Pusher Seals - QB

• 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

• Pressure: up to 51.7 bar (750 psi)
• Temperature: -40° to 204°C (-40°F to 400°F)
• Speed: up to: 23 m/s (75 fps)
• Sizes: 12.7 to 139.7 mm (0.500 to 5.500 inch)

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