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Brief Introduction of Welding Bellows Industry Application

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Double-sealed design of welded bellows If the bellows fails, the valve stem packing will also avoid leakage and meet international sealing standards; no fluid loss, reducing energy loss, improving plant equipment safety; long service life, reducing maintenance times, and reducing operating costs The rugged and durable bellows seal design guarantees zero leakage of the valve stem and provides maintenance-free conditions; the welded bellows gas medium valve seat adopts PTFE soft sealing material to improve the seal of the valve; the high temperature resistance ≤425 ℃ seat adopts cone The surface is hard-sealed.

Welded corrugated pipe is a kind of highly flexible and flexible metal pipe made of many thin hollow diaphragms formed by stamping and precision welding, as shown in the figure. Its composition method consists of two shaped hollow diaphragms that are welded on the inner edge in a concentric circle to form a diaphragm pair, and a plurality of diaphragm pairs are stacked together and welded on the outer edge to form a corrugated segment. Welding is combined into a corrugated tube group, so that it can reciprocate with other moving parts according to external needs.

With the development of science and technology, the application field of welded bellows is expanding day by day. The main use of welded bellows is as a detection element of a control mechanism, transmitter or regulator. It can also be used as a measurement element of temperature, pressure and liquid level, as well as a variety of seals and energy transmission elements.

In addition to being used as measuring elements, welded bellows can also be used as sealing, connecting, compensating, and isolating elements, which have broad application prospects in many fields.

  1. Instrument industry

Welded bellows are mainly used as pressure measuring elements in measurement and control instruments, and can be used instead of capsule strings. Welded bellows can also be used as a volume compensation element in a gyroscope, as a sealed isolation element in a regulating valve, and as a flexible coupling, pressure switch, etc.

  1. Aerospace field

Welded bellows are also used in the aerospace industry. In addition to being used in some aircraft instruments, welded bellows are also used in parachute automatic release pressure regulators. In addition, it can also be used as a hinged door on a rocket engine.

  1. Electronics industry and other industries

Welded bellows are also used in electronic devices. For example: the klystron of a satellite communication ground station uses a miniature welded corrugated tube with an outer diameter of 10mm, an inner diameter of 5mm, and a wall thickness of 0.05mm. It has also been valued by various users in its use as vacuum seals, axial connectors, expansion joints, oil reservoirs, and accumulators.

The sawtooth expander widely used in the power industry is also a typical application example of welded bellows. Welded bellows actually play a role in volume compensation here. The working coils of voltage transformers and current transformers are immersed in insulating oil tanks. As the ambient temperature and working current change, the temperature of the insulating oil varies widely. Therefore, in a completely closed system, it is necessary to compensate for the volume change caused by the thermal expansion and contraction of the insulating oil.

Welded bellows is a new type of component that has risen at home and abroad in recent years. Welded bellows are generally used as sensitive components, sealing components, isolation media, pipeline connections, and temperature compensators. In addition to the advantages of pressure resistance, temperature resistance, corrosion resistance and good sealing, welded bellows have two outstanding advantages over traditional formed bellows: large amount of deformation and long life.

The choice of welding bellows material is very strict. In addition to high temperature and corrosion resistance, the bellows must have sufficient rigidity. The product welding technologies used or under development include tungsten inert gas shielded welding, micro-beam plasma welding, power beam welding and laser welding, of which micro-beam plasma welding and laser welding are more commonly used.


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