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Debugging Methods and Precautions for Pneumatic Butterfly Valve Device

Debugging Methods and Precautions for Pneumatic Butterfly Valve Device

Wuxi Xinming automatic control valve industry co., ltd. today introduces the debugging methods and matters needing attention of pneumatic butterfly valve device Pneumatic butterfly valve is composed of butterfly valve and pneumatic actuator. The pneumatic butterfly valve adopts the circular butterfly plate rotating with the valve to realize the opening and closing performance. The pneumatic valve operated by the supply operation is primarily used as a shut-off valve. Conditioning or conditioning with segmented valves. At present, the butterfly valve has a large volume and low pressure. The use of medium diameter pipes is increasing. Pneumatic butterfly valve device debugging methods and precautions: First, the valve is closed by external force. That is, rotate the valve shaft clockwise until the valve plate is in sealing contact with the valve seat. At the same time, keep the cylinder closed (I. e. the small groove on the cylinder shaft is perpendicular to the cylinder block; if the valve is rolled clockwise to close the valve) and connect the cylinder to the valve (parallel to the device direction) or ensure that the screw holes are aligned (perpendicular to the valve body). There is not much error. In case of misalignment, rotate the cylinder slightly before tightening the screws. Pneumatic butterfly valve debugging, first check whether the valve fittings, solenoid valves, silencers and other devices. If incomplete, do not debug. Ensure that there is no debris. Before operation, the device is on the valve plate in the valve body, and the manual button of the solenoid valve is manually operated during the first test run (when the solenoid valve coil is closed during manual operation, manual operation is useful. In the case of electronic control operation and manual setting to 0 bit, electronic control operation is useful, 0 bit to close the valve, 1 bit to open the valve, that is, when the valve is powered on. The valve is closed when the power is off, and the valve is opened when the power is off. You can rotate it 180 degrees to install the solenoid valve coil) and check the operating status of the valve. In the process of debugging operation, it is found that the starting position of the valve is very slow, but it is very fast after the action. In this case, the valve is closed too tightly. What needs to be reduced is the cylinder stroke (replacing the stroke adjustment screws at both ends of the cylinder must be adjusted inward at the same time. When adjusting, you need to move the valve to the open position, close the air source, and then adjust. Conditioning valve opening and closing convenience, can not leak. The muffler is an adjustable muffler, which can adjust the opening/closing speed of the valve. The silencer should be adjusted to the opening of the appropriate valve opening and closing speed. If the conditioning is too small, the valve may not work. The above is the relevant content about the debugging method and matters needing attention of pneumatic butterfly valve device. Assuming that you have demand for our products, please contact online customer service for detailed inquiries, quotations and other information. You are also welcome to come to our company for inquiries and are sincerely invited to cooperate with you!

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2022

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09

What causes pneumatic ball valve damage? How to prevent?

What causes pneumatic ball valve damage? How to prevent?

Wuxi Xinming automatic control valve industry Co., Ltd. today to introduce to you the causes of damage to the pneumatic ball valve? Pneumatic ball valve is widely used in the field of coal chemical equipment gasification. Due to the use of working conditions containing solid particles, ash, sulfur and other special media, it should meet the requirements of wear resistance, corrosion resistance, erosion resistance, anti scaling and scarring, rapid opening and closing, frequent action, etc., together with good sealing, improve the efficiency of the equipment, make it low energy consumption and safe and reliable operation. 1. Cause analysis of leakage of pneumatic ball valve After a period of time, the valve is not switched in place and jammed. The valve is severely washed and the sealing surface is damaged. If it is more severe, the ball and parts in the valve cavity are damaged, resulting in internal leakage of the valve. The gap between the valve stem and the stuffing box is added, resulting in external leakage of the valve. 1.1 pneumatic ball valve leakage: According to the induction and analysis of various gasification technology, medium and process, the ball valve in key parts is affected by the solid content in the medium, and the valve switching frequency is high together, which is affected by the saving structure of the valve design flow channel, and the pressure difference before and after the valve also increases, resulting in particularly severe flushing and wear of the valve. 1.2 pneumatic ball valve leakage: The unreasonable design of the valve stem packing structure, the over-coaxiality of the ball and valve stem of the valve, the unreasonable selection of valve stem data and other factors cause the valve stem and packing to wear and add during the switching process of the valve stem, and the matching surface of the valve stem and packing is severely worn, resulting in the reduction of the diameter of the valve stem. After all, the medium in the valve flow channel leaks along the axial direction of the valve stem. 2. Improvement measures of pneumatic ball valve Modification of 2.1 and inner seal structure The hard sealing ball valve seat adopts scraping structure design, which makes the ball and valve seat have self-cleaning function in the opening and closing process, which is useful to avoid the deposition and adhesion of particles between the ball and the valve seat, and ensures the smooth connection of the valve action without blocking. Special structural design is selected between the auxiliary valve seat and the valve body and the main and auxiliary valve seats, and metal rings are added between the sealing packing, improving the rigidity and toughness of the packing is further useful to prevent impurities from entering the spring cavity behind the valve seat and ensure the long-term useful work of the spring. Structural Modification of 2.2 Outer Seal The upper and lower end faces of the valve stem are positioned with bearings. The valve stem plays a relative rotation and plays a guiding role to ensure the coaxiality requirements of the valve stem and the ball. The upper part of the packing is a disc-shaped tension spring to ensure the sealing performance of the packing. The pre-tightening force is designed as a live load mode, and the sealing effect is better, which can ensure the service life of the sealing data. 2.3 selection of new technology, new information: According to different working conditions, the valve ball can be selected ceramic metal composite sphere or surface spraying tungsten carbide, zirconium carbide and other information. Through the above improvement of the internal and external sealing structure, the valve sealing surface abrasion resistance and packing sealing function are improved, and the service life of the equipment is extended. The sealing structure of the pneumatic ball valve is relatively reasonable and meets the requirements of the working conditions. The above is about the causes of pneumatic ball valve damage and preventive measures related content, assuming that you have demand for our company's products, welcome to contact online customer service for detailed inquiries, quotations and other information, also welcome to our company inquiries, invited to cooperate with you!

29

2022

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09

Advantages and disadvantages of electric valves and pneumatic valves

Advantages and disadvantages of electric valves and pneumatic valves

Wuxi Xinming automatic control valve industry co., ltd. today compares the advantages and disadvantages of electric valves and pneumatic valves for you. Pneumatic valve actuators are mainly used in nuclear power plants or power plants, because high-pressure water systems require a stable, smooth and slow process. The strength of the electric actuator is a high degree of stability and the user can apply a fairly stable thrust, can reach such a large thrust as long as the hydraulic actuator, but the hydraulic actuator cost is much higher than the electric. The anti-deviation ability of the electric actuator is very good, and the output thrust or torque is basically stable, which can well overcome the unbalanced force of the medium and reach the precise control of the process parameters, so the control accuracy is higher than that of the pneumatic actuator. If the servo amplifier is equipped, it can easily realize the exchange of positive and negative effects, and it can also easily set the off signal valve position state (adhere to/fully open/fully closed). However, when there is a problem, it must stay in the original position, which is not possible for the pneumatic actuator. The pneumatic actuator must rely on a set of combined maintenance system to realize the position retention. The shortcomings of the electric actuator are: The structure is messy and simpler to cause problems, and because of its clutter, the technical requirements for on-site maintenance personnel are relatively higher. The operation of the motor needs to generate heat. If the motor is adjusted too frequently, it will simply cause the motor to overheat and generate thermal maintenance, which will also increase the wear of the reduction gear. There is also the slow operation, which takes a long time to output a signal from the regulator, to the control valve echoes and moves to the corresponding position, which is where it is not as good as pneumatic and hydraulic actuators. Valve pneumatic actuator actuator and regulator is the same as the whole, the actuator has two types of diaphragm and piston. Because of the long stroke, the piston type is suitable for occasions requiring large thrust; while the diaphragm type has a small stroke and can only directly drive the valve stem. Because the pneumatic actuator has the advantages of simple structure, stable and reliable action, large output thrust, and safety and explosion-proof, it is widely used in the production process with high safety requirements such as chemical industry, power plant, oil refining, etc. The primary advantages of pneumatic actuators are: they can accept continuous gas signals, output straight lines to generate displacements, and some can output angular displacements when equipped with rocker arms. It has positive and negative effects. The moving speed is large, but the speed will slow down when the load increases. The output force is related to the operating pressure. The reliability is high, but the valve cannot be adhered to after the gas source is interrupted. It is inconvenient to realize segmented control and program control. Maintenance is relatively simple, good adaptability to the environment; large output power; explosion-proof function. The above is the relevant content about the advantages and disadvantages of electric valves and pneumatic valves. Assuming that you have a demand for our company's products, please contact online customer service for specific inquiries, quotations and other information. You are also welcome to come to our company for inquiries and are sincerely invited to cooperate with you!

08

2022

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10

In the purchase of pneumatic ball valve should pay attention to what problems

In the purchase of pneumatic ball valve should pay attention to what problems

Wuxi Xinming automatic control valve industry co., ltd. today details for you what problems should be paid attention to when purchasing pneumatic ball valves In industrial activities, the use of valves can be a good control of the development of industrial activities, and can ensure the safety of personnel and enterprise material savings, especially the pneumatic ball valve, through the collocation of various other accessories, can end many risks and even high-altitude work, to ensure the safety of people's lives and production. So pneumatic ball valve in the purchase should pay attention to what problem? Below, let's take a look at it. 1. Price is one of the factors that need to be referred. When choosing pneumatic ball valve, in addition to referring to the above two aspects, the price of pneumatic ball valve should also be considered. I am afraid that too low a price cannot guarantee the quality. As the production of any valve requires cost, the so-called "a penny for a penny", if the price is too low, almost even the cost cannot be guaranteed, then the quality problem is also worrying. 2, the selection of good quality pneumatic ball valve If you want to buy the pneumatic ball valve can operate well and ensure the operation effect, then your selection is very important. Buyers can first understand and compare some valve brands at home and abroad, which can effectively prevent the purchase of fake and inferior products from small manufacturers. Moreover, you can also check the credibility of the selection of pneumatic ball valves, which can provide outstanding quality assurance. In addition to this, it should also be based on the buyer's own standards to select the pneumatic ball valve, because the appropriate standards can not only ensure the use of the effect, but also to prevent safety accidents. 3, select the address to buy pneumatic ball valve At present, the purchase of pneumatic ball valve address selection is nothing more than network ordering and direct purchase of these two methods. Online ordering is generally aimed at purchasing valves produced by far away or foreign manufacturers. However, the defect of online ordering is that it is impossible to inspect the real objects. It is impossible to see the real and effective valve entities based on pictures and other instructions alone, and it is also relatively difficult to select standards. It can also be purchased directly. Buyers can go to the manufacturer or distributor for on-site purchase, so that the selectability will be added. Together, buyers can also consult on the use and maintenance of pneumatic ball valves, which can deepen their understanding and knowledge of the valves, and can also play a certain role in assisting the devices and applications. These are the questions that should be paid attention to when purchasing pneumatic ball valves. Assuming that you have a demand for our products, please contact online customer service for specific inquiries, quotations and other information. You are also welcome to come to our company for inquiries and are sincerely invited to cooperate with you!

09

2022

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10

What are the common problems of pneumatic control valve?

What are the common problems of pneumatic control valve?

Wuxi xinming automatic control valve industry limited company tell you what are the common problems of pneumatic control valve?

29

2022

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10

The role and use of pneumatic control valve?

The role and use of pneumatic control valve?

Wuxi Xinming automatic control valve industry Co., Ltd. tell you the role and use of pneumatic control valve? (on)

07

2022

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11

What are the advantages and disadvantages of pneumatic control valve compared to electric control valve?

What are the advantages and disadvantages of pneumatic control valve compared to electric control valve?

Wuxi xinming automatic control valve industry limited company tell you what are the advantages and disadvantages of comparison of electric control valve pneumatic valve? Pneumatic control valve is based on compressed air as the power source, with the cylinder as the actuator, through the electric valve positioner, converter, solenoid valve, a valve accessories drive valve, to achieve the switch or proportional adjustment, industrial automation control system to receive the control signal, complete the pipeline medium adjustment: flow, pressure, temperature and other process parameters. Pneumatic control valve is characterized by simple control, fast response, high safety, no additional explosion-proof measures. Pneumatic control valve action gas open gas closed two kinds. Air open type is when the air pressure on the membrane head increases, the valve moves in the direction of increasing opening, and when the upper limit of the input pressure is reached, the valve is in a fully open state. Conversely, when the air pressure decreases, the valve moves in the closing direction, and when there is no air input, the valve is completely closed. Therefore, sometimes the air-open valve is also called a fail-closed type. The wind-off type moves in the opposite direction to the wind-on type. When the air pressure rises, the valve moves in the closing direction; when the air pressure decreases or does not decrease, the valve moves in the opening direction or completely opens until it is closed. Therefore, it is sometimes referred to as a fail-open type. Pneumatic control valve gas on or off, usually through the positive and negative effects of the actuator and the valve structure of the different assembly. The choice of gas-on-gas-off is based on the safety of process production. When the gas supply is cut off, is it safe for the regulator to be in the closed position or the open position? For example, in the combustion control of the heating furnace, a control valve is installed in the fuel pipe to control the fuel supply according to the temperature of the heating furnace or the temperature of the heated material at the outlet of the heating furnace. At this time, choose the gas open valve safety, because once the gas supply stops, the valve closed than the valve fully open more appropriate. If the air supply is interrupted and the fuel valve is fully open, dangerous overheating may occur. As a heat exchange equipment cooled by cooling water, the thermal material is cooled by water in the heat exchanger. The regulating valve is installed on the cooling water pipe. After the heat exchange material is used to control the cooling water temperature, the air source is interrupted and the regulator should be In the open position, it is safe, and the closed type (FO) regulator is appropriately selected. The gas-open type is changed to the gas-closed type or the gas-closed type is changed to the gas-open type. If the regulator is equipped with a smart valve positioner, it can be easily switched in the field. However, there are also some occasions when the valve is not expected to be in the fully open or fully closed position, it is not allowed to operate, but it is expected to remain in the original position before the failure. At this time, some other measures can be taken, such as the use of position maintaining valves or the installation of emergency special gas cylinders and other facilities to ensure safety. Precautions for the use of pneumatic control valves: 1. The valve should be stored in a dry room, and both ends of the path are blocked. Stacking is not allowed 2. Regulating valves stored for a long time should be checked regularly to remove dirt, and anti-rust oil should be applied to moving parts and processed surfaces to prevent rust. 3, the valve should be installed on the horizontal pipeline, requiring vertical installation. Stand up. 4. Forced installation according to the medium flow direction indicated by the arrow in the figure. The above is the content of our company today, if you have any advice, please call our company!

19

2022

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11

Common faults of pneumatic control valve pneumatic system

Common faults of pneumatic control valve pneumatic system

Wuxi Xinming automatic control valve industry co., ltd. tells you the common faults of pneumatic control valve pneumatic system Poor quality of the pneumatic control valve is a common pneumatic system failure. Analysis of effects and failures caused by moisture Moisture is formed when the compressor sucks wet air and cools. The moisture of the steam regulating valve causes the components of the pneumatic device to rust and affect the action of the pneumatic components. The effects of moisture are as follows. 1. Pipelines. Cause rust inside the pipeline; pipeline corrosion, resulting in air leakage, container rupture; the bottom of the pipeline stagnant moisture caused by insufficient air flow, increased pressure loss. 2. Components. Rust in the pipeline accelerates the blockage of the filter mesh, causing the filter to fail to work. Rust inside the tube enters the valve, causing poor action and air leakage. Parts that affect pneumatic components, causing poor conversion, air leakage and unstable action; Water droplets invade the valve body, causing poor action; Water droplets enter the components to prevent smooth operation; Water droplets flush lubricating oil, causing poor lubrication and valve failure, the operation of the actuator is unstable; the water droplets in the valve cause insufficient flow and increased pressure loss; the water hammer phenomenon causes component damage. 3. The environment. The discharge water from the exhaust port will pollute the environment. The fault treatment method that can be used for the fault caused by the moisture of the electric control valve is water removal, that is, the compressor outlet temperature drops to make the water contained in the water drop and exclude it. To this end, coolers and separators should be installed and installed after the compressor, and air filters should be installed at the compressor. The horizontal pipe has a certain slope, and the drain valve is installed at the low end. Outlet mount dryer. The water removal measures that can be used are as follows. a. Adsorption water removal method: adsorbing water with materials with strong adsorption capacity, such as silica gel, aluminum gel and molecular sieve, etc. B. Pressure dehumidification method: increase the pressure to reduce the volume and reduce the temperature, thereby precipitating water droplets. c. Mechanical water removal: water removal by mechanical blocking, cyclone separation, etc. D. freezing and water removal: use refrigeration equipment to cool the air to the dew point below, so that water vapor condensation into water precipitation. Analysis of Influence and Failure Caused by Oil The compressor lubricating oil is mixed into the compressed air in the form of oil mist, and the pneumatic control valve is sent out with the compressed air under heat, which is the reason why the compressed air contains oil. The effect of the oil content is as follows. 1. Sealing ring deformation. The sealing ring shrinks, the air leakage valve fails to act, and the output force of the actuator is insufficient; the sealing ring bubbles and swells, the friction force increases, the valve cannot act or the output force of the actuator is insufficient; the sealing ring hardens, the friction surface is worn, and the air leakage increases. Increase; friction increases, the valve and the actuator are not acting properly. 2. The environment. Industrial raw materials chemicals directly contact the air places to change the nature of raw materials chemicals; Industrial furnaces and other places in direct contact with flame cause fire hazard; Metering instruments using air fail due to nozzle blockage; It is required to avoid oil environment extremely. Due to the leakage of oil from the sealing part of valves and actuators, environmental pollution is caused by oil removal filter. For example, with a centrifugal filter in addition to oil mist particles, with activated carbon adsorption or with a porous filter in addition to oil. The above is the content of our company today, if you have any advice, please call our company!

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2022

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