**Meta Description:** Seal failure is the leading cause of **Slurry Pump** maintenance. **Zhengzhou Runheng** compares packing, **Expeller Seal**, and mechanical seals for cost and environment. Contact WhatsApp: +86 17737700070.**Technical Content:** For international clients, downtime costs often exceed the price of the pump itself. Shaft seal failure is the primary culprit. **Zhengzhou Runheng** offers three solutions: * **Gland Packing:** Simple and low-cost, but requires continuous seal water. Suitable where water is abundant. * **Expeller Seal (Centrifugal Seal):** A dynamic seal that requires no external water—ideal for remote mines in Southeast Asia. * **Mechanical Seal:** For hazardous or expensive media, we recommend cartridge mechanical seals. Despite higher upfront costs, they offer zero leakage and protect the shaft sleeve. **Keywords:** Slurry Pump Seal, Mechanical Seal, Expeller Seal, Gland Packing, Zhengzhou Runheng, Pump Maintenance.