Professional Sealin Products Manufacturer
Yongbang Seals is a specialized mechanical seal manufacturer headquartered in Jiashan, Zhejiang, China. We combine advanced CAD/CAM-integrated design with precision CNC machining and in-house testing to deliver reliable sealing solutions for fluid-handling equipment worldwide. Over 56% of our production is custom-engineered to meet specific OEM and end-user requirements.
safeguards leak-free industrial equipment operation for global customers with standard products, customized services and reliable quality.
Universal Standard Seal Series
Seal Series for Pool and Spa Pump
Seal Series for Vertical Multi-stage Pump
As a professional mechanical seal manufacturer, Yongbang operates a fully integrated production facility covering raw material inspection, precision machining, surface treatment, assembly, and final testing. Our workshop is equipped with CNC lathes, milling machines, grinding machines, and other precision equipment, with full-process standardized control to ensure accurate and reliable seals.
Yongbang brings together experienced sealing engineers and precision manufacturing professionals focused on mechanical seal reliability and application fit. Through close collaboration across design, machining, testing, and quality control, our team delivers consistent sealing solutions that help distributors serve their customers with confidence.
Our production line covers the full seal manufacturing process — from raw material inspection and CNC turning to lapping, vulcanizing, assembly, and dynamic testing. With 9-axis machining capability and in-house quality verification at every stage, we ensure tight tolerances and repeatable quality across high-volume and custom production runs.
Rubber Vulcanizing & Molding
Secondary sealing elements such as O-rings, rubber bellows, and PTFE wedges are formed using rubber vacuum vulcanizing machines. Vacuum processing eliminates trapped air and micro-porosity, producing elastomer components with superior chemical resistance, consistent compression set, and extended service life across NBR, EPDM, FKM, and FFKM compounds.
Lapping & Polishing
Seal faces are lapped on precision flat-lapping machines to achieve optical-grade flatness within 2 light bands (0.58μm). Both rotary and stationary faces in SiC, tungsten carbide, and carbon graphite undergo controlled lapping sequences to ensure full-face contact and minimal leakage rates at operating pressures.
Metal Bellows Welding
Bellows units are edge-welded using CNC-controlled precision welding systems to produce consistent, high-quality weld joints on every convolution. Each bellows is helium leak-tested and verified with free-length gauging. Full post-weld heat treatment in three stages eliminates residual stress and prevents fatigue failure at weld points.
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