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1.Usually, the outer ring of the YC bearings has grease groove, bearings having no grease groove are to be provided,too.
YC外球面球轴承外圈一般带油槽，也生产外圈无油槽的产品。收藏指正
2.For the valve with the metal to metal seal,there is grease injector outside of it,grease gets into the sealing face through the injector and the seat ring to have the valve up to null leak.
金属对金属密封的阀门，阀体外部设有注油脂结构，油脂通过注脂器、阀座进入阀门密封面，使阀门达到零泄漏。收藏指正
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