Welding flange is not easy to deform, good sealing, wide application, have the corresponding rigidity and elasticity requirements and reasonable welding thinning transition, the welded seam is joint distance, joint from welding temperature deformation, it adopts a more complex structure of the mouthwash, suitable for pressure or temperature fluctuations in the pipeline or high temperature,

With the rapid development of our company, we have attracted a lot of foreign customers. This week, one of our Italy customer visited our factory. He had a great interest on our carbon steel flanges and forged flanges. We showed him around our factory and took him to our workshop for further introduction our products.

In order of further regulating our operation process, and controlling the quality of our products more efficiently, LFDY started the audition of production processing, raw material controlling, quality test controlling, audition of Mill test Report. Etc according to PED (2014/68/EU) AD2000 W0 in year of 2018. After very strict verification, LFDY passed the audition hold

Today one of our South America customer came to our factory. The have a great interest on our carbon steel seamless pipe and  carbon steel bw fittting. We showed them around our factory and introduced our products. Perfect day!

Elbow is divided into cold stamping and hot stamping two kinds, according to the material properties and equipment capabilities to choose hot and cold stamping, cold stamping elbow is the use of a dedicated elbow forming machine, and then put the tube billet in the external mold, the upper and lower mold after the push

Test method for clearance and rotational flexibility of pipe fittings The measurement of the radial clearance of the whole tube is not easy, the measuring force causes the ring and the rolling body and the contact place to produce the elastic deformation, the deformation amount is the many factors that cause the measurement error, it

Weld neck flange problem Today, a friend consulted: after welding neck flange welding, found that the internal welding slag and Burr can be cleaned? Pipe and flange material is 316L, welding all used argon arc welding, after welding not only burr exists, there is no penetration of the situation, why so? Is the welder level

Type and function of flange gasket Commonly used flange gaskets are divided into three main categories: 1. Non-Metallic gasket A, Asbestos rubber gasket Features: Good elasticity, high strength, good oil resistance, high temperature resistance, easy access. But asbestos products can cause cancer. Scope of application: T≦260℃, pn≦2.0mpa (SH3401), T≦400℃, pn≦4.0MPa (gb/t539), used in water, air,

Plate slip on flange (chemical standard HG20592, national standards gb/t9119, Machinery jb/t81): Easy to draw, simple to manufacture, low cost, wide use, but the rigidity is not good, so it can not be used for supply and demand, flammable, explosive and higher vacuum requirements of the chemical process piping system and high, extremely hazardous occasions. The

Stainless steel slip on flange is convenient, simple to manufacture, low in cost and widely used, but the rigidity is poor, so it can not be used in the chemical process piping system with the requirement of supply and demand, flammable, explosive and high vacuum degree, and high and extreme harm. The sealing type has