介绍了能安全可靠地在真空自耗电弧炉中炼钛时的高温、污染的环境下长期使用的闭锁阀的研制、阀的结构原理和实用中提高生产效率的例子。 The development of long-term use of the lock-up valve, the structural principle of the valve, and the example of improving the production efficiency in practical use are introduced in the article, which can safely and reliably be carried out under the conditions of high temperature and pollution when titanium is made in a vacuum consumable electric arc furnace.