The tyre valve oil seal product introduced
　The valve stem oil seals are assembled on the duct of the in-exhaust valve to prevent overfull lubricating oil from entering the cylinder and combustor. They can reduce the amassment of carbon on the valve, improve the performance of the engine and reduce the environmental pollution caused by waste gas and save oil. In order to lubricate the duct and stem??it needs to be lubricated slightly, so they are called sealing of controlling volume of flow.
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