The sealing element of the needle valve plays a role in cutting off and connecting, adjusting, distributing, separating, and mixing media on the channel. Therefore, the sealing surface is often corroded, eroded, and worn by the media, which is easy to damage. The causes of damage to the sealing surface of the card sleeve needle valve can be divided into two types: artificial damage and natural damage. Human damage is caused by factors such as poor design, poor manufacturing, improper material selection, improper installation, poor use, and inadequate maintenance. Natural damage refers to the wear and tear of the valve under normal working conditions, which is caused by inevitable corrosion and erosion of the sealing surface by the medium. The causes of damage to the sealing surface of the card sleeve needle valve are roughly as follows:
There are many forms of sleeve joints, and the sleeve is a metal ring with a sharp edge at one end of the inner circle. When connecting, first screw the connector body into the interface of the hydraulic component, then place the connecting pipe into the connector body and tighten it, and then use a nut to press the sleeve tightly. During the compression process, the blade of the sleeve cuts into the outer surface of the connecting pipe, forming a sealing surface. At the same time, the sleeve deforms and arches, making contact with the inner conical surface of the joint body to form a spherical sealing surface. Whether the cutting edge of the sleeve can cut into the oil pipe is the key to connection and sealing, otherwise there is a possibility of oil pipe detachment accidents during operation.
The card sleeve needle valve is a valve product used for precise flow control, and the valve disc is usually an integrated structure with the valve stem. This article mainly introduces the anti-corrosion aspects that need to be taken into account for the sleeve needle valve.
Hoses are important components in modern industry. Hoses are mainly used as wire and cable protection pipes for wires, cables, automation instrument signals, and civilian shower hoses, with specifications ranging from 3mm to 150mm. Small caliber hoses (inner diameter 3mm-25mm) are mainly used for the protection of sensing circuits in precision optical rulers and industrial sensor circuits.
Saw off seamless steel pipes of appropriate length and remove burrs at the ends. The end face of the pipe should be perpendicular to the axis, and the angle tolerance should not exceed 0.5 °. If the pipe needs to be bent, the length of the straight section from the end face of the pipe to the bent part shall not be less than three times the length of the nut.
When clamping the joint of the rubber hose, if the clamping size is too large, the inner rubber layer and winding steel wire of the hose will be broken, causing oil leakage. If the size is insufficient, if the pressure is too high during use, it will cause oil leakage, and even if the oil pressure is too high, the rubber hose joint will directly come out. If it hits the worker, it will cause injury or death.
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Operation Department, Ministry of industry and information technology of deputy inspector Jing Xiaobo analysis of the current situation of development of the industrial economy by the "unprecedented complex" to describe. Then, gradually disappear, the demographic dividend China international economic downturn, as well as the third industrial revolution background, where the development of the equipment manufacturing industry to Chinese? Around the above issues, organized by the center of research in manufacturing industry by LIAN international equipment equipment 2013 industrial development situation analysis meeting of the 2013 blue book "Conference" equipment industry recently held in beijing.
Recently, the CPC Central Committee, the State Council General Office Office issued the "about to guide the rural circulation of land management right in order agriculture moderate large-scale management development of opinions", and issued a notice, requirements of various departments and localities actual conscientiously implemented.