The specific classification of pneumatic butterfly valves, the classification and use of butterfly v

Pneumatic Flanged Butterfly Valve, Pneumatic Flanged Butterfly ValveThis product is composed of rubber sealed butterfly valve and carbon steel or stainless steel valve plate and valve stem. It is suitable for temperature 80 120 such as food, chemical industry, petroleum, electric power, textile, papermaking and other water supply and drainage, gas pipelines to regulate the flow and intercept the medium.

Pneumatic regulating butterfly valve is a kind of valve (valve plate) rotating around a fixed shaft perpendicular to the channel, which is composed of a piston double-acting or single-acting (spring-return) pneumatic actuator and a butterfly valve, which is a rotating high-performance regulating or shut-off valve, with electricity, air valve positioner or solenoid valve, air filtration pressure reducer, limit switch (valve position feedback device), which can realize the proportional adjustment and two-position cut-off control of the fluid medium in the process pipeline, so as to achieve the flow, pressure, temperature, Automatic control of parameters such as liquid level.

Pneumatic clamp-type butterfly valve, novel structure, short-distance clamp-type structure formed by the valve body structure to meet the narrow pipeline space, zero external leakage, internal leakage in line with national standards.

Pneumatic rubber-lined butterfly valve, the connection method has flange, clamp, and the seal is lined with nitrile rubber, ethylene propylene rubber, heat-resistant ethylene propylene rubber, natural rubber, neoprene, fluorine rubber, PTFE, according to the chemical properties of the medium has a more reasonable choice.

Pneumatic fluorine-lined butterfly valve, anti-corrosion fluorine-lined butterfly valve adopts a two-piece valve body combination, the valve seat and the valve body lining are integrated, when the valve is working, only the all-plastic valve seat and the plastic-lined butterfly plate are in contact with the medium, and the product can withstand any medium corrosion except for molten alkali metal and elemental fluorine, in which the D71F46 valve stem and the butterfly plate (forging) are integrated, and the surface is evenly coated with a layer of FEP. The inner surface of the valve body channel is smooth, the fluid resistance is small, the CV value is high, the flow capacity is strong, the torque is moderate, the four-stage sealing structure is adopted, and the sealing surface is equipped with the elastic gasket seat of temperature-resistant and anti-aging SI rubber, which completely achieves zero leakage of the medium.

Pneumatic ventilated butterfly valve, featured, with a thin slit between the valve plate seats, the product is suitable for use in environments with poor air circulation.

The main characteristics of pneumatic telescopic butterfly valve are as follows: novel design, reasonable design, unique structure, light weight, convenient operation, fast opening and closing; In addition to the function of adjusting and intercepting the flow and compensating for the thermal expansion and contraction caused by the temperature difference of the pipeline, the telescopic butterfly valve can also provide convenience for the installation, replacement and maintenance of the valve. The sealing part can be adjusted and replaced, and the sealing performance is reliable.

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.

A butterfly valve is a kind of valve that uses a round disc plate as an opening and closing part and rotates with the valve stem to open, close and adjust the fluid passage. The disc plate of the butterfly valve is installed in the diameter direction of the pipe. Earlier applications started with air volume regulation baffles on flues or chimneys, but also in low-pressure systems such as ventilation or air supply.

In recent years, the metal seal butterfly valve has developed rapidly, with the application of high temperature resistance, low temperature resistance, strong corrosion resistance, strong erosion resistance, and high-strength alloy materials in butterfly valves, the metal seal butterfly valve has been widely used in high temperature, low temperature, strong erosion and other working conditions, and partially replaced the globe valve, gate valve and ball valve.

There are many types of butterfly valves, which can be divided into the following four types according to the structural form (the position of the stem rotation centerline is different).

1. Central butterfly valve: the shaft of the valve stem, the center of the disc plate and the center of the valve body and the center of the valve body are in the same position;

2. Single eccentric butterfly valve: the shaft of the valve stem deviates from the center of the disc plate;

3. Double eccentric butterfly valve: the shaft of the valve stem deviates from the center of the disc plate and the center of the valve body;

4. Triple eccentric butterfly valve: on the basis of double eccentricity, the center line of the conical sealing surface and the center line of the valve body are deflected at an angle.

There are many ways to classify butterfly valves, and they are divided into soft seal butterfly valves and hard seal butterfly valves according to their sealing materials.

Soft Seal Butterfly Valve: The sealing pair is composed of non-metallic soft materials to non-metallic soft materials, or metal hard materials to non-metallic soft materials.

Hard Seal Butterfly Valve: The sealing pair is composed of a metal hard material against a metal hard material.

Difference Between Soft Seal Butterfly Valve and Hard Seal Butterfly Valve:

1. Soft seal butterfly valves are mostly centerline type hard seals, and most of them are single eccentric, double eccentric, and triple eccentric butterfly valve structures.

2. Soft seal is used in room temperature environment. Hard seals can be used in low temperature, normal temperature, high temperature and other environments.

3. The soft seal is used for low pressure-normal pressure, and the hard seal can also be used for medium and high pressure 4. The sealing performance of the soft seal and the triple eccentric hard seal butterfly valve is relatively good, and the triple eccentric butterfly valve can maintain a good seal in the high pressure and high temperature environment.

Because of their different characteristics, soft seal butterfly valves are suitable for two-way opening and closing and adjustment of ventilation and dust removal pipelines, water treatment, light industry, petroleum, chemical and other industries. Hard seal butterfly valves are mostly used in heating, gas supply, gas, oil, acid and alkali environments.

Abstract:The pneumatic butterfly valve is composed of a pneumatic actuator and a butterfly valve, and the working principle is to use compressed air to push multiple groups of combined pneumatic pistons in the actuator to move, so as to play the role of a valve. When adjusting, compared with the manual butterfly valve will be more complicated, if the pneumatic butterfly valve is adjusted, it needs to be combined with the analog signal of the electric control cabinet, set to the corresponding angle below to complete the adjustment, and then with me to understand what is the working principle and structure of the pneumatic butterfly valve and what are the adjustment methods of the pneumatic butterfly valve.

1. What is the working principle and structure of pneumatic butterfly valve?

1. The working principle of pneumatic butterfly valve.

Use compressed air to push multiple groups of combined pneumatic pistons in the actuator to move, transmit force to the characteristics of the beam and the inner curve track, drive the hollow core spindle to rotate, and the compressed air disc is transmitted to each cylinder, change the inlet and outlet position to change the direction of rotation of the spindle, and adjust the number of cylinder combinations according to the requirements of the rotation torque required by the load (valve) to drive the load (valve) to work.

2. The structure of the pneumatic butterfly valve.

The pneumatic butterfly valve is composed of a pneumatic actuator and a butterfly valve, which is a conventional butterfly valve preferred for pipelines, with a simple structure, a small flow resistance coefficient, and a straight flow characteristic. It has the advantages of light weight, easy installation and small driving torque. Due to the advantages of pneumatic butterfly valve structure, it can be used not only for cutting off the medium, but also for adjusting the flow rate of the medium.

The sealing ring of the valve body is divided into nitrile rubber and PTFE rubber, and the leakage can reach zero. The selection of parts of different materials and the use of sealing rings of different materials can adapt to different media and working conditions, so that the cost and performance can achieve optimal results.

Because of the structural characteristics of the pneumatic butterfly valve, it is suitable for temperature 120 or 150, nominal pressure Water supply and drainage, sewage and blind water, food, heating, gas, shipbuilding, hydropower, metallurgy, energy system and textile industries, especially suitable for high leakage requirements, corrosive occasions, as a flow adjustment and interception medium.

2. What are the adjustment methods of pneumatic butterfly valves?

1. The adjustment of the pneumatic butterfly valve should be carried out according to its performance

1. If it is a switch-type ascending pneumatic butterfly valve, it is only necessary to debug the valve plate of the butterfly valve to the correct position before the installation of the pneumatic actuator, and wait for the installation of the pneumatic actuator, limit switch and solenoid valve to test the switch effect with air source.

2. If the pneumatic butterfly valve is an adjustable type, it needs to be combined with the analog signal of the electric control cabinet and set to the corresponding angle.

3. If the pneumatic butterfly valve is intelligent, it is necessary to add the PLC part, combine the signal of the electric control cabinet for programming, and visualize the results.