What are the characteristics of the automatic control valve, what are the characteristics of the con

1.The valve body is designed according to the principle of fluid mechanics and the equal-section low-flow resistance flow channel, and the rated flow coefficient is increased by 30 2The adjustable range is large, the inherent adjustable ratio is 50, and the flow characteristics are straight and equal percentages.

3.The electric double-seat control valve has small unbalanced force, good valve stability and large pressure difference.

4.The adjustable cut-off type adopts a soft-seal structure spool, which meets the leakage standard (zero leakage).

5.The servo amplifier uses deep dynamic negative feedback to improve the accuracy of automatic adjustment.

6.Electric operators are available in a variety of forms and can be used for 4 or 0 .

7.The electronic electric control valve can control the valve opening directly from the current signal, eliminating the need for a servo amplifier.

8.The bellows-sealed control valve forms a complete seal against the moving valve stem and blocks fluid leakage.

Here are some of the well-known brands recognized in the valve industry, which are widely recognized and have a high reputation. While rankings may vary depending on time and market conditions, the following brands are generally considered to be among the top brands in the valve industry:

The following are the top ten domestic first-line valve brand manufacturers in 2022-2023, but for reference only: Suzhou Neway Valve Co., Ltd., Shanghai Guanlong Valve Machinery, Shanghai Qizhong Valve Manufacturing, Sanhua, Su Yan, Shentong, Su Valve, Nanfang, Jiang.

First, the word Yao. The above manufacturers are only estimates and references, and the specific situation may vary or fluctuate at any time due to changes in a series of factors such as changes in the market, the size of the competition pattern, and the stability of product quality. As an indispensable key device in industrial production and civil facilities, the quality and reputation of the valve brand directly affect the satisfaction and trust of users.

These brands are known in the valve industry for their innovative technology, high-quality products and reliability. It is important to note that the market and industry are evolving rapidly, and different rankings may vary depending on time and region. For the most up-to-date ranking information, it is recommended to refer to industry reports, professional organizations or market research data for more detailed and accurate information.

Controlvalve is used to regulate the flow, pressure and level of the medium. According to the signal of the adjustment part, the opening of the valve is automatically controlled, so as to achieve the adjustment of medium flow, pressure and liquid level. The control valve is divided into electric control valve, pneumatic control valve and hydraulic control valve.

The control valve is composed of two parts: electric actuator or pneumatic actuator and control valve. The latter has the characteristics of large flow capacity, small unbalance and stable operation bridge, so it is usually especially suitable for occasions with large flow, high pressure drop and less leakage. Flow capacity CV is one of the main parameters for selecting a control valve, and the flow capacity of a control valve is defined as:

When the regulating valve is fully open, the pressure difference between the two ends of the valve is 1g cm3, and the flow rate of the regulating valve per hour is called the flow capacity, also known as the flow coefficient, which is expressed in CV and the unit is T H, and the CV value of the liquid is calculated according to the following formula. According to the flow capacity CV value of the table, the nominal diameter DN of the control valve can be determined. The flow characteristics of the regulating valve are the relationship between the relative flow rate of the medium flowing through the regulating valve and its opening under the condition that the pressure difference between the two ends of the valve remains constant.

There are three types of flow characteristics of control valves: linear, equal percentage and parabolic. The significance of the three note characteristics is as follows: Burn (1) Equal percentage characteristic (logarithm) The relative stroke and the relative flow of the equal percentage characteristic are not in a straight line, and the change in flow rate caused by the change in unit stroke at each point of the stroke is proportional to the flow rate at that point, and the percentage change in flow rate is equal.

Therefore, its advantage is that the flow rate is small, and when the flow rate is large, the flow rate changes greatly, that is, it has the same adjustment accuracy in different openings. (2) Linear characteristics (linear) The relative stroke and relative flow of linear characteristics are in a linear relationship. The change in flow rate caused by the change in the unit stroke is constant.

When the flow rate is large, the relative value of the flow rate changes slightly, and when the flow rate is small, the relative value of the flow rate changes greatly. (3) Parabolic characteristics The flow rate varies proportionally to the two sides of the stroke, and generally has the intermediate characteristics of linear and equal percentage characteristics. From the analysis of the above three characteristics, it can be seen that in terms of its regulation performance, the equal percentage characteristics are the best, and its regulation is stable and the regulation performance is good.

The parabolic characteristics are better than the adjustment performance of the linear characteristics, and any of the flow characteristics can be selected according to the requirements of different use occasions.

<> self-operated control valve is divided into three series: self-operated pressure, differential pressure and flow control valve. The self-operated pressure regulating valve is divided into two types according to the position of the pressure point, the front of the valve and the back of the valve, and when the pressure point is in front of the valve, it is used to regulate the constant pressure in front of the valve; When the pressure point is behind the valve, it is used to adjust the pressure behind the valve to be constant. When the pressure before and after the valve is introduced into both sides of the air chamber of the actuator at the same time, the self-operated differential pressure regulating valve can adjust the constant pressure at both ends of the regulating valve, and the pressure difference installed at both ends of the orifice plate installed on the pipeline can also be introduced into the two sides of the air chamber of the membrane actuator with the ballast to form a self-operated flow regulating valve, or the flow rate can be adjusted by using the self-operated differential pressure regulating valve after the flow is detected in other ways.

Relying on the pressure and temperature of the medium flowing through the valve itself as the energy source to drive the valve to work automatically, there is no need for external power supply and secondary instruments. This kind of self-operated control valve uses the feedback signal (pressure, differential pressure, temperature) at the output end of the valve to be transmitted to the actuator through the signal tube to drive the valve disc to change the opening of the valve, so as to achieve the purpose of adjusting the pressure, flow rate and temperature. Garment wholesale control valves are divided into two types: direct-acting and indirect-acting.

The direct-acting type, also known as the spring-loaded type, has elastic elements in its structure, such as springs, bellows, bellows-type temperature packs, etc., using the principle of elastic force and feedback signal balance. Indirect-acting control valve, with the addition of a commander (pilot valve), which plays the role of amplifying the feedback signal, and then drives the movement of the main valve disc through the actuator to achieve the purpose of changing the valve opening.

Classification: ZZY direct-acting self-operated pressure regulating valve ZZV direct-acting micro-peib pressure regulating valve ZZC direct-acting self-operated differential pressure regulating valve ZZYPII pilot operated self-operated pressure regulating valve ZZW self-operated temperature regulating valve ZZD nitrogen sealing regulating device ZZFX explosion-proof flame retardant breathing valve.

The structure and characteristics of control valves can vary depending on the type and manufacturer, and the following are the common structures and characteristics of general control valves:

V-type regulating ball valve.

1.Structure:

Valve body: The main part of the control valve, usually a pipe-connected housing, containing the inlet and outlet ports.

Valve spool (or disc): Regulates the moving parts within the valve that regulate the flow of fluid by changing its position or opening.

Seat: A fixed part located in the valve body that is in contact with the spool to form a seal and ensure that the fluid does not leak.

Operating mechanism: A device used to control the position or opening of the valve core, which can be a manually operated handle, gear, electric motor or pneumatic device, etc.

2.Features:

Regulating performance: The regulating valve has good regulating performance, which can accurately control the flow, pressure and temperature of the fluid as needed.

Accuracy: Some control valves have high-precision regulation that allows for flow or pressure regulation to a very small range.

Stability: The control valve can maintain stable working performance under different working conditions, and has a certain anti-interference ability to external disturbances. Tsuneno.

Reliability: The control valve is made of durable materials and design, which has high reliability and long life, and is able to maintain stable performance in long-term operation.

Automatic control: Many control valves can be integrated with the automation system to achieve remote control and automatic adjustment, improving the automation of the system.

Multi-functional: Control valves often have a variety of functions, such as flow metering, pressure compensation, temperature regulation, etc., which can be adapted to different application needs.

Safety Protection: Some control valves have overload protection or emergency shut-off capabilities that automatically take protective action when fluid pressure or temperature exceeds a safe range.

It is important to note that the structure and characteristics of specific control valves will vary depending on the type and manufacturer. When selecting the right control valve for a specific application, its structural characteristics and performance parameters need to be considered to meet the needs of the system and ensure good working results.

The structure and characteristics of the control valve are as follows:

The regulating valve is specially used to adjust the flow of the medium, the pressure and the position of the liquid, according to the signal of the regulating part, the valve will automatically control the opening size, so as to achieve the flow of the regulating medium, the pressure and the liquid level, the regulating valve mainly has three kinds of electric control valve, pneumatic control valve and hydraulic control valve; The control valve is usually composed of two parts: electric actuator or pneumatic actuator and valve body, and the straight stroke mainly has two kinds of straight through single-seat type and straight-through double-seat type, the latter has a large flow capacity, small unbalanced force and stable operation, so it is usually especially suitable for large flow, high pressure drop and large leakage occasions, and the angle stroke mainly has V-type electric control ball valve, electric butterfly valve, ventilation control valve, eccentric butterfly valve.

<> nearly 100 years from the beginning of the 20th century to the present, the control valve is still at the level of the first generation of products. Its characteristics are: single-seat valves, double-seat valves, and sleeve valves at the level of the sixties and seventies of the 20th century as the leading products; This generation of products is not complete in function, and has to rely on expanding product varieties and variants to adapt to various occasions, resulting in a wide variety of specifications, and particularly high requirements for the use, calculation, selection, adjustment, maintenance, and spare parts of control valves; Poor reliability, many problems when using; It's bulky.

Nowadays, the more popular CV3000 and fine small valves are 30% more than the traditional old products: the weight is reduced by 30%; 30% drop in height; 30% increase in flow coefficient. But they did not bring a qualitative breakthrough, but only improved the traditional products.

The second-generation product should have a qualitative breakthrough in terms of reliability, function and weight. Its characteristics are: the full-power Zhensuineng ultra-light control valve replaces many products with poor reliability, incomplete functions and very bulky products, and replaces the leading products of the first generation of single-seat valves, double-seat valves and sleeve valves, and becomes the leading products of the second generation; The electronic electric full-function ultra-light travel control valve gradually replaces the traditional combination of "pneumatic valve + electrical valve positioner + air source" that has to be adopted due to the poor reliability of the original actuator.

From the perspective of external peibu, the second generation of products should have the characteristics of lightweight, miniaturization and instrumentation.

Its outstanding features are intelligent, and meet the requirements of the fieldbus, and the characteristics of the application are: interface with the computer; Self-diagnosis improves reliability and further reduces the failure rate. Modify the characteristic curve of the valve, thereby changing the regulating quality of the valve; The varieties of rotary lobe pump control valves and the requirements for the use of control valves are further simplified; In terms of indicators, it meets the requirements of modern industry to reach a new level of performance, such as some demanding requirements for control valves in new processes and systems introduced by some industrial sectors.

The larger feature of the self-operated pressure group Kaichang control valve is that it can work in the field without gas and electric energy, and the preset pressure can be adjusted arbitrarily during operation. Sensitive action, good sealing performance, in the automatic control system of various equipment vapor, liquid, and vapor medium to relieve pressure, pressure stabilizer pipe (used for post-valve pressure adjustment) or pressure relief, pressure stabilizer pipe (for pre-valve pressure adjustment) automatic control valve. According to the different working conditions of users, different types of valve core structure shapes and different actuators can be selected to achieve the effect.

The electrical control valve has the characteristics of compact structure, light weight, sensitive action, small pressure drop damage, easy to carry, accurate flow characteristics and convenient maintenance. In general, it has the advantages of early masking, such as stable operation, large allowable pressure difference, accurate flow characteristics and low noise. It is especially suitable for working places with small allowable leakage and large pressure difference between valves.

PCV-VG: Pressure control capacity to ensure ventilation mode, which can not only strengthen oxygenation by means of pressure control to avoid airway injury, but also better ensure tidal volume, which solves the problem of uncontrollable pressure in VCV mode and uncontrollable tidal volume in PCV mode.

The control valve is composed of two main components: the valve body assembly and the actuator assembly (or actuator system), which are divided into four series: single-denier seat series control valve, double-seat series control valve, sleeve series control valve and self-operated series control valve.

Variants of the four types of valves can result in a multitude of different configurations that can be applied.

Each structure has its own applications, characteristics, advantages and disadvantages of special bright ants. While some control valves have a wider range of applications than others, not all control valves are suitable for all applications to work together to create the best solution for enhancing performance and reducing costs.

Features:1.There are various different types of control valves, and their application occasions are different, therefore, the type of control valve should be reasonably selected according to the requirements of the process production process.

2.Pneumatic control valves are divided into two types: air opening and air closing. The air-open control valve closes in the event of a fault condition and the air-closed control valve opens in the event of a fault. Some auxiliary equipment can be used to form a position retention valve or make the control valve self-locking, that is, the control valve maintains the valve opening before the failure when the fault occurs.

3.The way of air opening and gas closing can be realized by the combination of positive and negative actuator types and positive and negative body valves, and can also be realized by valve positioners when using valve positioners.

4.All kinds of control valves have different structures and have their own characteristics.