Welding Neck Flanges are easy to recognize at the long tapered hub, that goes gradually over to the wall thickness from a pipe or fitting.
The long tapered hub provides an important reinforcement for use in several applications involving high pressure, sub-zero and / or elevated temperatures. The smooth transition from flange thickness to pipe or fitting wall thickness effected by the taper is extremely beneficial, under conditions of repeated bending, caused by line expansion or other variable forces.
These flanges are bored to match the inside diameter of the mating pipe or fitting so there will be no restriction of product flow. This prevents turbulence at the joint and reduces erosion. They also provide excellent stress distribution through the tapered hub and are easily radiographed for flaw detection.
This flange type will be welded to a pipe or fitting with a single full penetration, V weld (Buttweld).
Steel Pipe Welding Neck Flange,Rigid Butt Welding Flange,Welding Neck Flange For Pipe,Carbon Steel Flange Customization Fuyuan Marine Accessories Co., Ltd , https://www.fymarineparts.com
On the afternoon of May 20, 2011, seven people including Pan Linbo and Li Xiangbo, deputy heads of Changsha Automobile Factory of Beiqi Foton Motor Co., Ltd., and representatives of Changsha Futian dealers visited Yuchai to inspect Yuchai’s production equipment capabilities and negotiate with Yuchai State. The feasibility of supporting power. Pan Linbo and his entourage and Yuchai Corporation deputy general manager Zhong Yuwei and others held discussions. 
Mr. Zou Yuanguo, deputy manager of Beiqi Foton Motor Co., Ltd. Changsha Automobile Plant Sales Co., Ltd., introduced its production and operations in 2011 and Yuchai’s power coverage. At present, Yuchai Power has basically covered the medium- and heavy-duty trucks, construction vehicles, transport-type construction vehicles and special vehicles of the plant. Faced with the severe situation in the automotive market in 2011, Foton Changsha Automobile Factory hopes that Yuchai will provide support in connection with grid and one-stop services.
In order to meet the requirements of national laws and regulations and provide added value to customers, Zhong Yuwei introduced the Yuchai 4 product technical countermeasures and the national 4 product technical route to Pan Linbo and the two parties reached consensus on the supporting technical route and other contents.