Some bullet - nose connections have a soft tipped nipple or an o - ring on the nipple to improve the seal 一些弹头接头具有一个软头管接口或在管接口上有一个o形圈，以改善密封。
Hollow metal o - ring is inhibited to pile up with other products , to avoid bruising , scoring and compression damage 1金属空心o形圈不允许与其它产品混合堆放，以防碰伤、划伤和压伤。
Promote condition to prevent parching , prolong continuous working time more than one time . larger applicant scope , both thin and glutinous materials can be adapted . only o - type ring should be replaced when maintaining without heavy tools and dead angles . wash thoroughly , high efficient , far more than coil heat exchanger . heat transmit coefficient is close to plate system , producing cost is high and the floor space is large 改善了结垢的状况，连续生产时间延长一倍以上，适用范围更加宽广，稀薄状、粘稠状物料均能胜任，维护时只要更换o形圈，无需笨重的工具，无死角，清洗彻底，效率高，换热效率远大于盘管式，传热系数接近板式，制造成本较高，占地面积较大。
9 series pressure cavity is made of stainless steel single unit integration structure by processing so may guarantee for the better seal performance . the characteristic of product are no o - ring , no welded , no silicon oil or other organic , structural durability ; the most apply to pump and compressor , liquid pressure and pneumatic system , go - anywhere vehicle , energy and water processing system , pressure instrument , refrigerating equipment , agricultural machinery device , locomotive braking system 9系列压力腔采用不锈钢单件一体式结构加工而成，因而可以保证较好的密封性能， 9系列产品的特点是无o形圈无焊缝无硅油或其它的有机物，经久耐用，主要应用于泵及压缩机，液压及气动系统越野车能源及水处理系统压力仪表冷冻设备农机设备机车刹车系统。
By comparing between the rectangular groove and curved groove , we find that two high stress area of rectangular groove o - ring occurs during the sealing period , and the wearing on the both inside and outside diameter surfaces ; the high stress area only happens at the part area of cone shaft , and the distribution of stress is more even than the former , and the wearing is on the inside diameter surface , the improvement of its distortions makes the service life of sealing lengthen 通过矩形槽和弧形槽的对比研究发现，矩形槽o形圈在密封过程中出现两个高应力区，磨损发生在内径、外径两个表面_匕，弧形槽o形圈的高应力区仅出现在牙爪轴邻近的局部区域内，应力分布较前者更为均匀，磨损进发生在内径表面，其受力变形状况的改善将使密封寿命进一步提高。
Therefore , the common rectangular groove seals are often be changed into the curved groove with some arc degree . when the o - ring acted as sealing function is placed in the curve groove with suitable design , its stress , strain and friction are all improved so as to lengthen the service life of sealing . the finite element method has guide meaning to analyze and design of structure 为此，普通矩形槽密封被尝试着改为具有一定弧度的弧形槽，当径向密封作用的o形圈被置于设计合理的弧形槽内，其受力、变形和摩擦状况均得到改善，有助于密封寿命的提;锐有限元法对结构的分析和设计具有指导意义。
