The body must be cleaned before installed and there is no dirt and sundries clinging to the body , especially pay attention to the sealing surface and the rubber sealing ring 安装前必须清洁盲板阀内腔，不允许有任何杂物和污垢附着（特别注意密封面、橡胶密封圈的清洁） 。
Special hints : in the maintenance of product , make sure not to lose or damage all the rubber seal - rings in the process . otherwise the airproof performance and using effect will be seriously affected 特别提示：在维护产品时，拆装过程特别要注意所有的橡胶密封圈不能丢失或损坏，否则将严重影响其密封性能及使用效果。
Xingtai city rubber factory is founded in 1962 , which has thirty years history , area 2260 thousand square meters and fixed assets 30 million . now there are 500 employees and all kinds of specialized technicians over 100 邢台市橡胶厂始建于1962年，现有职工300人，各类专业技术人员50人，总资产2500万，年产值3000万，是河北省橡胶行业给排水系列橡胶密封圈最大生产厂家。
