The pulse valve is a special solenoid valve that plays an important role in the pneumatic control system. The following is a detailed introduction of the pulse valve by HANUMAN to help users better understand this component:
What is a pulse valve?
The pulse valve is a diaphragm valve that is controlled by a solenoid or pneumatic pilot valve and can instantly open and close the high-pressure gas source to generate pulses. The pulse valve is mainly composed of solenoid coil, diaphragm, valve core, valve body and other components. It is one of the key components of equipment such as bag dust collector. Under the conditions of standardized installation, correct use and reasonable maintenance, the life of the pulse valve diaphragm can reach more than 1 million times, and the life of the pulse valve itself can reach 5 years.
Pulse valve structure
The pulse valve is generally composed of the following parts:
- Valve body: The valve body is the outer shell of the pulse valve, which supports and protects the internal components. Usually made of metal, with certain strength and sealing properties, used to withstand gas pressure and prevent gas leakage.
- Diaphragm: The diaphragm is the key control component of the pulse valve. It is generally made of flexible materials such as rubber and has good flexibility and sealing properties. The diaphragm divides the interior of the pulse valve into different air chambers, and controls the opening and closing of the gas channel by deforming under different air pressures, thereby realizing the switching function of the pulse valve.
- Solenoid coil(solenoid driven pulse valve): When current passes through the solenoid coil, a magnetic field is generated, which attracts components such as the valve core or moving column to move. Thereby changing the gas flow state in the valve, which is used to control the opening and closing of the pulse valve. The performance of the solenoid coil directly affects the response speed and working reliability of the pulse valve.
- Valve core: Under the action of solenoid force or air pressure, the valve core can move up and down or left and right, etc., to achieve control of the gas channel. The valve core is usually used in conjunction with a spring. When the solenoid force or air pressure disappears, the valve core returns to its initial position under the action of the spring force, closing the gas channel.
- Air chamber: Generally includes upper air chamber, lower air chamber, etc. Different air chambers are connected through throttle holes, constant pressure pipes, etc. After the gas enters the air chamber, the pressure difference between the air chambers drives the movement of the diaphragm or valve core to realize the pulse jet function of the pulse valve.
- Throttle hole: The function of the throttle hole is to limit the flow rate and flow rate of the gas, so that a stable pressure difference can be formed between the gas chambers, which can ensure the normal operation of the pulse valve. When the pulse valve is opened, the throttle hole can also control the gas ejection speed and flow rate to produce a pulse gas flow that meets the requirements.
- Seals: Seals are used to ensure the sealing between the various components of the pulse valve to prevent gas leakage, thereby ensuring the working efficiency and performance of the pulse valve. Common seals include rubber sealing rings, gaskets, etc.
Working principle of pulse valve
The working principle of the pulse vale is mainly based on solenoid control and air pressure changes. The following is description of the detailed working mechanism of the pulse valve:
When the pulse valve does not receive any stimulation signal, it is usually in the closed state. At this time, the diaphragm(or valve core) closes the valve tightly under the action of spring force or air pressure to prevent gas flow.
1. Activation signal and solenoid control
• Signal reception: When the pulse valve receives an activation signal(such as an electrical signal) from a controller or other trigger source, the solenoid inside the valve will be activated.
• Magnetic field generation: When the solenoid is energized, it generates a magnetic field. This magnetic field attracts the iron core(or armature), causing it to move.
• Valve core movement: The movement of the core will cause the valve core(or directly connected to the diaphragm) to move, thereby changing the open and closed state of the valve.
2. Air pressure changes and diaphragm movement
• Air pressure imbalance: When the valve core moves, it changes the air pressure balance above and below the diaphragm. Usually, there is a gas chamber above the diaphragm to store gas. When the valve core moves to open the passage between the air chamber and the outside, the air pressure in the air chamber will drop rapidly.
• Diaphragm movement: Due to the difference in air pressure above and below the diaphragm, the diaphragm is subjected to an upward force, causing it to move and open the valve. This moving process is usually very fast and can be completed in a few milliseconds.
• Gas release: When the diaphragm opens the valve, high-pressure gas will flow through rapidly, creating a short pulse signal.
3. Reset and shutdown
• Signal disappearance: When the activation signal disappears(such as a power of an solenoid), the magnetic field will disappear and the core(or armature) will return to its initial position under the action of a spring or other reset mechanism.
• Diaphragm reset: As the core is reset, the diaphragm is also subjected to a downward force(which may be spring force or air pressure difference), causing it to return to its original position and close the valve.
• Prepare for next action: At this time, the pulse valve returns to its initial closed state and prepares for the next action.
Functional features of pulse valve
The main function of the pulse valve is to control the on and off of the fluid, especially to generate pulse signals to drive related equipment. In the bag dust collector, the pulse valve generates pulse airflow through rapid switching to realize the cleaning operating of the filter bag and ensure the effective operation and dust collection efficiency of the dust collector.
The pulse valve also has many features, as follows:
- Accurate control: The pulse valve adopts the solenoid control principle, which can achieve accurate control of fluid or gas. By adjusting the frequency, width and other parameters of the pulse signal, the flow and pressure of the fluid can be accurately controlled.
- Fast response: The pulse valve has a very short response time and can complete the on-off operation of the fluid within a few milliseconds. This given pulse valves a significant advantage where fast response is required.
- Energy saving and environmental protection: The pulse valve consumes only a small amount of electrical energy when working, and is only energized at the moment of switching, so the energy consumption is low. At the same time, due to its precise control ability, it can reduce unnecessary fluid loss and achieve energy saving and environmental protection.
- Durable and reliable: The pulse valve is made of high-quality materials and has strong corrosion resistance and vibration resistance. This enables the pulse valve to maintain stable performance and extend its service life even in harsh working environments.
- Strong adaptability: Pulse valve is suitable for a variety of fluid media and working environments, such as gas, liquid, etc. At the same time, its compact structure and small size make it suitable for installation in a small space.
