In the pump industry, sealing performance directly affects equipment operating efficiency and reliability. Choosing the appropriate sealing method is not only a technical issue but also relates to cost and safety. Common types of seals mainly include the following categories:

Packing seals, as a traditional form, are divided into soft packing and hard packing. Soft packing, such as graphite, aramid, or PTFE braided packing, relies on gland compression to achieve sealing. It has a simple structure but requires regular maintenance and is suitable for medium-low pressure and non-highly corrosive environments. Hard packing, such as metal open rings and split rings, is often used in high-pressure, high-speed reciprocating or rotating machinery. It is wear-resistant but complex to manufacture.

(Single-face water-cooled seal)  

Mechanical seals operate through the conform of rotating and stationary ring end faces, representing a relatively mainstream technology. They feature a compact structure, low leakage, and long service life, making them widely used in rotor pumps, chemical pumps, and other applications. However, they require high installation precision and medium cleanliness, and their cost is higher than that of ordinary packing seals.

(Double-face water-cooled seal)  

Oil seals are a type of lip seal that relies on self-tightening force to seal the shaft. They are lightweight, easy to install and remove, and can prevent oil leakage and dust ingress. They are commonly found in low-pressure lubrication systems or small pumps but are not suitable for high-pressure or corrosive media.

Dynamic sealing is a relatively special design, such as auxiliary impeller sealing, which achieves sealing effect through fluid pressure during pump operation. When stopped, other sealing means must be used to address potential leakage. This method has no mechanical wear, a long service life, and is particularly suitable for conveying media containing particles, but its structure is relatively complex.

Spiral sealing, another form of dynamic sealing, uses the pumping action of spiral grooves machined on the rotating shaft or its sleeve to prevent leakage of the sealing fluid. As a non-contact type, it has no friction and a long service life, often used for low- or medium-speed shaft seals. However, its sealing capability is significantly affected by rotational speed—effective at high speeds but prone to leakage at low speeds—thus limiting its application range.

In addition, dry gas seals and labyrinth seals, though more common in compressors, are also used in some high-pressure centrifugal pumps. They rely on gas flow obstruction or complex flow paths to achieve sealing, representing high-performance non-contact solutions. However, they have high manufacturing barriers and are expensive.

(Bellows seal)  

In summary, the selection of sealing rings for pumps requires comprehensive consideration of multiple factors such as medium characteristics, pressure, rotational speed, and operating environment. There is no "universal" sealing method—only rational selection based on specific working conditions. With future advancements in materials and structural technologies, more efficient and durable sealing forms will continue to drive the pump industry toward emphasizing both energy savings and reliability.

Bonve always adheres to the philosophy of "Wholeheartedly Making Good Rotor Pumps," committed to providing global customers with customized conveying and mixing solutions. If you have technical inquiries, selection needs, case references, or other cooperation intentions related to Bonve rotor pumps, please feel free to contact us.  

Service Hotline: 0574-87588986 13586591794  

Official Website: www.bvpumps.com  

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We look forward to working with you to drive efficiency and innovation in industrial fluid transmission with precision technology.