Flowserve QB Pusher Seal

Greater reliability and installation ease assured by rugged components, heavy duty seal faces, and cartridge seal configuration
Satisfies all API 682 design and qualification test requirements for single and dual arrangement seals
Optimal face cooling and reduced distortion with available multiport injection
Increased safety and environmental compliance assured by dual seal arrangement, which provides for safety backup and emissions control in hazardous services
Longer equipment life and reliability from design that runs cooler and is less sensitive to vapor pressure margin, even under upset conditions
Combat dirty services with the clog-resistant large, single coil spring in the QBS seal
Handle low lubricity hot water without the need for auxiliary cooling systems with the QBU seal
Handle vaporizing hydrocarbons with the QBQ seal
Handle low vapor pressure margin with the QBQ LZ seal, featuring Precision Face Topography wave pattern on the stationary seal face
Low to moderate pressurized barrier dual seal applications are handled by the QBB face-to-back configuration
Moderate and high pressure pressurized dual seal applications, including Piping Plan 53B, are handled by the QB2B back-to-back configuration
Choice of throttle bushing design: fixed, floating, or segmented

API 682

Arrangement 1 single seal (Common Piping Plans 11, 13, 23, 32, 62)
QB
QBQ
QBS
QBU

Arrangement 2 unpressurized dual wet seal (Common Piping Plans 52)
QB/QB
QBQ/QBQ
QBQ LZ/QBQ

Arrangement 2 unpressurized dual seal with dry running backup (Common Piping Plans 72, 75, 76)
QBQ/GSL
QBQ LZ/GSL

Arrangement 3 pressurized dual wet seal (Common Piping Plans 53A, 53B, 53C, 54)
QBB/QB
QB2B/QB

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