Vessel and Agitator seals | Heavy-duty Cartridge Seal for Boiler Feed Circuit Applications


Features mechanical seal Type 7700

  • California Residents: PROPOSITION 65 WARNING
  • Heavy-Duty Cartridge seal
  • Dual pressurized face-to-face arrangement
  • Externally mounted
  • Dry running or wet running capable
  • Heavy duty design for mixers
  • Accommodates high levels of runout and angular deflection
  • Robust ear drive design for high torque transmission
  • Debris Well Option and Adapter Plate Option
  • Radial Bearing Option
  • Field repairable

Recommended Applications Type 7700

  • Mixer and agitators
  • Other rotating equipment

About Mechanical seal Type 7700

The Type 7700 is a modular dual pressurized, face-to-face, O-ring pusher, cartridge seal designed for severe duty mixer applications. It features a single rotating mating ring used by both inboard and outboard seals. This minimizes the number of components and results in an axially compact design. Inboard and outboard seals are identical, maximizing interchangeability. The Type 7700 is specifically designed to accommodate very large amounts of runout and angular deflection. The seal incorporates modular hardware to provide maximum interchangeability. Two combinations of seal face technology are available, contacting dry running (7700D) and contacting wet running (7700W) to maximize the Type 7700’s flexibility and value.

The heavy-duty Type 7700 is design-specific to serve critically important vessels in batch or continuous processes. It guards the batch from contamination, greatly reduces leakage, and extends Mean Time Between Planned Maintenance (MTBPM). For performance and durability, this dry-running or wet-running double opposed cartridge seal is in a class by itself.

Design Features mechanical seal Type 7700

  • Double opposed cartridge arrangement
  • Tolerates high levels of shaft displacement, radial deflection,
    and eccentricity
  • Dry running(7700D) and wet running (7700W) versions
  • Debris well option
  • Radial bearing option

Material mechanical seal Type 7700

  • Face/Primary Ring Carbon (Dry-Running)
    Carbon (Wet-Running)
  • Seat/Mating Ring Silicon Carbide Tungsten Carbide
  • Hardware 316 Stainless Steel Alloy C-276
  • O-ring Fluoroelastomer Perfluoroelastomer
  • Spring 316 Stainless Steel

Operating range mechanical seal Type 7700

  • Temperature Limits Dry: -40°F to 450°F (-40°C to 232°C ) Wet: -40 to 500°F (-40°C to 260°C)
  • Pressure Limits Dry: Full vacuum to 200 psig (13.8 barg) Wet: Full vacuum to 125 psi(g)/8.5 bar(g)
  • Speed Limits Dry: 400 fpm (2 m/s) Wet: up to 4700 fpm (23.8 m/s)
  • Standard Size Range 0.750 to 8.250 inch

Product Description Type 7700

The Type 7700 Series is a heavy-duty cartridge seal intended for use in critical mixing applications where durability and consistent performance are critical. Dual wet running or dry running designs with modular debris well and bearing housing are available to suit the requirements of the application.

Special attention to internal clearances and the rotating mating ring arrangement allows for as much as 0.180″ T.I.R. runout (radial shaft movement.) Extend MTBR, preserve batch purity and reduce leakage.