Advantages and manufacturing standards of metal bellows

As a kind of elastic sealing element, metal bellows has a wide range of applications in valve manufacturing, such as bellows gate valves and bellows globe valves. The bellows structure converts the dynamic seal of the valve stem at the stuffing box into a static seal of the valve stem at the valve cover, which makes the sealing of the valve safer and more reliable. However, since the metal bellows can only withstand stretching and compression, and cannot withstand the torque, the current application is limited to gate valves, globe valves, safety valves, etc., where the valve stem moves only for axial lifting without radial rotation. .

First, the classification and application of metal bellows

Metal corrugated hoses are a high quality flexible connecting tube in modern industrial piping. It is mainly composed of metal bellows, metal mesh and various types of joints. The inner tube is a thin-walled stainless steel corrugated tube with spiral corrugation or annular corrugation. The outer sleeve of the corrugated tube is woven by stainless steel wire or stainless steel strip according to certain parameters. The joints at the ends of the hose are formulated according to the joint form of the user's piping or equipment.

Types of bellows: Bellows are mainly divided into metal (stainless steel, carbon steel) bellows and plastic bellows. Metal bellows is mainly used to compensate for the thermal deformation, shock absorption and absorption line deformation of pipelines. It is widely used in petrochemical, instrumentation, aerospace, chemical, electric power, cement, metallurgy and other industries. Other materials such as tanning materials have an irreplaceable role in media transportation, power threading, machine tools, and home appliances. Metal bellows are used for pipes with heat expansion and contraction.

Metal bellows use range: It is suitable for heat-dissipating oil, toxic, flammable, highly permeable, polluting environment, radioactive fluid medium pipeline as a shut-off valve, and can also be used for adjustment. It is a high-quality product that creates a leak-free factory.

Second, the advantages of metal bellows:

1. Double seal design (corrugated pipe + packing) If the bellows fails, the stem packing will also avoid leakage and meet the international sealing standards.

2, safety and environmental protection, no fluid loss, reduce energy losses, improve plant equipment safety.

3, long service life, reduce the number of maintenance, reduce operating costs.

4. Rugged bellows seal design ensures zero leakage of the valve stem and provides maintenance-free conditions.

Third, metal bellows manufacturing standards

The metal bellows adopts gb/t12777-91 metal bellows with gb/t12777-91, and with reference to the American "ejma" standard, optimized design, reasonable structure, stable performance, high strength, good elasticity, high fatigue resistance, etc. 1cr18ni9ti, ocr19ni9 austenitic stainless steel, with low carbon steel or low alloy steel at both ends.

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