Bellows Fittings

A cylindrical thin-walled wrinkled shell with multiple transverse corrugations, where the corrugated tube is elastic and can produce displacement under pressure, axial force, transverse force, or bending moment. Bellows are widely used in instruments and meters, mainly as measuring elements for pressure measuring instruments, converting pressure into displacement or force. The corrugated pipe has a thin wall and high sensitivity, with a measurement range of tens of pascals to tens of megapascals. In addition, corrugated pipes can also be used as sealing isolation components to separate the two media or prevent harmful fluids from entering the measuring part of the equipment. It can also be used as a compensation element to compensate for temperature errors in instruments by utilizing its volume variability. Sometimes it is also used as an elastic connection joint between two parts. Bellows can be divided into two types based on their constituent materials: metal bellows and non-metallic bellows; It can be divided into single-layer and multi-layer according to structure. Single layer corrugated pipes are widely used. Multilayer corrugated pipes have high strength, good durability, and low stress, and are used in important measurements. The materials of corrugated pipes are generally bronze, brass, stainless steel, Monel alloy, and Inconel alloy.

Company Profile

We independently develop, design and produce various specifications and models of metal bellows, semiconductor equipment accessories, vacuum and ultra-vacuum equipment accessories, etc. We have modern clean workshops, complete production facilities and perfect technology, and have dozens of special production equipment for bellows welding, CNC machining centers, imported precision punching machines, and imported high-sensitivity leak detection equipment.

Industry Applications

The welded bellows produced by our company are widely used in vacuum equipment, chemical engineering, vacuum sealing, flexible connection, pressure sensing, stiffness compensation, biopharmaceuticals, electronic engineering, petrochemicals, mining and smelting, aerospace and other industrial fields.

FAQ

1、How to choose the material for vacuum welding bellows?

The selection of vacuum welding bellows materials should be based on multiple factors, mainly including the following points:
Corrosion resistance: Since the vacuum environment has high requirements for the purity of the material, the selected material should have good corrosion resistance to ensure that it is not corroded by the medium or environment during long-term use.
Strength and toughness: Vacuum welding bellows need to withstand certain pressure and displacement, so the material must have sufficient strength and toughness to ensure the stability and reliability of the bellows.
Weldability: The material should be easy to weld and ensure the quality of the welded joint to avoid defects such as cracks and pores.
Purity: The purity of the material is also one of the important factors in selection. High-purity materials help reduce the influence of impurities during welding and improve welding quality.
Applicable temperature range: According to the temperature requirements of the specific application scenario, select materials that can work stably within this temperature range.
Taking the above factors into consideration, stainless steel (such as 304, 316L, etc.) and titanium alloys are commonly used vacuum welding bellows materials. These materials not only have good corrosion resistance and strength, but are also easy to process and weld, and can meet the use requirements in most vacuum environments. When choosing, further evaluation and selection are required based on specific application scenarios and needs.

2、Can elastic components withstand high temperature and high pressure environments?

Whether bellows fittings can withstand high temperature and high pressure environments depends on their specific materials, designs, and application scenarios.
Some bellows fittings, such as wire braided springs and specific metal seals, can withstand high temperature and high pressure environments to a certain extent. However, their tolerance is limited, especially under extreme high temperature and high pressure conditions, the resilience may drop sharply or even be completely lost. In addition, the stability of bellows fittings at high temperatures is also affected by the materials of their outer heat protection and wear-resistant layers.
For equipment that needs to work in extreme high temperature and high pressure environments, bellows fittings designed for these conditions should be selected to ensure that they have sufficient resilience, sealing, and stability. At the same time, factors such as the corrosion resistance and service life of the bellows fittings need to be considered to ensure the long-term reliable operation of the equipment.
In general, although some bellows fittings can withstand high temperature and high pressure environments to a certain extent, they need to be carefully evaluated and tested according to specific conditions when selected and used.

3、What temperature environments are alloy bellows suitable for?

The temperature environment applicable to alloy bellows varies due to its material properties and design. Generally speaking, alloy bellows can be applied to a wide temperature range, but the specific applicable temperature needs to be determined according to the alloy material used for the bellows. For example, some alloy bellows may be able to work stably in an environment as low as tens of degrees below zero, and at the same time, there are alloy bellows that can withstand high temperature environments up to hundreds of degrees.
In particular, Hastelloy bellows are often used to handle high temperature, high pressure and highly corrosive media such as steam, high temperature liquids and a variety of corrosive media due to their excellent corrosion resistance and high temperature stability. However, when the operating temperature exceeds the limit of the material, additional insulation measures may be required or alloy materials with higher temperature tolerance may be selected.
In summary, alloy bellows are suitable for a wide range of temperature environments, but the specific temperature range needs to be determined according to material properties and application scenarios.