Double eccentric wavy butterfly valve The wavy butterfly valve uses a multilateral shaft connection to ensure torque and zero clearance. Because of the valve shaft structure without keyway, the polygonal shaft can transmit more than 20% more torque than the valve shaft with the same diameter; At the same time, there is no need to drill holes on the valve plate of this structure to avoid the contact between the valve rod and the medium. The sealed bearing is safely isolated from the medium under the protection of the O-ring, so as to achieve effective sealing

4. The oil stain on the valve body is also a detail that cannot be ignored. The oil stain on the surface of the valve body directly determines the anti rust ability of the valve products, especially for the valve products of international manufacturers. Although the valve body has undergone anti rust treatment, the valve appearance is still as clean as new, and no oil stain will be found. For some fake valve products, in order to achieve the purpose of rust prevention, thick oil stains will be added on the valve surface, which will reduce the smoothness of the valve body itself. The above points are simple ways to identify valve products based on the appearance of the valve. Although only a few superficial remarks have been made, after careful debate, the obvious difference between true and false valves will still be found.