Material Combinations (Optional)
Seal Faces: Carbon Graphite / Reaction-Bonded SiC / Sintered SiC / Tungsten Carbide
Bellows & Metal Parts: 316L, Alloy C-276, Inconel 718, Hastelloy
Secondary Seals: Flexible Graphite (no elastomers for high temp)
MOR BXHHB BXH are high-performance balanced, rotating welded metal bellows mechanical seals, fully compliant with API 682 Type B standards. They are engineered for extreme high-temperature, corrosive, and crystallizing fluid services in refineries, petrochemical plants, and critical process pumps.
Features
Balanced Rotating Metal Bellows: Welded thin-wall (0.20 mm) metal bellows for superior flexibility, vibration resistance, and zero elastomer dependency.
API 682 Type B Compliant: Meets strict standards for refinery and petrochemical process sealing.
Self-Cleaning Bellows: Rotating design prevents buildup of solids, crystals, or coke.
Distortion-Free Face: Maintains flatness under high pressure and temperature fluctuations.
Compact Cartridge: Fits API 610 pump seal chambers without modification.
Single/Dual Configurations: Available as single seal (Arrangement 1) or dual seal (Arrangement 2/3).
Advantages
Extreme Temperature Resistance: Operates beyond elastomer limits, ideal for hot oils, steam, and molten fluids.
Corrosion & Crystallization Resistance: Performs reliably in corrosive and crystallizing media.
Zero Elastomer Failure Risk: Metal bellows eliminate elastomer degradation in harsh conditions.
Long Service Life: Welded bellows and robust faces reduce maintenance intervals.
API Compliance: Meets stringent industry standards for safety and reliability
Applications
Refinery crude and vacuum distillation pumps
Hydrocracking, catalytic reforming, and coker units
High-temperature heat transfer fluid pumps
Petrochemical process pumps handling acids, alkalis, and solvents
Pumps for crystallizing, fouling, and coke-forming fluids
Test Standards
API 682 "Shaft Seal Systems for Centrifugal and Rotor Pumps" (4th Edition)
API 617 "Axial and Centrifugal Compressors and Expanders for the Petroleum, Chemical, and Gas Industries"-Compressor (7th Edition)
GB/T 14211-2019 Test Methods for Mechanical Seals
HG/T 2099-2003 Test Specification for Mechanical Seals for Kettles The dynamic balance test of rotating parts adopts ISO 1940 standard
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