Design Features：
1. Clever Back-to-Back Arrangement: The two pairs of sealing faces are arranged back-to-back, effectively balancing axial forces and reducing the risk of seal failure due to uneven axial forces. This also enhances the stability of the seal under complex operating conditions, improving its reliability and service life.
2. Significant Advantages of Non-Contact Operation: The sealing faces operate without contact, avoiding the wear problems of traditional contact seals. This significantly reduces friction loss and heat generation, minimizing equipment maintenance costs and downtime, and ensuring long-term stable operation of the seal.
3. Nitrogen Isolation Gas for Near-Maintenance-Free Operation: Using nitrogen as the isolation gas, the stable properties of nitrogen require almost no frequent maintenance. It forms an effective isolation barrier in the sealing gap, preventing process gas leakage and ensuring the safety of equipment and the environment.
4. No Combustion Required and Simple Control System: This dry gas seal can operate normally without meeting combustion conditions, simplifying system design and operation. Simultaneously, its control system is relatively simple, easy to operate and manage, reducing the technical requirements for operators and improving work efficiency.
5. Zero Media Leakage and Minimal Nitrogen Ingress: Achieves zero media leakage, effectively avoiding waste of process gases and environmental pollution. Simultaneously, only a small amount of nitrogen enters the pump, having minimal impact on the internal process, ensuring normal pump operation and process quality.
Operating Parameters：
- Wide Temperature Range: Operates stably within a temperature range of -40℃ to 260℃ (depending on material selection), maintaining excellent sealing performance in both low-temperature liquefied gas environments and high-temperature process conditions.
- Flexible Pressure Adaptability: Withstands pressures from 0 to 2.0MPa, meeting the sealing requirements of different pumps under various pressure conditions, ensuring seal reliability and stability.
- Speed and Flushing Adaptability: Suitable for operating conditions at speeds of 3600 rpm or 25 m/s, while employing the PLAN74 flushing solution to effectively remove impurities and heat from the sealing area, ensuring cleanliness and cooling of the sealing surface and extending seal life.
Standards and Product Applicability：
- Strict adherence to standards: Adhering to industry standards such as API 682 and JB/T4127.1 ensures that the product’s design, manufacturing, and performance comply with relevant international and domestic specifications, guaranteeing product quality and reliability.
- Wide range of applications: The 3NC-BB model conforms to API 682 standard layout mode 3 and is widely used in pumps for aromatics, ethylene oxide, methanol, etc., in the petrochemical and coal chemical industries, as well as other rotating equipment, providing reliable sealing protection for the stable operation of these critical devices.
