Product/Service

QBQ Multi-Spring Pusher Seal

Source: Flowserve, Flow Solutions Division
A balanced multi-spring pusher seal for low emission light hydrocarbon services with specific gravities down to 0.45
A balanced multi-spring pusher seal for low emission light hydrocarbon services with specific gravities down to 0.45 utilizing multi-port flush. This proven design reduces the need for multiple seals to comply with low emissions regulations. The QBQ is also available in tandem and double seal configurations and meets API 682 requirements.

Features/Benefits

  • Largest number of refinery low emission installations - provides proven low emission performance
  • Single QBQ seal emission rate less than 500ppm - facilitates compliance with most emission regulations
  • Increased seal balance ratio and reduced face area - suppresses product flashing and minimizes face heat generation
  • Premium laboratory tested face materials - using stronger metal-impregnated carbon structure and high quality silicon carbide mating face provides improved heat dissipation characteristics
  • Heavy-duty rotating face design - minimizes distortion at high pressure
  • Seals furnished with multi-port injection - improves heat dissipation, providing uniform face cooling and improved MTBF
    performance in light hydrocarbon service
  • Compact design - can be furnished as a cartridge assembly and fits most API and ANSI big bore pumps
  • Standard line of floating carbon throat bushings available - helps to meet suppression requirements of API 682
  • QBQ is a modification of an existing seal - provides high degree of parts interchangeability with conventional QB seals

Materials of Construction

Metal Parts:

AISI 316 Stainless Steel, Alloy C-276

Rotating Face:

Metal Impregnated Carbon

Stationary Face:

Silicon Carbide, Tungsten Carbide

Gasketing:

Nitrile, Fluoroelastomer

Perfluoroelastomer

Springs:

Alloy C-276

Operating Parameters

Pressure:

Up to 750 psig (5170 kPa)

Temperature:*

Water or Water Solution:

32F to 275F (0C to 135C)

Other Liquids:

-40F to +400F (-40C to +204C)

Liquids:

Corrosive and Noncorrosive

Peripheral Speed:

Up to 75 ft/sec. (23 m/sec.)

Specific Gravity:

.45 and higher

Shaft Sizes:

1/2" through 5-1/2" (12mm through 140mm)

*Depending on materials selected

Flowserve, Flow Solutions Division, 222 W. Los Colinas Blvd., Suite 1500, Irving, TX 75039. Tel: 801-489-2378; Fax: 801-489-2686.