Industrial Valves Blog
Ball valve
The ball valve is evolved from the cock valve. Its opening and closing part is a sphere, which rotates 90 degrees around the axis of the valve stem to achieve the purpose of opening and closing. Ball valve is mainly used to cut off, distribute and change the direction of medium flow in pipeline. The ball valve with V-shaped opening also has good flow regulation function.
Continue reading “Advantages and Disadvantages of Ball Valves”
Advantages and Disadvantages of Gate Valves
Gate valve refers to the valve whose closing part (gate) moves vertically along the axis of the passage. It is mainly used as cutting medium in the pipeline, i.e. fully open or fully closed. Generally, gate valve can not be used as flow regulation. It can be applied to low temperature pressure can also be applied to high temperature and high pressure, and according to the different material of the valve. But gate valves are generally not used in pipelines for conveying mud and other media.
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Zirconia ceramics and alumina ceramic materials with specific performance comparison:
| Molecular Formula | Density kg/m^3 | Hardness HRC | Flexural Strength MPa | Fracture Toughness MPa 1/2 | Water Absorption | |
| Alumina ceramics | AL2O3 | 3.5 | 86-88 | 300-400 | 4 | 0 |
| Zirconia ceramics | ZrO2 | 5.9 | 88-89 | 900-1000 | 12 | 0 |
Alumina ceramic
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Taboos and Measures of Drainage Valve Pipeline Construction
1: The main materials, equipment and products used in construction are short of technical quality appraisal documents or product certificates that meet the current standards issued by the state or ministry. Consequences: The quality of the project is not up to standard, there are hidden dangers of accidents, can not be delivered on time for use, must be repaired, resulting in delays in the construction period, increased investment in labor and materials. Measures: The main materials, equipment and products used in water supply, drainage and heating and sanitation projects shall be technical quality appraisal documents or product qualification certificates issued by the state or ministry in accordance with the current standards; the product name, model, specifications, national quality standard code, date of departure, name and location of the manufacturer, inspection certificate or code of the manufacturer shall be marked.
2: The necessary quality inspection is not carried out before the valve is installed. Continue reading “Taboos and Measures of Drainage Valve Pipeline Construction”
I. Reasons for Rust of Stainless Steel Valves
To test whether stainless steel valves will rust, we can put the same valves in different environments to verify and compare. Generally speaking, if stainless steel valves are placed in relatively dry environments, after long time, the valves are not only as good as new, but also not rusty. But if the valves are placed in seawater containing a lot of salt, they will rust in a few days. Therefore, the corrosion resistance and stainless of stainless steel valves also need to be limited by the use environment. In addition, from the characteristics of stainless steel valve itself, it is stainless because there is a layer of chromium-rich oxide film on its surface to prevent particles such as oxygen atoms from invading and damaging objects, which makes it stainless. But when the film is destroyed by environmental factors, as oxygen atoms enter and iron ions free, stainless steel valve will produce rust.
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Welding Skill is very important for Some valve manufacture. Sangong’s pursuit of improving welding technology never stops. Last weekend, the Sangong welder have an deep communication with other skilled welder engineer after attend an welder exam local.
For the fish scale weld showed in competition,also named TIG( Tungsten invert gas welding)， is a kind of welding technology. Continue reading “Valve weld Skill improved: fish scale weld,TIG( Tungsten invert gas welding）”
Safety Operating Regulations for Welders-valve
1. Valve Welders are special types of work. They can operate independently only after they pass physical examination, professional and technical training, examination and issuance of “Operation Certificate for Special Types of Work”.
2. Welding grounding, prohibiting stacking of inflammable and explosive articles, should be equipped with fire fighting equipment to ensure adequate lighting and good ventilation.
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What does the American Standard Butterfly Valve API 609 Category B mean?
Perfect repair of large size gate valve
The waste valves replaced from the working site are corroded by various media, fluid pressure, and affected by different temperatures. The parts including the valve body are affected by different degrees and different locations and cause valve malfunction. The drop cannot even be used. However, the used old valves that have been ineffective at the “validation” are not worthless and have no remediation value. They cannot be repaired and used, as long as they use the principles of metal structure, dynamics, fluidics, corrosion protection, welding, and heat treatment. Knowledge, the provision of essential maintenance equipment and the establishment of an experienced professional team, can fully implement deep-level, high-grade, high-quality repair and refurbishment of used valves.
Valve in the use of the process , environmental impact is an important indicator of the performance of the valve. low valve leakage is an important parameter to evaluate the environmental protection performance. Valve low leakage requirements have become the basic requirements of the valve design and manufacturing. Usually means Fugitive Emission Requirment for valve.
In 2015, for the first time, API600 standards which was widely used in the valve industry , the valve low leakage test requirements API624 been joined the standard text. China National Standard (GB) hydrotreating device with the valve standard has also been clearly required in accordance with ISO15848 low leakage detection.