| Features and Benefits • Rugged components in a cartridge design are built for the highest reliability and simple installation on API pumps. • Heavy duty seal faces remain flat during operation to minimize leakage. • Multiport flush design improves heat dissipation for uniform face cooling. • Spring holder pumping ring design is patented and flushes spring area. • Part interchangeability between single and dual seal arrangements minimizes inventory requirements and maximizes design flexibility. Specialized designs for specific applications QBQ High balance face meets lowest hydrocarbon emissions levels, less than 500 ppm QBQ LZ Patented wavy face features solve the challenges of lowvapor pressure margin light hydrocarbon services QBB Dual balanced rotating face assembly provides API 682 arrangement 3 reverse pressurecapability QBU Grooved face design improves cooling in hot water applications where cooling water is not available QBS Single spring design provides the highest resistance to clogging |