A mechanical seal is a core precision component widely used in pumps, mixers, compressors, and other industrial rotating equipment. It effectively prevents liquid and gas leakage, ensures stable equipment operation, and reduces maintenance costs. With diverse working conditions in modern industries, different types of mechanical seals are developed to match varying pressure, temperature, and medium requirements. As a professional manufacturer, Dandong Runhe Seal Co.,Ltd. provides a full range of high-performance mechanical seals to meet diverse industrial sealing needs.

Cartridge vs Non-Cartridge Mechanical Seal

The most common classification of mechanical seals is based on assembly structure: cartridge mechanical seal and non-cartridge mechanical seal. A cartridge mechanical seal is a pre-assembled integrated unit with all sealing parts fixed in one housing. It features easy installation, no need for manual adjustment, low error rate, and high operational stability, ideal for high-standard industrial scenarios. In contrast, a non-cartridge mechanical seal is a split structural type with separate components. It is cost-effective, flexible in assembly, and suitable for conventional, low-budget general equipment maintenance and replacement.

Single-Face and Double-Face Mechanical Seal

Classified by sealing face quantity, single-face mechanical seal and double-face mechanical seal serve distinct application scenarios. A single-face mechanical seal has only one pair of sealing friction pairs, with a simple structure and convenient maintenance. It is the most widely used type for clean water, conventional oil, and common low-risk medium environments. A double-face mechanical seal adopts two sets of sealing faces, which can form a closed buffer sealing cavity. It delivers excellent sealing performance for corrosive, toxic, high-pressure, and easily volatile media, effectively avoiding medium leakage and improving industrial operation safety.

Spring-Type Mechanical Seal: Single-Spring vs Multiple-Spring

Spring-type mechanical seal relies on spring elastic force to keep the sealing face closely fitted, which is the mainstream elastic compensation structure for mechanical seals. It is divided into single-spring mechanical seal and multiple-spring mechanical seal. A single-spring mechanical seal has a simple overall structure, strong dirt resistance, and stable operation, perfect for medium with slight impurities and conventional working conditions. A multiple-spring mechanical seal uses multiple small springs for uniform pressure distribution, providing higher sensitivity and compensation accuracy. It adapts to high-speed rotation and small-shaft-diameter equipment, ensuring stable sealing effect under long-term high-load operation.

Balanced and Unbalanced Mechanical Seal

According to hydraulic pressure balance design, mechanical seals are categorized into balanced mechanical seal and unbalanced mechanical seal. An unbalanced mechanical seal features a simple design and low manufacturing cost, applicable for low-pressure and normal-temperature working environments. A balanced mechanical seal optimizes the pressure structure to reduce the axial load on sealing faces, effectively lowering friction and wear. It is the preferred choice for high-pressure, high-temperature, and high-speed industrial equipment, greatly extending the service life of sealing components.

Metal Bellows Mechanical Seal

Different from traditional spring-type structures, the metal bellows mechanical seal uses metal bellows as the elastic compensation and sealing component. It eliminates the failure risk of spring corrosion and fatigue, boasting high temperature resistance, corrosion resistance, and zero auxiliary sealing gap. This type of mechanical seal is widely used in high-temperature oil, chemical corrosive media, and high-vacuum equipment, delivering durable and reliable sealing performance in harsh working conditions.

Why Choose Dandong Runhe Seal Co.,Ltd.?

Dandong Runhe Seal Co.,Ltd. focuses on the R&D, production, and customization of all types of mechanical seals. We cover cartridge and non-cartridge structures, single-face and double-face designs, spring-type, metal bellows, balanced and unbalanced mechanical seals, and support customized solutions for special working conditions. All products undergo strict quality testing, featuring stable sealing performance, low wear, and long service life. We provide cost-effective sealing products and professional after-sales service for global industrial customers.

Dandong Runhe Seal Co.,Ltd.
Add：No.70-43, Wenqing Road, Instrument and Apparatus Park, Dandong, Liaoning, China.
Tel.：86-415-5711666
Mob: 0086-18541507008
Email：export@rhseal.com
Wechat ID: RunheSeal
Web：www.rhseal.com  
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