How to select the electric valve of the fan The selection method of the electric control valve of th

1. Operating torque: Operating torque is the most important parameter for selecting valve electric devices. The output torque of the electric device should be multiple of the maximum torque of the valve operation.

2. Operating thrust: There are two main engine structures of the valve electric device, one is not equipped with a thrust plate, and the torque is directly output at this time; The other is equipped with a thrust plate, and the output torque is converted into output thrust through the stem nut in the thrust plate.

3. The number of rotations of the output shaft: the number of rotations of the output shaft of the valve electric device is related to the nominal diameter of the valve, the pitch of the valve stem and the number of threaded heads, which is calculated according to m=h zs (where: m is the total number of rotations that the electric device should meet; h is the opening height of the valve, mm; s is the pitch of the stem transmission thread, mm; z is the number of stem thread heads.

4 Stem diameter: For multi-turn open-rod valves, if the maximum stem diameter allowed by the electric device cannot pass through the stem of the equipped valve, it cannot be assembled into an electric valve. Therefore, the inner diameter of the hollow output shaft of the actuator must be larger than the outer diameter of the stem of the open rod valve.

For the dark rod valve in the partial rotary valve and the multi-turn valve, although the passing problem of the valve stem diameter is not considered, the diameter of the valve stem and the size of the keyway should also be fully considered when selecting, so that it can work normally after assembly.

5. Output speed: The opening and closing speed of the valve is fast, and it is easy to produce water hammer. Therefore, the appropriate opening and closing speed should be selected according to different use conditions.

6. Installation and connection methods: the installation methods of electric devices include vertical installation, horizontal installation and floor installation; The connection mode is: thrust plate; Stem pass (open-rod multi-turn valve); Dark rod multi-rotation; No thrust disc; The stem does not pass; Partial rotary electric device has a wide range of uses, is an indispensable equipment to achieve valve program control, automatic control and remote control, and is mainly used in closed circuit valves.

However, the special requirements of the valve actuator cannot be overlooked, which must be able to limit the torque or axial force. Usually, the valve electric device uses a coupling that limits the torque.

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 influential first-line brands of water system valves and industrial valves can be used as a reference, but for reference only: Suzhou Neway Valve, Shanghai Guanlong Valve, Shanghai Qizhong Valve, 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.

The air volume control valve is divided into two types: manual and electric, manual is to adjust the size of the damper or close the damper by hand, and the electric damper generally uses a solenoid valve to adjust the on/off damper, one is manual and the other is automatic.

The difference between the air volume control valve and the electric damper is that the driving mode is different, and the control state is also different;

1. an electric damper;

The electric damper is electrically driven, and the control mode of the electric damper can be divided into electric switch opening and electric analog, the electric switch is only open and closed, and the electric analog can be adjusted between 0-100%;

2. an air volume regulating valve;

The air volume control valve is the so-called manual damper, and the control state can be adjusted between 0-100%, which needs to be operated manually.

The electric damper can be divided into electric switch opening and electric analog, the electric switch is only open and closed, and the electric analog can be adjusted between 0-100%; The air volume control valve is the so-called manual damper, which can be adjusted from 0-100%, but it needs to be operated manually.

Airflow control valve.

The air volume control valve is an indispensable air conditioning terminal fitting in the ventilation, air conditioning and air purification projects of industrial plants and civil buildings, which is generally used in air conditioning and ventilation system pipes to adjust the air volume of branch pipes, and can also be used for mixed adjustment of fresh air and return air.

First, the characteristics of the air volume control valve.

l) The size of the pipe of the split multi-leaf air volume control valve is the same as that of the rectangular air duct specified in the national ventilation duct standardization.

2) The blades of the air volume control valve are split and smooth open, which are used as control valves in ventilation, air conditioning and air purification systems.

3) Through the test measurement, the air tightness of the air volume control valve is good, its relative air leakage is about 5%, and the adjustment performance is good.

2. Structural characteristics of air volume control valve.

l) The air volume control valve is unified into four specifications in the blade width, the blade shape is diamond-shaped double blade, and the blade adopts soft lap joint, so the sealing performance is good.

3) The valve body structure of the air volume control valve is cold-rolled with 2 mm galvanized sheet, and then welded with carbon dioxide gas protection or processed and welded by ordinary Q235 plate; The blades are cold-rolled with 1 mm galvanized sheet for corrugated shape, two pieces of synthetic spot welded square shaft, or 2 mm G235 steel plate cold pressed forming, and a single piece of punched socket square shaft or welded round shaft.

4) The regulating valve is divided into manual and electric, according to the materials used: iron plate, galvanized sheet, aluminum alloy plate, stainless steel plate, four kinds of valve body structure and specifications.

3. Scope of application of air volume control valve.

It is widely used in the HVAC system of industrial and mining and civil buildings, and it is one of the key equipment to control the ventilation mode in various environments. Its main characteristics are flexible operation, low noise, small leakage, (closed leakage< wide operating temperature area, reliable structure, safe and convenient.

1. Structural principle: electric air volume control.

Suitable for supply or exhaust air.

The air volume range is about 5 1

Differential pressure ranges from 20 to 1000 Pa.

The air volume control accuracy is high, and it is necessary to ensure that the arrangement of the air duct meets the best airflow characteristics.

The air volume is set or programmed before leaving the factory, and each device is tested for airflow performance on the calibration bench. The relevant parameters are identified on the test label affixed to each device.

If necessary, the air volume value can be re-measured or set on site.

Installed horizontally or vertically.

The damper can be completely closed.

The vaf valve plate has good air tightness when closed, and the air leakage volume does not exceed 5

The regulator is a mechanical part and requires no maintenance.

The electric valve is composed of an electric actuator and a valve body, and according to the requirements of use, the valve can be selected butterfly valve, ball valve, gate valve, globe valve, etc. When selecting electric valves, it is necessary to fully consider the characteristics of the process medium and the requirements of the working conditions on site, and select products that meet the requirements of on-site use.

When selecting electric valves, the following parameters are generally required: valve material, valve diameter, medium category, pipeline pressure, connection mode, control mode, medium temperature, etc. When selecting valves, it is necessary to take into account the physical and chemical characteristics of the medium, and choose materials with corresponding strength and toughness to ensure that the electric valve can be used for a long time without rupture or deformation.

The valve diameter and connection method should match the pipeline to ensure that the installation can be completed smoothly and meet the requirements of use. The temperature of the medium determines the choice of sealing material, and there are three sealing parts of the valve, namely the contact between the opening and closing parts and the sealing surface of the valve seat, the contact between the valve stem and the valve body, and the contact surface between the valve body and the valve cover. The leakage of any of them will affect the ability of the valve to cut off the medium, and for the flammable, explosive or radioactive medium, it is not allowed to leak to avoid the occurrence of safety accidents, so it is necessary to ensure the reliable sealing performance of the valve.

The selection of electric actuators should also take into account the requirements of on-site operation, the working voltage of the electric valve should match the on-site operation power supply, and there should be corresponding external equipment to control the input signal or feedback signal of the electric valve; The electric actuator should have enough torque to control the opening and closing of the valve; When the electric actuator is connected with the valve, it is necessary to pay attention to the firmness and aesthetics of the connection and improve the service life of the product.

When selecting electric valves, we should not only consider the practicability and operability of the product, but also consider energy saving when designing and manufacturing valves, so that the products have good production efficiency and social benefits.

The electric damper is used as a gas medium to regulate the flow or cut off device in the dusty cold air or hot air gas pipeline of ventilation and environmental protection projects in hardware, chemical industry, building materials, power station, glass and other industries.