How to select the type of control valve, how to choose the type of control valve type, and how to ch

How to select the control valve mainly refers to the following elements.

1. According to the process conditions, select the appropriate structural form and material. For example, the body material of the control valve is selected according to the characteristics of the medium, and the sealing material is selected according to the temperature.

2. According to the characteristics of the process object, select the flow characteristics of the Vton control valve. For example, there are linear, 100% and so on.

3. According to the process operation parameters, select the appropriate Vton control valve caliber size. For example, choose the right caliber according to the flow rate.

4. According to the requirements of the process, select the required auxiliary devices.

5. Reasonable selection of executive agencies. The response speed of the actuator should be sufficient for the process.

6. Choose self-powered, electric, pneumatic according to the energy source.

Requirements for control stroke time: The actuator of the selected Vton control valve should be able to meet the requirements of the valve stroke and the leakage level of the process. In some cases, such as the selection of pressure regulating valves (including vent valves), the actual possible pressure difference should be considered for appropriate amplification, that is, the actuator is required to provide a large force.

Otherwise, when there is an abnormal situation in the process, the actual pressure difference between the front and back of the regulating valve is large, and there will be a danger that it cannot be closed or opened.

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.

If you ask about process valves, those are generally according to the caliber, and the requirements for adjustment accuracy are not high, and there are many enterprises in Fuyang, Zhejiang, and it is also more suitable.

If you need an industrial valve, then the selection of the control valve needs to use these parameters: valve front, valve pressure, medium, temperature, pipe diameter, dynamic viscosity, density, and then the general control valve companies have their own selection software, and these parameters can be entered into the selection.

Are you talking about industrial or building use, the selection method is different, first determine the medium, water or vapor or chemicals? The second is the adjustment or switching, as well as the material of the valve, cast copper, cast iron, cast steel? If it is an electric valve, the actuator is also selected, and the actuator must determine the signal.

Models are selected based on the manufacturer's product range.

So what is a control valve? The control valve, also known as the control valve, is the final control element in the field of industrial automation process control that changes the process parameters such as medium flow, pressure, temperature, and liquid level by accepting the control signal output by the regulation control unit and using power operation. It is generally composed of an actuator and a valve.

There are many types of control valves, how do we choose?

1. How to choose the model of the distribution control valve.

When choosing a control valve model, the first thing to consider is the functional aspect. According to the temperature, corrosion and other properties of the pipeline conveying medium, the temperature resistance, corrosion resistance (corrosion resistance, cavitation, erosion), anti-blocking, differential pressure p (including the normal working pressure difference, the differential pressure when the valve is closed), and the leakage should meet the process requirements. This aspect is mainly reflected in the body of the regulating valve.

In terms of regulating valve parameters, the selection of regulating valve parameters mainly includes the selection of action mode, adjustment speed, adjustable ratio verification, flow characteristics selection, valve caliber selection, and accompanying opening verification and other parameters. This item is mainly the selection of the technical parameters of the control valve actuator.

2. What are the models of control valves?

1) Pneumatic control valve.

Classified according to the form of pneumatic actuator.

a) Thin film actuators. It is also divided into straight-mounted type (positive action and reaction) and side-mounted type (positive action and action).

b) Piston actuator, which is divided into proportional type (positive and negative and two-position.

c) Long stroke actuator.

d) Rolling film actuators.

Classification according to the form of regulation: (a) modulation; (b) severance; (c) Adjustment cut-off type.

Classification by moving type: (a) linear stroke; (b) Angular travel.

Classified according to the shape of the spool: (a) flat spool; (b) Plunger-shaped spool; (c) window-shaped spool; (d) sleeve-shaped spool; (e) Multi-stage spool; (f) Deflector spool; (g) Butterfly spool; (h) Ball spool.

Classification according to flow characteristics: (a) straight line; (b) equal percentages; (c) parabola; (d) Quick open.

According to the form of the upper bonnet, the classification is quiet: (a) ordinary type; (b) Dispersion (heat absorption) type; (c) long-necked; (d) Bellows sealed type.

2) Electric control valve.

Classified according to the form of electric title mechanism: (a) angular stroke; (b) straight stroke; (c) Multi-turn type.

Classified by attachment form: (a) servo amplifier; (b) Limit switches.

Classification according to flow characteristics: (a) straight line; (b) equal percentages; (c) parabola; (d) Quick open.

Classified according to the form of the upper cover: (a) ordinary type; (b) Dispersion (heat absorption) type; (c) long-necked; (d) Bellows sealed type.

Due to the wide variety of electric control valve products, and various models and product performance are not the same, users should choose according to their actual needs. Today, we will introduce the key points of the selection of electric control valves, hoping to help users better apply this product.

The main control parameters of the electric control valve are: nominal diameter, design nominal pressure, allowable temperature range of medium, flow coefficient, etc.

For strict occasions that require a proportional relationship between the flow rate and the opening height, a special control valve should be selected. Ball valves and butterfly valves can be selected when they are generally coarsely adjusted.

The sealing performance of the valve is one of the main indicators to evaluate the quality of the valve. The sealing performance of the valve mainly includes two aspects, namely internal leakage and external leakage. Internal leakage refers to the degree of sealing of the medium between the seat and the shut-off.

Leakage refers to leakage in the stem packing area, leakage in the mid-port gasket area, and leakage in the valve body due to casting defects. Leakage is not allowed.

There are four kinds of ideal flow characteristics of the control valve: quick-open, parabolic, linear, and equal percentage, and it is necessary to select the control valve with suitable flow characteristics according to the actual working flow characteristics.

The selection of the nominal diameter of the control valve should be determined according to the required valve flow capacity. The nominal diameter of the control valve should not be too large or too small. Excessive size, increased engineering costs, and the valve is in the low percentage range, the adjustment accuracy is reduced, and the control performance is worse.

If it is too small, it will increase the resistance of the system, and even when the valve is 100% open, the system will still not be able to meet the set capacity requirements.

6. The adjustment pressure difference and shut-off pressure difference of the control valveFor the control valve, the allowable adjustment pressure difference and the shut-off pressure difference are important indicators for its selection. If the actual pressure difference is higher than the allowable adjustment pressure difference of the control valve, the valve will not be able to adjust accurately, and the valve actuator will be seriously damaged.

What are the important factors in the selection of control valves?

This article introduces in detail the important elements of the selection of control valves; Part of the valve knowledge materials are excerpted from the American Vedun vton valve literature, by the original, if you think it will be helpful to you, please raise your noble hand, give the American Vedun vton valve a like.

In the field of industrial automation process control, the control valve is the final control element that changes the process parameters such as medium flow, pressure, temperature, and liquid level by accepting the control signal output by the regulation control unit, with the help of dynamic operation. It is generally composed of an actuator and a valve.

According to the driving mode, the common classification of control valves: imported pneumatic control valves, imported electric control valves, imported self-operated control valves, hydraulic control valves.

An important element in the selection of control valves.

1. Select the pressure level of the valve according to the actual working condition pressure, the pressure before and after the valve.

2. Select the material of the control valve according to the characteristics of the medium.

3. Select the caliber of the electric control valve according to the flow rate.

Fourth, if it is an electric control valve, the voltage should be selected, and if it is a pneumatic control valve, the positioner should be selected.

5. Select the explosion-proof or non-explosion-proof or explosion-proof level of the electric actuator or positioner, or the protection level.

Flow, if it is a self-operated control valve, make sure that you want to adjust the temperature, pressure, flow rate or differential pressure by yourself, and then make a choice.

Selection principle of control valve:

1. According to the process conditions, select the appropriate structural form and material.

2. According to the characteristics of the process object, select the flow characteristics of the control valve.

3. According to the process operation parameters, select the appropriate caliber size of the regulating valve.

4. According to the requirements of the process, select the required auxiliary devices.

5. Reasonable selection of executive agencies. The response speed of the actuator should be sufficient for the process.

Requirements for control stroke time: The selected control valve actuator should be able to meet the requirements of valve stroke and process leakage level. In some cases, such as the selection of pressure regulating valves (including the venting Xiaohuai valve), the possible pressure difference of the actual Qiao companion should be considered for appropriate amplification, that is, the actuator is required to provide a large force.

Otherwise, when there is an abnormal situation in the process, the actual pressure difference between the front and rear of the regulating valve is large, and there will be a danger that it cannot be closed or opened.

A regulating valve is a device or device used to control the flow of fluids, such as liquids or gases. It is designed to regulate the flow, pressure, or temperature of a fluid to meet the needs of the system for ultra-clear starting. A control valve usually consists of a valve body, a spool, and an operating mechanism.

V-type regulating ball valve.

Control valves control the flow of fluid by changing the position or opening of the spool. When the spool is opened, fluid can freely enter or leave the pipe or vessel through the valve body. When the spool is closed or partially closed, the flow of fluid will be restricted.

Control valves adjust the flow of fluid by changing the position of the spool or the pressure or temperature by changing the opening of the spool.

V-type regulating ball valve.

The type and design of control valves varies depending on the needs of the application. Common types of control valves include ball valves, butterfly valves, gate valves, and throttle valves. Selecting the appropriate valve type and parameters depends on the specific application needs, such as fluid characteristics and operating conditions.

In summary, control valves are devices used to control the flow of fluids and achieve flow, pressure, or temperature regulation, and they play a key role in a variety of industrial and commercial applications.

The control valve, also known as the control valve, is the final control element that changes the process parameters such as medium flow, pressure, temperature, and liquid level by accepting the control signal output by the regulation control unit and using dynamic operation in the field of careful training control of industrial automation process. It is generally composed of an actuator and a valve. According to the characteristics of the stroke, it can be divided into straight stroke and angular stroke; According to the power used by the actuator it is equipped with.

The control valve, also known as the control valve, is the final control element that changes the process parameters such as medium flow, pressure, temperature, and liquid level by accepting the control signal output by the control control unit by accepting the control signal output of the control control unit. It is generally composed of an actuator and a valve. According to the stroke characteristics, the control valve can be divided into linear stroke and angular stroke; According to the power used by the actuator, it can be divided into three types: pneumatic control valve, thin electric control valve, and hydraulic control valve; According to its functions and characteristics, it can be divided into three types: linear characteristics, equal percentage characteristics and parabolic characteristics.

The control valve is suitable for air, water, steam, various corrosive media, mud, oil and other media. English name: Control Valve, the tag usually starts with FV.

Commonly used classification of control valves: pneumatic control valves, electric control valves, hydraulic control valves, self-operated control valves.

First of all, it is necessary to select the type of valve according to the working conditions, calculate the flow rate, determine the diameter and opening.

According to the stroke characteristics, the control valve can be divided into: linear stroke and angular stroke. The linear stroke includes: single-seat valves, double-seat valves, and sleeve control valves.

Barrel valves, angle valves, three-way valves, diaphragm valves; Quarter-turn includes: butterfly valves, ball valves, eccentric rotary valves, and full-function ultra-light control valves. According to the driving mode, the control valve can be divided into:

Pneumatic control valves, electric control valves and hydraulic control valves, that is, pneumatic control valves with compressed air as the power source, electric control valves with electricity as the power source, and electro-hydraulic control valves with the pressure of liquid medium (such as oil, etc.) as the power source; According to the form of adjustment, it can be divided into: adjustment type, cutting type, adjustment cutting type; According to the flow characteristics, it can be divided into: linear, equal percentage, parabolic, and fast open.