AS568A简称星形圈，又称形圈，其规格尺寸用内径和截面直径表示。星形圈是一种可以对两个方向起密封作用的密封元件，安装在各种形式的沟槽中其径向或轴向预压缩赋予星形圈初始密封能力，它随压力的提高而增大其密封力。在压力作用下，星形圈的截面形状会使压力向各方面均匀地传递，故具有良好的密封效果。与型圈相比优点如下：>由于其截面形状为四个密封唇，在沟槽中不产生扭曲，所以在往复运动时不会在沟槽中滚动>摩擦力小，因为它要求比型圈小的预压缩。较小的压缩意味着较小的摩擦力和磨损，从而有较长的寿命。>密封效果非常好，由于在星形圈截面上有较好的压力分布，从而可获得非常好的密封效果。>在密封唇之间形成润滑容腔，改善了启动状况。>与型圈不同，它的分型飞边处于截面凹处，即两个密封唇之间，且远离唇口位置。截径沟槽尺寸槽底角倒圆径向最大间隙沟槽深度沟槽宽度静密封动密封为挡圈厚注：括号内为材料是氟橡胶的沟槽尺寸；当使用挡圈时，宽度皿皿|im矩形安装沟槽侧面可加工成倾斜（如图角度），但如使用挡圈则侧面必须是垂直的密封类型表面压力m径向配合表面<<<10.2010.7712.3713.9414.7014.8015.5416.2017.1218.7220.2921.8923.4725.0726.6428.2429.8231.4232.9934.5936.1737.7739.3440.9442.5244.1245.6947.2948.9050.4752.0753.6455.2556.8258.4259.9961.6063.1764.7766.3467.9569.5271.1272.6975.8782.2288.5794.92101.27107.62113.97120.32126.67133.02139.37145.72152.07158.42164.77171.12177.47183.82190.17196.52202.87209.22215.57221.92228.27234.62240.97247.324.345.947.529.1210.6912.2913.8715.4717.0418.2018.6420.2221.8223.3924.9926.5728.1729.7431.3432.9234.5236.093.5337.6940.8744.0447.0250.3953.5756.7459.9263.0966.2769.4472.6275.7978.9782.1485.3288.4991.6794.8498.02101.19104.37107.54110.72113.89117.07120.24123.42126.59129.77132.94136.12139.29142.47145.64148.82151.99158.34164.69171.04177.39183.74190.09196.44202.79209.14215.49221.84228.19234.54240.89247.24253.59266.29278.99291.69304.39329.79355.19380.59405.26430.66456.0610.4612.0713.6415.2416.8118.4219.9921.5923.1624.7726.3427.9429.5131.1232.6934.2937.4739.2040.6443.8245.2046.9950.1753.3456.5259.6962.8766.0469.2272.3975.5778.7481.9285.0988.2791.4494.6297.79100.97104.14107.32110.49113.67116.845.33120.021...
