橡胶密封用于防止空气向真空系统渗漏。高真空阀的固定连接密封要在-50到50℃温度下,长时间同时承受大气压空气和0.13毫巴余压真空或0.13毫巴到0.13巴余压真空的作用。在密封使用过程中,不拆卸法兰连接。表征这类密封工作能力的主要指标是压缩永久变形C(ΓОСТ9029-74)和压缩应力老系化数Kp(ΓОСТ 9982-76)。与有压力的密封不同,固定连接的真空密封的泄漏临界值C要从一般的80％降到6O～70％,而Kp值则要从0.1升高到0.2～0.4 Rubber seals prevent air from leaking into the vacuum system. High vacuum valve fixed connection to the seal at -50 to 50 ℃ temperature, long time to withstand both atmospheric pressure and 0.13 mb vacuum or 0.13 mb to 0.13 bar residual vacuum role. In sealed use, do not disassemble the flange connection. The main indicators that characterize this type of sealing work are compression set C (ΓОСТ9029-74) and compressive stress series Kp (ΓОСТ 9982-76). Unlike pressure-tight seals, the leak-critical leakage C for a fixed connection drops from 80% to 60% to 70%, while the Kp value increases from 0.1 to 0.2 to 0.4