【Daily Question No. 009】2017.01.09
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This post was last edited by 955559 on 2017-7-31 at 16:03. [Daily Question No. 009] Date: 2017.01.09. The working principle of a safety valve in pressure vessels is ( ). The reference answers can be seen after *replying*; points will be awarded for identifying the key points. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) When the pressure exceeds the set value of the safety valve, it opens automatically to release pressure, ensuring that the pressure of the medium inside the equipment remains below the set level. This helps to maintain the proper functioning of the equipment and prevents accidents. Summary thread of Q&A questions from 2017 (updates ongoing): http://bbs.hcbbs.com/thread-1657793-1-1.html Summary thread of daily questions from 2017 (updates ongoing): http://bbs.hcbbs.com/thread-1657794-1-1.html Summary thread of Q&A questions from 2016 (already updated): http://bbs.hcbbs.com/thread-1597792-1-1.html New Normal Cup – 2016 HaiChuan Top 10 Selections – Please recommend candidates: http://bbs.hcbbs.com/thread-1654112-1-1.html Third round of evaluation for outstanding management members at HaiChuan: http://bbs.hcbbs.com/thread-1655902-1-1.html (Source: HaiChuan Chemical Forum)
When the pressure in the container exceeds the specified value, the safety valve opens automatically to release the excessive pressure inside the vessel, thereby preventing damage to the container or pipelines. When the pressure inside the container drops to the normal operating pressure, it automatically shuts off to prevent all the gas from being discharged due to overpressure in the container, thereby avoiding waste and production interruptions.
The opening pressure setting of the safety valve is generally less than or equal to the design pressure of the container. When the pressure inside the container is lower than the opening pressure, the safety valve remains closed. When the pressure exceeds the opening pressure of the safety valve, it opens to release the excess pressure and then returns to its original position. This cycle repeats itself, preventing the pressure vessel from experiencing overpressure and thus ensuring its safety to the greatest extent possible.
When the pressure in the container exceeds the specified value, the safety valve opens automatically to release the excessive pressure inside the vessel, thereby preventing damage to the container or pipelines. When the pressure inside the container drops to the normal operating pressure, it shuts off automatically, preventing all the gas from being released due to overpressure in the container and thus avoiding waste and production disruptions.
When the spring force is greater than the normal pressure exerted by the medium on the valve core (a pre-determined pressure value), the valve core remains in the closed position. When the pressure of the medium inside the tank exceeds the allowable level, the spring is compressed, causing the valve core to move away from the valve seat and the valve to open automatically, allowing the medium to flow out and the pressure to be reduced. Once the pressure returns to normal levels, the spring force pushes the valve core back against the valve seat, causing the valve to close automatically.
When the pressure exceeds the operating pressure, the safety valve opens automatically to release pressure, until it drops below the specified level
Once the starting pressure is reached, it is vented; once it drops to the return pressure, it is closed
When the steam pressure below the valve disc of the safety valve exceeds the compressive force of the spring, the valve disc is pushed open. After the valve disc is pushed open, the escaping steam acts on the valve disc clamping ring due to the rebound of the lower adjusting ring, causing the valve to open rapidly. As the valve disc moves upward, steam impacts the upper adjusting ring, causing the steam to be discharged vertically downward. The reaction force generated by the steam pushes the valve disc upward, and within a certain pressure range, it keeps the valve disc at an adequate elevated position. As the safety valve opens, steam continues to be discharged, and the steam pressure in the system gradually decreases. At this point, the force exerted by the spring will overcome the steam pressure acting on the valve disc as well as the reaction force from the exhaust steam, thereby closing the safety valve
When the pressure reaches a certain value, the spring expands
The valve opens automatically when the production operation pressure exceeds the set value. It shuts off automatically after being lowered to the set position.
The working principle of a pressure vessel safety valve is that when the steam pressure below the valve disc exceeds the compressive force of the spring, the valve disc is pushed open. After the valve disc is pushed open, the escaping steam acts on the valve disc clamping ring due to the rebound of the lower adjusting ring, causing the valve to open rapidly. To achieve the purpose of pressure relief).