03 03,2025

To strengthen the work of production safety and effectively prevent safety risks, the Emergency Management Bureau of Longkou City, in accordance with the requirements of the "Notice on Issuing the Implementation Plan for the Concentrated Rectification Campaign to Prevent Mechanical Injury and Object Strike Accidents in the Industrial and Trade Sectors", has launched a 100-day concentrated rectification campaign for enterprises involved in mechanical injury and object strike throughout the city.Comprehensively mobilize and deploy to consolidate the foundation of work. On the one hand, organize enterprises to attend the mobilization and deployment meeting of the Yantai Emergency Management Bureau. Through conducting accident warning education, carrying out special training and education, and elaborately interpreting the action plan, enhance the safety awareness and action cognition of enterprises. After the meeting, Longkou City promptly held a follow-up meeting, once again mobilizing and emphasizing the key points of the action. It required the deputy leaders in charge of each town and sub-district to preside over a special meeting to make detailed arrangements for the 100-day offensive action, and the Industry and Trade Section arranged dedicated personnel to attend and provide guidance. On the other hand, closely monitor the self-examination and self-correction work of enterprises, urge the main responsible persons of enterprises to organize and hold special rectification mobilization meetings, take the lead in conveying and studying the special rectification action plan and relevant standards, and after the main responsible persons of each enterprise thoroughly understand the spirit of mobilization and deployment and carefully study the standards and norms, take the lead in organizing all departments, workshops, teams and employees within the enterprise to carry out comprehensive self-examination and self-correction Conduct a thorough inspection of the equipment and facilities that may cause mechanical injuries and object strike accidents one by one.Conduct in-depth self-examination and self-correction, and strengthen the primary responsibility of enterprises. Actively guide and supervise enterprises involved in mechanical injury and object strike risks to carry out self-examination and self-correction work in a solid manner in accordance with the checklist. The main person in charge of the enterprise personally took charge and organized all employees to conduct a thorough inspection of each job position, equipment and facilities, as well as operation links. Up to now, 325 enterprises have completed self-inspections. During this process, a total of 10,047 potential problems were identified and rectified. In response to the problems and potential risks identified through self-inspection, all enterprises have clearly defined rectification measures and deadlines, strictly implementing closed-loop management for risk rectification to ensure that all risks are properly addressed.Strengthen law enforcement and inspection efforts and enhance the efficiency of safety supervision. In order to better complete the work of the supervision and inspection stage in the next step, Longkou City will strengthen the business training of regulatory personnel and improve their professional quality. Unite all towns and sub-districts, and at the same time give full play to the guiding role of experts from third-party assistance institutions to form a regulatory synergy. By using video surveillance and the dust early warning system of Shandong Province, online inspections of enterprises are conducted to continuously enhance their safety management level. During the inspection process, strict checks are carried out in accordance with the inspection standards. Any major hazards found or enterprises that refuse to rectify will be subject to strict law enforcement.

05 25,2025

The electric flanged ventilation butterfly valve has a compact structure, is lightweight, easy to install, has low flow resistance, large flow capacity, avoids the influence of high-temperature expansion, and is easy to operate. Meanwhile, there are no connecting rods, bolts, etc. inside the body, ensuring reliable operation and a long service life. It can be installed at multiple stations and is not affected by the flow direction of the medium. It is applicable to pipelines with a medium temperature of no more than 300℃ and a nominal pressure of 0.1Mpa in the production processes of building materials, metallurgy, mining, power, etc., for connecting, opening and closing or regulating the medium mass. Among them, the electric flanged ventilation butterfly valve can be made of suitable materials to meet the requirements of low, medium and high medium temperatures as well as corrosive media, which is unmatched by other types of valves.The electric flanged ventilation butterfly valve is designed and manufactured in a new structural form with a centerline disc welded to a short structural steel plate. It features a compact structure, light weight, easy installation, low flow resistance, large flow capacity, avoids the influence of high-temperature expansion, and is easy to operate. There are no connecting rods, bolts, etc. inside the body, ensuring reliable operation and a long service life. It can be installed at multiple stations and is not affected by the flow direction of the medium.The application features of the electric flanged ventilation butterfly valveThe electric flanged ventilation butterfly valve is a non-airtight butterfly valve, suitable for use in the production processes of building materials, metallurgy, mining, power and other industries, where the medium temperature is ≤300℃ and the nominal pressure is 0.1Mpa, for connecting, opening and closing or regulating the medium mass. The electric flanged ventilation butterfly valve is mainly used in the ventilation and environmental protection projects of industries such as gold, chemical engineering, building materials, power stations, and glass, in the gas pipelines containing dust and cold or hot air, serving as a device for regulating the flow or cutting off the gas medium. The electric flanged ventilation butterfly valve is designed and manufactured in a new structural form with a centerline disc welded to a short structural steel plate.Five major features of the electric flanged ventilation butterfly valveThe electric flanged ventilation butterfly valve is designed and manufactured in a new structural form with a centerline disc welded to a short structural steel plate, which avoids the influence of high-temperature expansion and is easy to operate.2. It has no connecting rods, bolts, etc. inside, operates reliably and has a long service life. It can be installed at multiple stations and is not affected by the flow direction of the medium.3. The design is novel, reasonable, with a unique structure, light weight and quick opening and closing.4. The electric flanged ventilation butterfly valve has a small operating torque, is easy to operate, and is labor-saving and flexible.5. The electric flanged ventilation butterfly valve is made of suitable materials to meet the requirements of low, medium and high medium temperatures as well as corrosive media, etc.

05 25,2025

1. Overview of Spherical Check ValvesSpherical check valves are widely used in devices such as petroleum, chemical, and power heating boilers. They are mainly used to prevent the reverse flow of media in pipelines and protect the safe operation of equipment. They are ideal check devices for pipelines. However, at present, the common check valve structures include swing type and lift type, etc. Due to the problems of easy jamming, poor sealing and difficult maintenance of these common types of check valves, and the fact that they may cause serious water hammer when closing by themselves, and the water hammer pressure far exceeds the working pressure of the system, it may endanger the safety of the system. Therefore, in addition to meeting the basic requirements of flow rate, the design of a check valve is most importantly about the size of the flow resistance and whether there is any overflow or vortex. This is related to energy consumption and also affects the level of production cost and the competitiveness of the product. The new type of spherical check valve is designed based on the theory of reducing flow resistance and eliminating water hammer./uploads/allimg/190506/1-1Z5060941300-L.png 2. Structural features of spherical check valvesThe spherical check valve has no transmission parts in structure and a free opening and closing structure, so there is no wear on the shaft and shaft sleeve. The valve disc rotates automatically in the spherical track, constantly updating the sealing surface, and there are no fixed wear points. During operation, the spherical surface wears evenly and always maintains a high shape accuracy. Its performance will not decline over time, thus extending the service life of the seal. The surface of the valve disc is lined with rubber. The dimensional accuracy and surface roughness of the ball can be controlled by the rubber-lined mold. The processing accuracy requirements for the ball are reduced, and it can be reused, which lowers the cost of the valve disc. The rubber on the surface of the steel ball can elastically deform, absorb and reduce vibration, and play a certain buffering role. The low density of rubber makes the inertia of the valve disc movement small and the action sensitive. The sphere adopts a hollow structure, which is light in weight and reduces the impact force of the valve disc on the valve seat when closing. The inner diameter of the spherical track is designed to be larger than the pipe diameter of the corresponding flange, increasing the flow cross-section, reducing the medium resistance and pressure drop. When the sealing structure is designed according to the corresponding flange, the working pressure is vacuum to medium pressure. Under the condition that the installation is not restricted, the spherical check valve can be installed either horizontally or vertically. Moreover, this valve is convenient to maintain on the pipeline. Only the lower valve disc needs to be replaced.3. Working Principle of Spherical Check ValveSpherical check valveThe spherical check valve shown in the above figure consists of a valve body, a valve seat 2, a valve cover 7, and a valve disc. The valve body is composed of a left valve body 5 and a right valve body 1. The right valve body is the medium inlet end, and the left valve body is the medium outlet end. The valve seat 2 is installed between the left valve body 5 and the right valve body 1. The valve disc is a sphere 3. The sealing surface of the valve seat 2 is a spherical surface that fits with the surface of the sphere 3. The left valve body is composed of a fluid channel and a sphere track. The centerline of the sphere track forms an acute Angle with the centerline of the fluid channel. The Angle design of this acute Angle is determined based on whether the valve disc 3 can rise and fall flexibly within the sphere track. At the intersection of the fluid channel and the spherical track, an arc-shaped filter screen 6 is set. This arc-shaped filter screen 6 has the same curvature as the inner wall of the spherical track, so that the inner arc of the arc-shaped filter screen 6 and the inner wall of the spherical track form an integral inner cylindrical surface, creating a smooth rolling channel for the valve disc 3. It not only does not affect the flow of the medium but also enables the valve disc 3 to roll flexibly. This spherical check valve automatically controls the rolling position of the sphere within the spherical track by utilizing the thrust of the medium and the gravity of the valve disc. When the medium flows forward, the thrust of the medium pushes the valve disc to roll to the upper end of the spherical track. When the forward thrust of the medium disappears, the valve disc rolls off the upper end of the spherical track to seal and fit with the valve seat. It has the advantages of simple structure, the sphere is not easy to be stuck in the spherical track, good sealing reliability and small water hammer.