Questions and Answers on Basic Knowledge of Flanges

1. What is a loose flange, where is it used and in what fittings?
A flexible flange is a flange that can be moved, usually used to match water supply and drainage fittings (most commonly on expansion joints). When the manufacturer leaves the factory, there is a flange on each end of the expansion joint, which is directly connected to the pipeline and equipment in the project with bolts.
How is the flange connected to the pipeline? Where is it welded?
There are many classifications of flanges. Generally, flat flanges, butt welded flanges (long neck flanges), and loose fitting flanges are used.
Flat welding flanges are used for medium and low voltage applications, using plug welding with welding on both sides. The welding depth is 2-5mm from the flange sealing surface, while butt welding flanges can be directly welded. The bolted connection of the sleeve flange does not require welding.
What does flange type mean?
A flange is a connecting component used to connect valves and pipelines. When a valve is connected to a pipeline, the connection is made by bolts. Therefore, the flange type valve has N evenly distributed bolt holes on both end faces.
Flange: Flange is the transliteration of "flange", which means something or a part with a flange. This type of part can be individual, that is, a flange plate, or a combination type, such as a pipe with a flange at one or both ends. There are several through holes on the flange for installing screws. Some bearings have a flange on the outer ring, which can have holes or not, and is only used for edge positioning.
Flange type: The connection between valves and pipelines or machinery equipment adopts flange connection, which is commonly known as flange type connection.
4. What is a flange?
Flanges are a type of disc-shaped component, most commonly used in pipeline engineering, and are typically paired together.
In pipeline engineering, flanges are mainly used for connecting pipelines. Install a flange plate on the pipeline that needs to be connected. For low-pressure pipelines, threaded flanges can be used, and for pressures above 4 kilograms, welded flanges can be used.
Add sealing points between the two flanges and tighten them with bolts. Flanges with different pressures have different thicknesses and use different bolts. When connecting water pumps and valves to pipelines, the corresponding flange shapes are also made for the parts of these equipment, also known as flange connections.
Any connecting parts that are bolted together in two planes and enclosed at the same time are generally referred to as "flanges", such as the connection of ventilation ducts, which can be called "flange type parts".
However, this connection is only a partial part of a device, such as the connection between a flange and a water pump, so it is not appropriate to call the water pump a "flange type component". Smaller components such as valves can be called "flange parts".