To enhance quality control, We has approved by quality system ISO 9001 High Efficient Team, Worldwide Reputation, Quick Deliveries

What are the Ways of Flange Connection?Alloy flanges supplier,stainless steel flanges price list,slip on flange,weld neck flanges,socket weld flange,blind flange,lap joint flange,Thread flanges,Screwed Flange

To enhance quality control, We has approved by quality system ISO 9001 High Efficient Team, Worldwide Reputation, Quick Deliveries

What are the Ways of Flange Connection?Alloy flanges supplier,stainless steel flanges price list

What are the Ways of Flange Connection?

Date:2022-10-26Tags:What are the Ways of Flange Connection?Alloy flanges supplier,stainless steel flanges price list,slip on flange,weld neck flanges,socket weld flange,blind flange,lap joint flange,Thread flanges,Screwed Flange

Flange connection is an important connection method for pipeline construction. Flange connection is to fix two pipes, fittings or equipment on a flange, and add flange gasket between the two flanges and fasten them together with bolts. Some pipe fittings and equipment with their own flange, also belongs to the flange connection. Flange is divided into threaded connection flange and welding flange.


Flange connection is generally divided into: flat welding, butt welding, socket welding, loose-fitting, threaded

1. Flat welding: only with welding the outer layer, without welding the inner layer; generally used in medium and low pressure pipelines, the nominal pressure of the pipeline to be less than 2.5MPa. flat welding flange sealing surface there are three, respectively, smooth, concave and convex and tongue and groove type, which is smooth application. For a wide range, and affordable, cost-effective.

2. Butt welding: the inner and outer layers of the flange should be welded, generally used in medium and high pressure pipelines, the nominal pressure of the pipeline between 0.25 ~ 2.5MPa. The sealing surface of the butt-welding flange connection is concave and convex, and the installation is more complicated, so the labor cost, installation method and the cost of auxiliary materials are relatively high.

3. Socket weld: generally used in pipelines with nominal pressure less than or equal to 10.0MPa and nominal diameter less than or equal to 40mm.

4. Loose sleeve: generally used for pressure is not high but the medium is more corrosive pipeline, so this type of flange corrosion resistance, material more stainless steel-based.

This connection is mainly used for the connection of cast iron pipes, rubber-lined pipes, non-ferrous metal pipes and flange valves, etc. The connection of process equipment and flanges are also flange connections.

The flange type has a flange at each end of the sphere of the rubber joint. Fixed flange type is the flange and the reinforcing cord fabric inside the rubber sphere through the large flange sealing surface plus sulfur bonding, the two ends can not be rotated. When cooperating with pipeline, sometimes the direction of bolt hole is misaligned and cannot be used. Loose sleeve flange type is through the rubber sphere inside the reinforcing cloth wrapped end wire ring card in the flange of the slot, while playing the role of sealing and connection, both sides of the flange can be rotated


Flange connection is an important connection method for pipeline construction.

Flange type, according to the flange and the pipe fixed way is divided into threaded flange, welding flange, loose flange; according to the form of sealing surface, can be divided into smooth, concave and convex, tongue and groove, lenticular and trapezoidal groove type.

General low pressure small diameter with wire flange, high pressure and low pressure large diameter with welding flange, the thickness of the flange and the diameter and number of connecting bolts are different for different pressures.

According to the different levels of pressure, flange gaskets also have different materials, from low-pressure asbestos gaskets, high-pressure asbestos gaskets and teflon gaskets to metal gaskets are available.

Flange connections are easy to use and can withstand large pressures.

In industrial pipelines, flange connections are widely used, for example, in indoor fire hydrant water supply systems, butterfly valves, gate valves, check valves and other types of valves and pipeline connections

The connection form of butt-welding flange

Flange is a component used to link the valve and pipe, and a variety of flange types, flange connection is also a variety of ways, and butt welding flange is only a class of flange connection, butt welding flange connection is more troublesome, so it is used for some welding difficult flange, butt welding flange installation process is more cumbersome, and the use of more labor, the use of auxiliary materials are also more More, butt-welding flange connection is complex, then let's understand it.


1. Smooth: stainless steel valves for pressure is not high. Processing is more convenient.

2. Convex: higher working pressure, can use hard gaskets.

3. Tongue and groove type: available plastic deformation of the gasket, more widely used in corrosive media, the sealing effect is better.

4. Trapezoidal groove type: oval metal ring for gasket, used in the working pressure ≥ 64 kg / cm2 valve, or high temperature valve.

5. Lens type: gasket is lens-shaped, made of metal. Used for working pressure ≥ 100 kg / cm2 of high-pressure valves, or high-temperature valves.

6. O-ring type: This is a newer form of butt-weld flange connection, which was developed with the emergence of various rubber O-rings.



Hunan Jetvision Industrial Co.Ltd provide kinds of flanges with high quality and low factory price, such as slip on flange, weld neck flanges, socket weld flange, blind flange, lap joint flange, Thread/Screwed Flange, etc.

Hunan Jetvision Industrial Co.,Ltd main provide alloy, stainless steel and copper nickel alloy material, such as incoloy 800, hastelloy c276, monel 400, inconel 625, 15CrMo alloy, copper c71500, s32205 duplex stainless steel, 15-5PH stainless steel 904L stainless steel, etc. On the basis of this, we provide kinds of products, including forgings rings, forged shaft, forgings flanges, forged bars, forging block, forged cylinder, etc. With low factory price and top quality.