves require good cleanliness of the medium. Pay attention to the flow aperture and connecting pipe aperture. Generally, solenoid valves are only controlled by two switches; If conditions permit, please install a bypass pipe for easy maintenance; When there is water hammer phenomenon, it is necessary to customize the opening and closing time adjustment of the solenoid valve.

Pay attention to the influence of environmental temperature on solenoid valves. The power supply current and power consumption should be selected according to the output capacity. The power supply voltage is generally allowed to be around ± 10%. It is necessary to pay attention to the high VA value during AC starting.