Mechanical Seals and Seal Support Systems
Pusher Seals - QB
About this product
QB Series seals are balanced pusher seals available in single and dual seal configurations used for sealing environmentally-restricted products and meeting the most stringent regulations. The QB Series is fully compliant with API 682 Type A requirements.
Features and Benefits
- 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
Specifications
- Metal components:
- 316 Stainless Steel
- Alloy C-276
- Alloy 20
- Rotating Face:
- Carbon
- Silicon Carbide
- Diamond Coating
- Stationary Face:
- Silicon Carbide
- Tungsten Carbide
- Diamond Coating
- Gaskets:
- Fluoroelastomer
- Perfluoroelastomer
- Springs:
- Alloy C-276
- Shaft Sizes:
- 12.7 to 139.7 mm (0.500 to 5.500″)
- Pressure:
- up to 51.7 bar (750 psi),
- Temperature:
- -40 to 204°C
- Speed:
- up to 23 m/s (75 fps)
Configurations
- Single seals
- QB
- QBU
- QBQ
- QBQ LZ
- QBS
- Dual seals
- QBB
- QB2B
- QB-61 – NSF/ANSI/CAN 61 certification
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