Materials of Construction
The QB Series balanced pusher seals are designed to operate under pressures up to 750 psig (51.7 bar) and temperatures ranging from -40 to +400°F (-40 to +204°C). They are suitable for fluids with a specific gravity of 0.4 and higher and can handle surface speeds up to 75 fps (23 m/sec). The shaft sizes range from 0.50 to 5.50 inches (12.70 to 139.70 mm).

Operating Parameters
The seals are constructed with metal components such as 316 Stainless Steel, Alloy C-276, and Alloy 20. The rotating face materials include Carbon and Silicon Carbide, while the stationary face materials are Silicon Carbide and Tungsten Carbide. Gaskets are made from Fluoroelastomer and Perfluoroelastomer, and the springs are composed of Alloy C-276.

Product Features
The QB Series seals are available in single and dual configurations, designed for sealing environmentally-restricted products and complying with API 682/ISO 21049 Type A requirements. They feature rugged components in a cartridge design for reliability and easy installation on API pumps. The heavy-duty seal faces minimize leakage, and the multiport flush design enhances heat dissipation for uniform cooling. The patented spring holder pumping ring design flushes the spring area, and part interchangeability between single and dual seal arrangements reduces inventory needs and increases design flexibility.

Specialized Designs
- QBQ: High balance face for low hydrocarbon emissions, less than 500 ppm.
- QBQ LZ: Patented wavy face for low vapor pressure margin light hydrocarbon services.
- QBB: Dual balanced rotating face assembly for API 682 arrangement 3 reverse pressure capability.
- QBU: Grooved face design for improved cooling in hot water applications without available cooling water.
- QBS: Single spring design for high resistance to clogging.

Dimensional Data
The document provides detailed dimensional data for various seal sizes, indicating minimum and maximum dimensions for different components. For sizes and conditions not listed, users are advised to contact their local Flowserve representative.

Contact Information
Flowserve Corporation provides contact details for their offices in the USA, Canada, Europe, Middle East, Africa, Asia Pacific, and Latin America for further inquiries.