The two sealing faces of the bolt are pressed with each other to form a seal, but at the same time, it also leads to the destruction of the seal. In order to keep the seal, you have to maintain a huge bolt force, to this end, the bolt will do even greater. 

Roll the flange is to put the continuous deformation along the length of the use of open coil system

Electric standard flange on the open and close the valve stem rotation is not only to enhance the operation of the valve stem packing is not easy to damage, sealed and reliable. 

Before the assembly, the valve section must handle the following procedures

Mainly used for welding flange flange and pipe welding counterparts, reasonable structure, strength and stiffness.

Casting flange can only be used in 16Kg, normal conditions used in the 10Kg or 6Kg pipe.

The use of welding scale? Butt welding of high productivity, easy to automate, so has been widely used.

Flange connection (wire connection) flange and welding flange. Low voltage and small diameter is generally wire connecting flange, high pressure and low pressure large diameter are generally used to weld the flange, the thickness of different pressure flange plate and the connecting bolt diameter and the number is different.

Carbon steel flange is relatively strong, can be used in different fields, the method for the production of carbon steel flange for oil and gas pressure PN is equal to or greater than 2.5MPa pipeline, station with insulated steel flange still applies. Simply change the carbon steel flange to the appropriate level of carbon steel flanges, and the methods used are exactly the same.

Low voltage and small diameter of the wire link flange, high pressure and low pressure large diameter are used welding flange is relatively good, can bear different pressure flange thickness and the link bolt diameter and the number is not the same.

American Standard flange is to make pipe and pipe interconnected parts, connected to the pipe end. The holes are American Standard flange bolt, the two flange connect the flange gasket seal.

According to the pressure of different grades and butt welding flange gasket also have different materials, from the low-pressure asbestos pad, high pressure asbestos pad to the metal pads.

Hubbed flange neck low height, stiffness, bearing capacity of flange is improved. Compared with butt welded flange, welding workload is big, electrode consumption is high, the high temperature and high pressure, and repeated bending and temperature fluctuations, but the scene is convenient to install, omitting the weld shoot injury rubbing process, the more popular.

Due to the different specific dimensions represented by the nominal diameter of the container cylinder shaped flange nominal diameter and pipe, so the same nominal diameter of the vessel flange and pipe flange, their size is not the same, not each other alternative.

　　Hebei flange pipe fittings Group Co., Ltd., registered capital of 50.98 million yuan, covers an area of 13.5 million square meters, is located in "China elbow pipe fittings are" the Mengtsun Autonomous County, specializing in the production of flanges, pipe fittings, elbow, tee, fittings, flange gaskets and head, is the domestic production of the flange, pipeline components, series products earlier, one of the manufacturers, companies with quality inspection center, based on the standard of GB/T19001/2000, through the pressure pipe fittings acceptance with the State Administration of quality supervision, inspection and quarantine organization, issued a special equipment manufacturing license.