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What Is Metal Bellows Mechanical Seal?

Metal bellows mechanical seal is specialized sealing devices designed to prevent leakage of fluids or gases in rotating equipment, such as pumps, compressors, and mixers. These seals consist of a metal bellows, typically made from high-quality stainless steel, attached to a stationary and a rotating face. The metal bellows provides a flexible, pressure-responsive seal that can accommodate axial and angular misalignment while maintaining a stable sealing interface.

Advantages of Metal Bellows Mechanical Seal

High durability and reliability:
Metal bellows are constructed from durable materials like stainless steel or alloys such as hastelloy and inconel. These materials are resistant to corrosion, wear, and fatigue, which enhances the overall durability and reliability of the seals. This makes them ideal for long-term use in harsh environments.

Wide temperature range:
Metal bellows mechanical seal can operate effectively across a broad temperature range, from cryogenic temperatures to several hundred degrees celsius. This capability is crucial for applications in industries like aerospace, refrigeration, and high-temperature processing.

Resistance to corrosive fluids:
The materials used in metal bellows mechanical seals are typically resistant to a wide range of chemicals and corrosive fluids. This makes them suitable for use in chemical processing, petrochemical industries, and other sectors where aggressive fluids are handled.

No springs to clog or fail:
Unlike traditional mechanical seals that use springs for tension, metal bellows mechanical seal use the elastic properties of the bellows. This design eliminates problems associated with clogging of springs due to solid particles or viscous fluids, and there is no risk of spring failure due to corrosion or metal fatigue.

Compensation for misalignment and end play:
The flexible nature of the bellows allows the seal to compensate for shaft misalignment, end play, and other dynamic movements without losing sealing integrity. This reduces the mechanical stress and wear on both the seal and the machinery.

Low leakage rates:
Metal bellows mechanical seal provide superior sealing performance, which results in very low leakage rates. This is particularly important in applications involving hazardous or expensive materials where containment is critical.

Minimal maintenance required:
Because of their robust construction and the absence of components like springs that require regular maintenance, metal bellows mechanical seal generally require less upkeep. This lowers maintenance costs and reduces downtime in industrial processes.

Versatility:
They can be designed and customized to meet specific requirements of different applications, such as varying pressures, fluid types, and environmental conditions, adding to their versatility across industries.

Welded Metal Bellows
Welded metal bellows are mechanical devices designed to provide a flexible, leak-tight seal for various engineering applications.
Metal Bellows Seal
Single face. Balanced type. Arbitrary rotation. According with EN12756 (DIN24960) standard. KBF series is widely used, the dynamic ring O ring can not compensate for the role, so bellows movement
Bellow Mechanical
Single face. Balanced type. Arbitrary rotation. According with EN12756 (DIN24960) standard. KBWT80 series is widely used, suitable for high temperature, high viscosity medium, so bellows movement
Metal Bellow Seal
Comply with DIN24960 and GB6556. Metal bellows. O type sealing ring. Easy installation, easy adjustment. Corrosion resistant seal
Welded Metal Bellows
Design characteristics of corrugated pipe by using 45 wave of advanced, medium pressure on the inner hole weld mushroom stress decreases to a minimum, the auxiliary seal ring is made of flexible
Bellow Type Mechanical Seal
K604 type: high temperature general purpose metal bellows, used for large shaft diameter and high speed condition and the sealed cavity is not standard big diameter.
Elastomer Bellow Seals
K609 type: high temperature rotating bellows, its narrow cross-section design makes installation easier.
Bellow Seals
K606 type: high temperature rotating bellows, relying on the bellows under the fork drive, applied to the viscosity and easy crystallization conditions.
Bellows Mechanical
Single face. Balanced type. Arbitrary rotation. According with EN12756 (DIN24960) standard. KBF series is widely used, the dynamic ring O ring can not compensate for the role, so bellows movement
Metal Flex Welded Bellows
Design characteristics of corrugated pipe by using 45 wave of advanced, medium pressure on the inner hole weld mushroom stress decreases to a minimum, the auxiliary seal ring is made of flexible

Why Choose Us

Our factory
Gaodao Sealing Technology (Suzhou) Co., Ltd. was established in 2021 with a registered capital of 12 million yuan. It is a member unit of the China General Machinery Industry Association and has been successfully selected as one of the first batch of innovative and entrepreneurial leading talent enterprises in Gusu in 2022.

Advanced equipment
Our company has domestically advanced production, manufacturing and testing equipment, as well as professional technical personnel.

High quality
The company adopts an ERP management system, using scientific methods and data analysis to provide customers with high-quality products and stable delivery cycles.

Production market
In 2023, our company's total marketing revenue was 39.5 million yuan, providing strong support for the needs of major host factories, equipment factories, and end users nationwide.

24H online service
We try and respond to all concerns within 24 hours and our teams are always at your disposal in case of any emergencies.

Types of Metal Bellows Mechanical Seal

Metal bellows seals
These seals are known for their high durability, resistance to extreme temperatures, and resistance to corrosive substances, making them suitable for demanding industrial applications.

Elastomeric bellows seals
Elastomeric bellows seals are widely used in applications where flexibility and cost-effectiveness are crucial. Made from a variety of elastomeric materials, these seals offer excellent sealing capabilities under moderate temperature and pressure conditions. They are typically used in commercial and residential applications where the requirements for operation are not as stringent as in industrial environments.

PTFE bellows seals
PTFE, or polytetrafluoroethylene, has excellent chemical resistance and can operate effectively over a wide temperature range. These seals are particularly useful in applications involving highly corrosive substances, such as chemical processing and pharmaceutical manufacturing. Although PTFE bellows seals are more expensive than elastomeric seals, their unique properties make them indispensable in specific industrial applications.

Application of Metal Bellows Mechanical Seal

Pumps: Metal bellows mechanical seals are commonly used in centrifugal pumps, positive displacement pumps, and cryogenic pumps to prevent leakage of liquids or gases.

Compressors: In compressor applications, metal bellows mechanical seals are used to seal high-pressure gases and prevent contamination of the compressed media.

Mixers and agitators: Metal bellows mechanical seals are employed in mixing and agitation equipment to contain process fluids and prevent shaft leakage.

Refineries and petrochemical plants: In the oil and gas industry, metal bellows mechanical seals are used in pumps, compressors, and other rotating equipment to handle hydrocarbons, solvents, and other aggressive fluids.

Chemical processing: Metal bellows mechanical seals are utilized in chemical manufacturing plants to seal pumps and other equipment handling corrosive or toxic chemicals.

Power generation: In power plants, metal bellows mechanical seals are used in boiler feed pumps, circulating water pumps, and other critical equipment to ensure reliable operation and prevent leakage.

Pharmaceutical and food processing: Metal bellows mechanical seals are employed in hygienic and aseptic applications to maintain product purity and prevent contamination.

Components of Metal Bellows Mechanical Seal

Metal bellows
The centerpiece of the metal bellows mechanical seal is the metal bellows itself. It is a precisely engineered flexible component responsible for accommodating axial, lateral, and angular movements while maintaining the seal. These bellows are typically made from stainless steel, which offers excellent resistance to corrosion and high-temperature environments.

Gaskets and o-rings
To ensure a tight and leak-free seal, gaskets and o-rings are used in metal bellows mechanical seal. These components are made from elastomers or other suitable materials and are designed to withstand the operating conditions, such as temperature, pressure, and the fluid being sealed.

Stationary and rotating faces

The stationary face is the part of the seal that remains fixed while the rotating face rotates with the equipment. These faces are typically made from materials with high wear resistance, such as carbon, ceramic, or silicon carbide. The choice of material depends on the specific application and the fluids being sealed.

Springs and drive mechanism

Metal bellows mechanical seal incorporate springs and drive mechanisms to maintain the necessary force between the faces for effective sealing. The springs provide the required axial force to keep the faces in contact, ensuring a reliable seal under varying conditions. The drive mechanisms, such as set screws or drive pins, transmit the torque from the rotating equipment to the rotating face of the seal.

Secondary sealing elements

To enhance the overall sealing performance, metal bellows mechanical seal often include secondary sealing elements. These elements, such as v-rings or elastomeric boots, offer an additional level of protection against leakage and external contaminants. They provide an extra barrier that complements the primary sealing mechanism.

How to Maintain Metal Bellows Mechanical Seal

To ensure the optimal performance and longevity of metal bellows mechanical seal, proper maintenance and periodic inspections are essential. Here are some key maintenance practices and troubleshooting tips:

Regular inspections: Regularly inspect the seal faces for signs of wear, corrosion, or damage. Use appropriate measuring tools to check the seal face flatness and runout. Inspect the bellows for fatigue cracks, signs of deformation, or corrosion.

Lubrication: Follow the manufacturer's guidelines on lubrication requirements. Proper lubrication reduces friction, extends seal life, and improves overall seal performance.

Cooling and flushing: In applications where high temperatures or abrasive particulates are present, consider implementing cooling or flushing systems to protect the seal and prevent premature failure.

Environmental control: Ensure that the operating environment meets the recommended temperature, pressure, and humidity conditions specified by the seal manufacturer. Extreme variations in temperature or pressure can affect the seal's performance.

Address leakage promptly: If leakage occurs, inspect the seal faces for damages or misalignment. Adjust the seal face pressure or replace worn-out components as necessary.

How to Choose a Metal Bellows Mechanical Seal

Plate shape
The shape of the metal plates used in the bellows can significantly impact the seal’s flexibility and durability. Flat plates offer simplicity but May be more prone to fatigue, while formed plates can provide enhanced flexibility and stress distribution.

Angle
The angle at which the metal plates are welded together affects the bellow’s ability to compress and expand. A larger angle allows for greater compression but May reduce the seal’s stability. Conversely, a smaller angle provides increased stability but limits the compression range.

Weld integrity
Poor weld quality can lead to leaks, corrosion, and premature failure. Ensure that the metal bellows mechanical seal you choose have high-quality, consistent welds that can withstand the demands of your application.

Plate thickness (thin plates)
Thin metal plates offer the advantage of increased flexibility, allowing the bellows to compress and expand more easily. However, thinner plates May be more susceptible to damage and wear.

Controlling vibrations
Vibrations can cause significant stress on metal bellows mechanical seal, leading to fatigue and failure. Implementing vibration control measures, such as using dampening materials or designing the seal with vibration-resistant features, can help prolong the seal’s life and maintain its performance in high-vibration environments.

Double-ply bellows
For applications requiring enhanced strength and durability, double-ply bellows can be an excellent choice. These bellows feature two layers of metal plates, providing increased resistance to pressure and temperature fluctuations. Double-ply bellows are particularly well-suited for high-pressure or high-temperature applications where single-ply bellows May not suffice.

Pressure and seal balance
Achieving the proper balance between pressure and seal performance is critical for the success of metal bellows mechanical seal. Over-pressurization can cause the bellows to deform or fail, while under-pressurization May result in leaks.

Our Factory

Gaodao Sealing Technology (Suzhou) Co., Ltd. was established in 2021 with a registered capital of 12 million yuan. It is a member unit of the China General Machinery Industry Association and has been successfully selected as one of the first batch of innovative and entrepreneurial leading talent enterprises in Gusu in 2022.
The company currently has nearly 70 employees, including 12 technical engineers and 5 university and industry consultants. The company adopts an ERP management system, using scientific methods and data analysis to provide customers with high-quality products and stable delivery cycles. Having advanced domestic production, manufacturing, testing equipment, and professional technical personnel.

FAQ

Q: Why use a mechanical seal?

A: Improved Safety: Mechanical seals provide a high level of safety by preventing leaks and spills. They can handle high-pressure and high-temperature environments, ensuring that fluids are contained within the equipment. This reduces the risk of accidents, environmental damage and equipment failure.

Q: What is the function of bellow seal?

A: Bellows seal valves are valves employed in piping systems to safeguard against leakage. When selected and installed properly, they minimize the risk of potentially harmful chemicals causing injury or illness to workers and damage to the surrounding environment.

Q: What are the applications of mechanical seals?

A: Mechanical seals are utilised in a variety of sectors, including the automotive, food and beverage, aerospace, industrial, residential, printing and publishing, and marine sectors.

Q: What is the most commonly used mechanical seal?

A: The most common type of mechanical seal used in various industries is the single mechanical seal. Single mechanical seals are widely employed in pumps, mixers, and other rotating equipment to prevent leakage of fluids (such as water, oil, or chemicals) between the rotating shaft and the stationary housing.

Q: What is the difference between pusher and bellows seal?

A: Pusher type seals are used more commonly in low S.G. (<0.7) services. In a bellows seal, the secondary sealing element (bellows) generally has a larger diameter than a pusher seal, therefore the closing area is less.

Q: How does a bellows seal work?

A: Bellows seal valves incorporate a cylindrical metal tube that expands and contracts like an accordion to create a hermetically sealed closure in a valve stem. The bellows get compressed when the valve is in the open position and expands when the valve is closed.

Q: What are the benefits of mechanical seals?

Q: What is the difference between pusher and bellow seals?

A: Mechanical seals are typically categorized into two major types; pusher and non-pusher. A non-pusher type seal consists of a bellows assembly. The bellows is a component that acts as both the load element (like a spring in a pusher type) and a secondary sealing element like an 'O' ring in a pusher type).

Q: Where do we use mechanical seal?

A: Mechanical seals are used in almost all types of pumps. From garden pumps to pumps in refineries, in the gas industry as well as in dairies, breweries, in the beverage or food industry and even in nuclear power plants. Mechanical seals for agitators are usually custom-made.

Q: Why need a mechanical seal?

A: Mechanical seals help prevent pump leaks and outside contamination from entering the water flow during potable water processing. They keep rotating equipment, large and small, running dependably and effectively.

Q: Do mechanical seals need lubrication?

A: Mechanical Seals Need Lubrication and Parallel Faces.A mechanical seal is mysterious to most users, but its design is very simple.

Q: What is the most common cause of mechanical seal failure?

A: The most common cause is dry running, where the pump operates without adequate lubrication. Dry running generates excessive heat and accelerates seal degradation. Other significant causes include improper installation and alignment issues.

Q: Do mechanical seals need cooling?

A: Many pumping arrangements, including those with packing seals and mechanical seals, rely on seal water for effective operation. Seal water serves three main purposes: to cool the seal and the shaft, to lubricate the seal and to flush away impurities in the system.

Q: What are the four major elements of a mechanical seal?

A: Short Answer The essential elements of a mechanical face seal involve four main parts: a primary ring, a mating ring, a spring component, secondary sealing elements, and the seal housing. Each of these parts cooperates and interacts to form a high-performing mechanical seal system.

Q: How to lubricate a mechanical seal?

A: The lubrication can be from the pumped medium if it is compatible with the seal components, or it can be grease lubricated.

Q: What keeps the two faces of a mechanical seal together?

A: The seal faces are pushed together using a combination of hydraulic force from the sealed fluid and spring force from the seal design. In this way, a seal is formed to prevent process leaking between the rotating (shaft) and stationary areas of the pump.

Q: What is the function of O ring in mechanical seal?

A: The main purpose of O-rings is to prevent fluid or air from escaping as it acts as a sealing device. When the ring is squeezed between two surfaces, it takes up the clearance and then prevents any fluid or air from being released.

Q: What is the flatness of a mechanical seal?

A: A typical seal face is flat to within 23 millionths of an inch. This degree of flatness is so small that refracted light rays must be used to measure it. The fluid film is established during initial start-up of the seal by hydraulic forces. The principle of establishing a fluid film is essential to all seal designs.

Q: What is the gap between the faces of a mechanical seal?

A: The reality is there is a small gap formed between the seal faces in which fluid under pressure and temperature will act to cool and lubricate the face pair. In aqueous fluid, this gap can be as small as 0.3 micrometers (µm).

Q: Why do mechanical seals break?

A: The mechanical seal can fail due to tiny amounts of dirt getting on the seal face, or even oil from your fingerprints. These tiny particles or grease can create wear or destroy the seal face itself, which results in leakage.

We're professional metal bellows mechanical seal manufacturers and suppliers in China, specialized in providing high quality customized service. We warmly welcome you to wholesale bulk metal bellows mechanical seal made in China here from our factory.

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