共查询到19条相似文献,搜索用时 905 毫秒
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刘再天 《机械工人(冷加工)》1990,(8):48-49
提高截止阀密封性能是解决管路“三漏”的主要途径,为此,我们对截止阀进行了改进,效果较好。 一、截止阀密封性能下降的原因 普通截止阀的结构如图1所示,其启闭件是(?)盘1和阀(?)2。它的截止 相似文献
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介绍了影响Y形截止阀流通能力的因素,分析了Y形截止阀阀体的结构特性并分别按其性能参数给出了试验结果,提出了改善Y形截止阀流通能力的措施和方法。 相似文献
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液氢截止阀按绝热形式分主要有外堆积绝热和真空多层绝热,本文主要针对该液氢阀门结构进行了分析。阀门在整体上采用了真空夹层结构,阀杆选用了波纹管密封结构,阀座和阀体一体加工成形,并且阀盖组件可以从阀体中整体抽出,方便的实现了阀瓣的快速更换和维修。该阀门结构形式已经申请国家专利(申请号:200720186326.3)。 相似文献
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Globe valves are one of the oldest and most widely used flow control valves. However, cavitation due to high-pressure drop is a common phenomenon in such valves, reducing valve lifetime and increasing replacement costs. Recently, a series of perforated cages have been used in globe valves to reduce cavitation damage (especially in the body and disk). In this study, a globe valve is numerically investigated under four different structures, i.e., without the cage, with a perforated cage whose holes are radial, with a perforated cage whose holes are facing upwards, and with a perforated cage whose holes are facing downwards. The effects of the valve opening, inlet velocity, and holes direction on the pressure drop and cavitation incipient/intensity are investigated. The results show that cavitation is observed with the decrease of the valve opening even at the low velocities. And with increasing the velocity inlet, the pressure drop and cavitation intensity increase significantly. It can also be concluded that in the globe valve using a perforated cage with holes downwards, less cavitation is observed than in other models. Therefore, this configuration is proposed to protect the inner components of the valve (such as seat, seal, and plug) from cavitation damage. 相似文献
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