Detailed explanation of the function and structure principle of automobile pneumatic butterfly valve
In the automobile suspension, the pneumatic butterfly valve is always used in conjunction with the spring. When we press down a corner of the body, it is the spring that tightens in practice, and the corresponding swing arm swings. When the vehicle is released, the body will bounce back under the spring force. At this time, the pneumatic butterfly valve plays a damping role on the spring bounce, that is, it tends to be stable after bounce. If there is no pneumatic butterfly valve, the spring will be tightened again after rebounding, which means that the body tends to be stable after repeated rebounds. So the pneumatic butterfly valve is used to damp and shock the spring of the automobile suspension when it rebounds.
The hydraulic pneumatic butterfly valve for automobiles is filled with special oil for pneumatic butterfly valve. The internal part is composed of two cylinders: storage cylinder and working cylinder. The piston divides the working cylinder into upper chamber and lower chamber. A stretching valve and a flow valve are arranged on the piston to control the movement of oil between the upper cavity and the lower cavity; The tightening valve and compensation valve between the lower chamber of the working cylinder and the oil storage cylinder are used for the movement of oil between the lower chamber and the oil storage cylinder.
When the pneumatic butterfly valve is tightened, the piston goes down, the volume of the upper chamber increases, and the volume of the lower chamber decreases. The flow valve opens, and the oil in the lower chamber enters the upper chamber through the flow valve; At the same time, a part of the oil flows into the oil storage cylinder by turning over the tightening valve. The throttling effect of these two valves on the oil makes the pneumatic butterfly valve have a damping effect during the contraction movement.
When the pneumatic butterfly valve is extended, the piston goes up, the volume of the upper chamber decreases and the volume of the lower chamber increases, the stretching valve opens, and the oil in the upper chamber enters the lower chamber through the stretching valve; At the same time, a part of the oil turns over for compensation and enters the lower chamber from the oil storage cylinder. The throttling effect of these two valves on the oil makes the pneumatic butterfly valve have a damping effect when it stretches.
Since the spring force of the stretching valve is greater than that of the flow valve, and the flow area of the valve hole of the stretching valve is smaller than that of the flow valve, the damping force generated by the stretching stroke of the shock absorber is greater than the damping force generated by the tightening stroke, reaching the request of rapidly reducing the spring shock.

Application of casing compensator
In the design of the compensator, the stability of the bellows should be considered to prevent the instability of the bellows. The material shows that the compensation amount of bellows depends on its fatigue life. The higher the fatigue life, the smaller the single wave compensation amount of bellows. In order to reduce the cost and improve the single wave compensation, the lower the allowable fatigue life, the greater the longitudinal bending stress of the bellows caused by displacement, and the higher the comprehensive stress, which greatly reduces the stability of the bellows. When the allowable service life of the bellows design is low, not only the meridian comprehensive stress is high, but also the circumferential stress is relatively high, which makes the bellows enter plastic deformation quickly, leading to the instability of the bellows and causing failure. In addition to the design, the data selection of the compensator is also quite critical. For the selection of materials used for this product, in addition to the working medium, working temperature and external environment, the possibility of stress corrosion, the impact of water treatment agent and pipeline cleaning agent on the data, etc. should also be considered, and on this basis, the welding and molding of bellows data, as well as the performance price ratio of the data should be separated, so as to select the applicable bellows manufacturing data that meet the working conditions. Experts suggest that the data for selecting compensator should meet the following conditions:
(1) Good plasticity, convenient for processing and forming, and sufficient hardness and strength can be obtained through subsequent treatment processes (cold work hardening, heat treatment, etc.).
(2) With high elastic limit, tensile strength and fatigue strength, the compensator ensures normal operation.
(3) Good welding performance, meeting the welding process requirements in the manufacturing process.
(4) Good corrosion resistance, meeting the requirements of working in different environments.
After the completion of the compensator product device, the yellow auxiliary positioning components and fasteners used for device transportation on the compensator shall be removed as soon as possible, and the limit installation shall be adjusted to the regular position according to the design requirements, so that the pipeline system has sufficient compensation ability under environmental conditions. The sleeve type compensator is a drainage pipe. All moving elements shall not be blocked or restricted by external components, and the normal action of all moving parts shall be ensured.
The application of this product has the following benefits:
1. The casing type compensator provides great convenience for the removal and replacement of various water supply and drainage pipelines, water towers, pumps and valves, and plays a very good role in regulating the expansion and contraction of long spacing pipelines due to temperature difference.
2. Before installing the sleeve type compensator, loosen the pressure plate bolt, pull the product to the length of the device, and then tighten it with the diagonal method. Cut the iron and press it off. If it is used overhead, corresponding fixed supports must be installed at both ends.
3. The GB/T9112-9124-2000 specification shall be adopted for flange connection. (Material Q235) During the installation of the drainage pipe, the sleeve compensator shall not allow the welding slag to splash on the surface of the wave case, and the wave case shall not be subject to other mechanical damage. Attention should be paid to analyzing the benefits of compensator for pulverized coal pipeline when replacing sleeve compensator
Sleeve compensators are widely used. As time goes by, we should timely replace the compensators that have reached the service life. So, what matters need attention in the process of change? Here, Songyue Pipeline should remind you of two points:
1. Find out the relevant raw materials, the model, pressure, connection mode and compensation amount of the compensator recorded according to the raw materials, and confirm the total length of the compensator practice device.
2. If there is no relevant raw material, in this case, confirm the escort medium, design pressure, total length, etc. of the compensator, and take photos to provide the consumer. When the compensation amount of the corrugated compensator is uncertain, the temperature of the escort medium and the interval between the two corrugated compensators shall be provided.
In addition, after the replacement of the new device is completed, we also need to remind everyone to remove the yellow auxiliary positioning components and fasteners used for device transportation on the compensator as soon as possible, and adjust the limit installation to the regular position according to the design requirements, so that the pipeline has sufficient compensation ability under the environmental conditions.
1、 Application range of pipe compensator:
The pulverized coal pipeline compensator is applicable to the compensation of thermal expansion and cold contraction of pulverized medium in the boiler pulverized coal conveying, pulverized coal feeding, exhaust gas and other pipelines in the power plant, and ensures no dust leakage.
2、 Advantages of pipeline compensator:
Most of the existing powder medium compensators in power plants are sleeve type compensators, whose working principle is that the packing in the packing box is used as the packing of the sealing body, and after being compressed by the packing gland, it shrinks to all the gaps in the packing box, completing the isolation of the medium in the pipe from the atmosphere. After several cycles of thermal expansion and cold contraction, this sleeve type compensator will leave a gap between the filler and the inner and outer walls of the stuffing box. The dust in the pipeline will leak into the atmosphere through the gap, or burst due to the collection of powder. The leaked dust not only pollutes the air, but also accumulates in the air and on the cable bridge, which will hinder environmental health and may cause a fire.
The inner wall of the product is lined with a rare earth wear-resistant alloy steel sleeve, which can not only compensate for the thermal expansion and cold contraction of the pipeline, but also ensure that the coal powder does not wear the vulnerable pipe wall of the contraction joint. It has the following characteristics:
1. With expansion and contraction; Tight without leakage; It has three functions of anti-corrosion and abrasion resistance.
2. The device is convenient and requires no maintenance. Access to the system can guarantee three years (30000 hours) without dust leakage (one overhaul period).
3. The patented design does not accumulate powder in the compensator.
4. It has fairly good flexibility and rigid core to absorb three-dimensional expansion and contraction, and good flexibility to ensure that the boiler and pipe system shrink freely.