The pivots are located just above the center of the disc, and offset from the plane of the body seat.
枢轴就位于阀瓣中心上，偏离阀体阀座平面。
Planographic printing: printing from a plate where the images and non-images are on the same plane. For example, lithographic printing, offset and collotype.
平版印刷：印版上的印纹和非印纹在同一个平面上的印刷方法。例如：石印、柯式和珂罗版印刷。
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