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Shanghai Gaochuan Valve Manufacturing Co., Ltd.

Address: No. 2465, Hengcang Road, Malu Town, Jiading District, Shanghai

Phone 1: 021-56772777 

Phone 2: 021-56521514 

Phone 3:021-56521504

Fax: 021-56770777

QQ: 49453698

E-MAIL: gcvalve@126.com


Several common types of metal sealing flanges for vacuum pipe fittings

2021-04-20 01:40:11

In some very high vacuum equipment that requires high temperature baking (a baking environment greater than 200ºC) or low vapor pressure ( vacuum equipment less than 10°C at room temperature ), metal sealing materials are not resistant to high temperatures and have a large amount of outgassing. , Not suitable for use in this environment.

The following are some types of metal sealing flanges .

Linear seal.

The square seal means that there is a gap of 0.025mm on the seal step, which can ensure that the seal ring is in an "L" shape when it is compressed and deformed. For the lower flange step, it is necessary to facilitate the positioning of the O-ring, and the surface roughness is required to be 1.6 better than that of the R-ring, and the O-ring compression is 50%. The commonly used O-ring wire diameters are: 0.5mm, 0.6mm, 0.8mm, 1mm and 1.5mm.

Tapered face seal

The sealing of the end face of the cone requires that the surface of the seal has a roughness better than R1.6, and the angles of the upper and lower cones should be consistent to ensure the reliability of the seal. The commonly used sealing ring materials are aluminum, nickel, copper, stainless steel flanges and other stainless steel. The material of the sealing flange is generally carbon steel or stainless steel.

Flat flange seal

The flat flange seal is the simpler form of the metal seal flange types listed here. The sealing surface does not need to be matched, and the surface roughness requirement is R=1.6-R=0.25, which is relatively easy to achieve. Commonly used materials for ordinary flange seals are gold, copper, and aluminum.

The main disadvantage of this kind of flange seal is that the positioning of the sealing ring is difficult, and its contact surface is large, and the sealing force is required to be high. Therefore, it is often used in the sealing of small diameter flange connections.

Wheeler Seal

The blade width is equal to the diameter of the seal ring, both are 2mm, and the seal ring material is made of oxygen-free high-conductivity copper. The gasket is plastically deformed due to pressure, thereby filling the space on the left and squeezing the excess part out from the right to form a reliable sealing environment. Polytetrafluoroethylene can also be used as a sealing material.

In vacuum equipment, metal seal is an important sealing material. It has very low outgassing and can withstand continuous high-temperature baking environment. Therefore, it becomes an indispensable part of vacuum equipment. It is used in very high vacuum coating. There are a wide range of applications in the equipment.




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 Address: No. 2465, Hengcang Road, Malu Town, Jiading District, Shanghai

Phone: 021-56772777 56521514 56521504

 Fax:021-56770777          QQ:49453698