How to choose the BURKERT solenoid valve that suits you? Detailed Analysis and Application Guide

BURKERT solenoid valve has the advantages of small size, low power, high upper limit of fluid pressure, and flexible installation. Although customization is required, it can meet various fluid pressure difference conditions.

As a fluid control device, BURKERT solenoid valve has many significant characteristics. Its compact size makes it easy to install and configure; Meanwhile, it has low power consumption and significant economic benefits. In addition, the upper limit of fluid pressure of solenoid valves is relatively high, which can adapt to various complex fluid pressure difference conditions. Although customization may be required in some cases, its flexible installation method and wide range of applications still make it one of the preferred choices in the field of fluid control.

The BURKERT solenoid valve has a unique design and excellent safety. It uses electromagnetic force to drive the iron core inside the magnetic isolation sleeve, without the need for the valve stem to extend, thus avoiding the leakage problem caused by dynamic sealing and making it easy to block the leakage. Compared to other self-control valves, such as electric valves, torque control is more difficult and may cause internal leakage, even leading to the breakage of the valve stem head. The structural characteristics of solenoid valves make it easy to control internal leakage and even reduce it to zero. Therefore, solenoid valves are particularly suitable for handling corrosive, toxic, or high and low temperature media, ensuring safety and worry free use during use.

The simplicity and economy of BURKERT solenoid valve

The structural design of solenoid valves is quite simple, not only easy to install and maintain, but also affordable. Compared to other types of actuators such as regulating valves, their installation and maintenance work is more convenient. In addition, the self-control system constructed by solenoid valves is particularly simple and cost-effective. The solenoid valve is controlled by switch signals, and the connection with the industrial computer is effortless. In today's era of widespread use of computers and significant price drops, the advantage of solenoid valves has become increasingly prominent.

As a key component in the field of fluid control, the structure and working principle of BURKERT solenoid valve are crucial for selection and application. Next, we will delve into the internal structure and working principle of solenoid valves to provide you with a comprehensive understanding.

Have you been amazed by the simplicity and clarity of the working principle of the BURKERT solenoid valve? When the solenoid valve is not powered, the valve needle relies on the elastic force of the spring to tightly seal the passage of the valve body, ensuring that the solenoid valve is in a closed state. However, once the coil is powered on, it will generate magnetic force, which allows the valve core to overcome the elastic force of the spring, lift up and open the channel inside the valve, thereby causing the solenoid valve to enter the open state.

BURKERT solenoid valves are mainly divided into three categories in principle: direct acting, step-by-step direct acting, and pilot operated. Next, we will provide a brief overview of these three types of solenoid valves from three aspects: introduction, working principle, and characteristics. Firstly, let's take a look at the direct acting solenoid valve.

There are two types of BURKERT solenoid valves: normally closed and normally open. In the normally closed type, when the coil is de energized, the solenoid valve is in a closed state; When the coil is energized, electromagnetic force is generated, causing the moving iron core to overcome the spring force and attract the stationary iron core, thereby directly opening the valve and allowing the medium to flow. Once the coil is powered off, the electromagnetic force disappears immediately, and the moving iron core returns to its original position under the action of the spring force. The valve then closes, and the medium flow is blocked. This solenoid valve has a simple structure and reliable operation, and can work normally even in zero pressure difference or micro vacuum environments. Normally open solenoid valves are the opposite. For example, this type is commonly used for solenoid valves with flow paths smaller than 6.

In a normally closed direct acting solenoid valve, when powered on, the solenoid coil generates electromagnetic force, which overcomes the elastic force of the spring and lifts the open part from the valve seat, thereby allowing the valve to open. Once the power is cut off, the electromagnetic force disappears, and the elastic force of the spring will come into play, pressing the open part back onto the valve seat, and the valve will close accordingly. The working principle of normally open solenoid valves is exactly the opposite.

In addition, this type of direct acting solenoid valve also has the characteristic of stable operation in vacuum, negative pressure or zero pressure environments, but its diameter usually does not exceed 25 millimeters. At the same time, there is also a step-by-step direct acting solenoid valve, whose working principle and characteristics are similar to those mentioned above.

The design of BURKERT solenoid valve is clever, integrating the functions of primary and secondary valve opening. The main valve and pilot valve operate step by step, using electromagnetic force and pressure difference to directly open the main valve port. When the coil is energized, electromagnetic force is generated, causing the moving iron core and the stationary iron core to attract each other, thereby opening the pilot valve port. Due to the design of the pilot valve port above the main valve port and the connection between the moving iron core and the main valve core, the pressure in the upper chamber of the main valve can be released through the pilot valve port. Under the combined action of pressure difference and electromagnetic force, the main valve core will move upward, thereby opening the main valve and allowing the medium to flow. When the coil loses power, the electromagnetic force disappears. At this point, the moving iron core will close the pilot valve hole under the combined action of its own weight and spring force. The medium then enters the upper chamber of the main valve core through the balance hole, causing an increase in pressure in the upper chamber. Under the action of spring reset force and pressure, the main valve can be closed and the medium flow is cut off. This step-by-step direct acting solenoid valve has a compact structure and reliable action, and can operate stably even in zero pressure differential environments. Common models such as ZQDF, ZS, 2W, etc. all embody this design concept.

Principle and characteristics of BURKERT solenoid valve

This BURKERT solenoid valve cleverly combines the working principles of direct action and pilot. Under the condition of no pressure difference (i.e. zero pressure difference or vacuum, high pressure), after being energized, the electromagnetic force will directly drive the pilot small valve and the main valve closing member to lift upwards, thereby opening the valve. When there is a starting pressure difference between the inlet and outlet, the electromagnetic force first acts on the pilot valve when energized, causing the lower chamber pressure of the main valve to rise and the upper chamber pressure to fall, and then using this pressure difference to push the main valve upwards. After power failure, the pilot valve relies on spring force or medium pressure to push the closing member downward, thereby closing the valve. In addition, this type of solenoid valve performs better when installed horizontally.

Working principle and characteristics of BURKERT solenoid valve

This BURKERT solenoid valve cleverly connects the pilot valve to the main spool, forming a smooth passage. In the unpowered state, the main valve port of the normally closed solenoid valve remains closed. Once the coil is energized, the magnetic force generated will attract the moving iron core to align with the stationary iron core, causing the pilot valve port to open and allowing the medium to flow towards the outlet. This leads to a decrease in pressure in the upper chamber of the main valve core, creating a pressure difference with the inlet side, thereby overcoming the resistance of the spring and causing the main valve core to move upward until the main valve port opens, allowing the medium to flow smoothly. When the coil is powered off, the magnetic force disappears, and the moving iron core resets under the action of the spring force, closing the pilot port. At this point, the medium flows in through the balance hole, causing the pressure in the upper chamber of the main valve core to rise and move downwards under the force of the spring, ultimately closing the main valve port. The working principle of normally open solenoid valves is the opposite.

When powered on, the BURKERT solenoid valve applies force to the pilot hole, causing it to open. This causes a rapid decrease in pressure inside the upper chamber, resulting in a high pressure difference around the opening. This pressure difference causes the fluid pressure to push the open part upwards, thereby opening the valve. When the power is cut off, the spring force will cause the pilot hole to reopen, and at the same time, the pressure at the inlet will quickly enter the chamber through the bypass hole, forming a lower and higher pressure difference around the valve closing component. This pressure difference further pushes the open part downwards, thereby closing the valve.

Correctly selecting various control valves is one of the important aspects of pneumatic control system design. Reasonable selection can simplify the circuit, reduce the variety and quantity of valves, ensure the accuracy and reliability of the pneumatic system, reduce the consumption of compressed air, and lower costs.

So how should solenoid valves be selected? What principles should be followed when making a choice?

1. Security

Ordinary BURKERT solenoid valves are not waterproof. If the situation does not allow, waterproof type should be selected. Manufacturers can customize according to customer requirements. The rated pressure of the solenoid valve must be higher than the maximum value in the pipeline, otherwise it will shorten the service life or cause other unexpected situations.

Adopting all stainless steel corrosive liquid, strong corrosive medium, and SLF medium. In explosive environments, appropriate explosion-proof equipment should be selected.

2. Function

Electromagnetic valves are divided into 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.

3. Specifications

The fluid in the pipeline must be consistent with the calibration medium in the selected solenoid valve series model. The temperature of the fluid must be lower than the calibration temperature of the solenoid valve. Each solenoid valve has its designated pipe diameter, and some have more than one diameter size to choose from.

4. Economy

Choose one of the various types of BURKERT solenoid valves.