Vacuum valve flange knowledge summary

1. the live flange

The looper flange is a movable flange. It is usually matched on the water supply and drainage fittings (the most common on the telescopic section). When the factory leaves the factory, there is a flange at each end of the expansion joint, which is directly related to the pipeline and equipment in the project. Connected by bolts.

2. how is the flange connected to the pipe?

There are many types of flanges. Generally used are flat flanges, butt weld flanges (long neck flanges), loop flanges, etc. Flat welding flange is used for medium and low pressure. It adopts plug welding and welding on both sides. The welding depth is 2-5mm from the flange sealing surface. The butt welding flange can be directly butt welded. The loose flange bolt connection does not need welding.

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3. what does the flange type mean?

The flange is a link that connects the valve to the pipe. The connection is made by bolts when the valve is connected to the pipe. Therefore, the N-uniform bolt holes on both ends of the valve are flanged.

1. Flange: Flange is the transliteration of flange, meaning something with flanges, parts, which can be separate, flange or combined, such as one or both ends of the pipe. Flange, there are several through holes on the flange to install the screws. Some bearings have flanges on the outer ring. This flange can be used with or without holes. It is only used for rib positioning.

2. Flange type: The connection between the valve and the pipe or machine equipment is flanged, that is, the connection method is called flange type.

4. what is the flange?

Flanges are disc-shaped parts that are most common in plumbing and flanges are used in pairs. In plumbing, flanges are primarily used for pipe connections. In the pipelines that need to be connected, a variety of flanges are installed, and the low-pressure pipelines can use wire-bonded flanges, and the welding flanges are used at pressures above 4 kg. A sealing point is added between the two flanges and then fastened with bolts. Different pressure flanges have different thicknesses and use different bolts. Pumps and valves, when connected to the pipe, are also made of corresponding flange shapes, also known as flange connections. Connection parts that are closed at the same time by bolting on both planes are generally referred to as "flanges". For example, the connection of ventilation ducts may be referred to as "flange parts". However, this connection is only a part of the equipment, such as the connection between the flange and the water pump, it is not good to call the pump "flange parts". Smaller such as valves, etc., can be called "flange parts".

5. What is the connection method of the flange?

Flange connection is an important connection method for pipeline construction.

Flange connection is to fix two pipes, pipe fittings or equipment on a flange, and between the two flanges, with flange pads, bolted together to complete the connection. Some fittings and equipment have their own flanges and are also flanged.

Flange threaded connection (wire connection) flange and welded flange. Low-pressure small-diameter wire-bonded flanges, high-pressure and low-pressure large diameters are all welded flanges. The thickness of the flanges of different pressures and the diameter and number of connecting bolts are different.

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Depending on the level of pressure, the flange pads are also available in different materials, from low pressure asbestos pads, high pressure asbestos pads to metal pads.

The flange connection is easy to use and can withstand large pressures.

Flange connections are widely used in industrial piping. In the home, the pipe diameter is small and low pressure, and the flange connection is not visible. If you are in a boiler room or production site, there are flanged pipes and equipment everywhere. Flange connection is to fix two pipes, pipe fittings or equipment on a flange, and between the two flanges, with flange pads, bolted together to complete the connection. Some fittings and equipment have their own flanges and are also flanged.

Pay attention to the fact that all bolts are tight when connecting, especially when the bolts are tightened.

6. What is the use of the flange?

The flange is used for positioning.

For example, the cylinder has a mounting method called flange mounting. For example, a rectangular hole is placed around a rectangular parallelepiped. A large hole is in the middle and the outer diameter of the cylinder is the same. The rectangular parallelepiped is placed on the cylinder and the other can be welded. The way is fixed together, the connection between the cylinder and other things is connected by the four holes around the cuboid. This cuboid can be called blue.

7. What is the difference between the connection of the orifice flange and the ordinary flange?

That is, two pipes, pipe fittings or equipment are first fixed on a flange, and between the two flanges, flange mats are fastened together by bolts to complete the connection.

The orifice flange is the orifice plate flow meter connected to the orifice plate (the measuring part of the orifice flowmeter) to the pipe, and the two flanges fix the orifice plate in the middle, and the differential pressure is introduced through the pressure tapping point on the flange. On the transmitter, to measure the flow.

8. In order to ensure that the installed flange does not leak oil, what problems should be paid attention to during installation?

1. The flange should have sufficient strength and should not be deformed when tightened. The flange sealing surface should be clean and clean, and the oil and rust should be carefully cleaned during installation.

2, the gasket should have good oil and aging resistance, as well as better elasticity and mechanical strength.The installation should be based on the shape of the joints with different cross-section and size of the gasket, and placed correctly.

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3, the flange fastening force should be uniform, the compression of the rubber pad should be controlled at 1/3 left.

The butt weld flange is the same as the pipe to be welded at the interface end, and is welded like two pipes.

The flat welding flange is a concave table that is slightly larger than the outer diameter of the pipe at the interface, and the pipe is welded inside.

Butt welding has better welding performance and less corrosion.

Flat welding and butt welding are the welding methods when flanges and pipes are connected. When welding flat welding flanges, only one side welding is required, and the inner joints of welded pipes and flanges are not required. The welding of the welding flanges requires flanges. Face welding. Therefore, the flat welding flange is generally used for low and medium pressure pipelines, and the butt welding flange is used for the connection of medium and high pressure pipelines. The butt welding flange is generally at least PN2.5 MPa. The butt welding is used to reduce stress concentration. The welding flange is mostly a neck flange and also a nipple flange. Therefore, the installation cost of the welding flange, labor costs and auxiliary materials costs are higher, because there is more than one process.

For the welding flange, not all of them need to be welded inside and outside. There is no special requirement. Generally, it is only welded outside. I have not seen the 1/2" butt welding flange:), the flat welding is better. Because the tube and the flange are perpendicular to each other, the tube will not be inclined.

9. the difference between flange and valve?

The valve is the same thing as a faucet, or the faucet is one of the valves. Can be unscrewed, water or gas can flow out; can be closed, the water will not flow.

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The taps in the house are screwed onto the pipe, but some pipes used in the factory, the water or gas inside, the pressure is very high, and the threaded connection is too weak, and it is directly welded or connected by other methods. Flange is one of the connection methods.