Welding neck flange is USED FOR welding flange and pipe, its structure is reasonable, strength and stiffness is large, withstand high temperature and high pressure and repeated bending and temperature fluctuation, reliable sealing. For butt welding flanges with nominal pressure of 0.25 ~ 2.5mpa, the lateral slope of neck of butt welding flanges with concave and convex sealing face shall not be more than 7 degrees.

The technical parameters of butt welding neck flange are strictly controlled during production and welding to ensure that it can play a full role and value in production and use. Butt welding neck flange is not easy to deformation, good sealing, wide application, have corresponding rigid and elastic demand and reasonable butt thinning transition, joint good distance away from the joint face the faying surface from welding deformation temperature, it take more complex syndromes beep form structure, suitable for pressure or temperature fluctuations of pipeline or high temperature, high pressure and low temperature pipes, Generally used for PN greater than 2.5mpa pipe and valve connection; It is also used for conveying expensive, flammable and explosive media on the pipeline.

Stainless steel welding neck flange ball valve connection:

1, first of all, stainless steel butt welding neck flange ball valve body has a flange, according to a certain standard drill has a standard eye distance hole, pipe joint end is also welded with the same standard flange piece, bolts make stainless steel ball valve flange and pipe flange;

2, welding neck flange according to the requirements of the working conditions with gasket seal. The gasket is placed between the sealing surface of the two flanges. After tightening the nut, the specific pressure on the surface of the gasket will be deformed when it reaches a certain value, and the uneven parts on the sealing surface will be filled, so that the connection is tight without leakage.

3. Butt welding neck flange connection is a detachable connection. There are three types of flange sealing face: flat sealing face, suitable for low pressure, medium non-toxic occasions; Concave and convex sealing surface, suitable for slightly high pressure occasions; Tenon and groove sealing surface, suitable for flammable, explosive, toxic media and high pressure occasions. Flange surface variation also requires the stainless steel valve body to bear the characteristics of the corresponding operating conditions.