Mechanical Seals

mechanical seal cartridge style  mechanical seal pressure testing mechanical seal repair testing and troubleshooting  
Cartridge Style
Mechanical Seal
Repair Service Support Systems


Top entry Mixers and bottom entry agitators on sealed tanks will have a mechanical seal of some sort. For many sanitary process vessels, the mixer must have some type of sealing barrier to provide either a dust tight vapor seal, a pressure tight seal to allow pressure and or vacuum in the mixtank, or an aseptic sealing device to provide a hygienic seal between the tank id and the outside of the vessel. There are a variety for mixer use, including single dry running  double ssemblies with a liquid or gas flush, and a variety of other lip seals and packing materials which can be used. Starting with the least expensive sealing mechanism for a rotating mixer or reactor, we have a simple dust cover assembly, and elastomer lips sealed, a spring-loaded CIP mixer seal, a packing seal, a USP class VI lip seal, a single dry running mixer seal, a single with an aseptic debris well, and then we have higher pressure double,custom steam sterilizable and split mechanical seal options.

Biomixer mechanical seal replacement/upgrade

biomixer replacement mechanical seal 

We replace, repair, retrofit, upgrade any Lightnin Biomixer mechanical seal (and other seals).   Direct drop in replacement seal, with certs.   Mechanical seal is single dry running, 316ss, FDA carbon face vs FDA Silicon carbide face with FDA EPDM elastomers.    USP VI elastomers and seal faces are available as well as non squealing mechanical seal design for upgrades.   

Dry Running

  • cGMP
  • Available in Single and Dual Cartridge Designs
  • No Seal support needed for most applications... consult factory
  • Nitrogen can be used in both single and dual cartridges in certain applications.
  • Special face material for dry running certified FDA, USP Class VI, Bovine Free
  • Upgradable Whisper Seal Technology available for low pressure/slow speed applications providing a much quieter environment for operators
  • Available with Aseptic Debris Well


  • Assume mixer/agitator design of 350rpm max speed, 50psig at 250f.
  • Sizes for 3/8” dia shaft to 6” + available
  • Bottom entry seals and double liquid or gas seals available on request, please call WMProcess.
  • Private label and volume discounts for large volume OEMs
  • DETAILS OF SEAL: Single or dual dry running mixer seal
  • CARTRIDGE STYLE SEAL- much easier to install than traditional component seal
  • FACES = GRAS Carbon vs Silicon Carbide seal faces (USP VI silicon carbide seal face)
  • DEBRIS WELL = with 1/4” NPT ports and elbow fitting and plugs (TC optional)
  • BASE METAL = 316L SS for bolt up gland and debris well and seal housing
  • SPRINGS = Hast C
  • ELASTOMERS = USP VI EPDM (other elastomers available see options)
  • Cartridge seal is static pressure tested prior to packaging
  • Seal detailed drawing provided
  • Delivery time = 4 weeks or less
  • Helpful Links
  • Mixer Mechanical Seal With Debris Well Drawing (PDF)
  • Mechanical Seal Photo Gallery
  • Mechanical Seal Brochure
  • Squealless Mechanical Seal


  • other elastomes available include Silicone, Viton, Buna – upcharge for Kalrez or Chemraz perfluoroelastomer
  • Aseptic cleaning and vacuum packing of seals
  • TC connections on debris well port
  • TC connection caps, gaskets, clamps for inlet/outlet
  • Hast C wetted parts available
  • call for higher speed, pressures over 45psig, high temp, or for us to review any specific sealing application
  • double liquid flush and gas seals
  • CIP/SIP sanitary valves for TC debris well inlet/outlet
  • Private label seals for large volume OEMs
  • We offer repair, retrofit, and reconditioning/pressure testing of any mechanical seals.

Seal Repair

We supply new mechanical seals, repair anyones seals, and can provide service assistance for mechanical seal problems. Our mechanical seal offering includes:

  • New agitator and mixer mechanical seals
  • Sanitary and hygienic mechanical seal options
  • Mixer mechanical seal repair, troubleshooting, and optimization
  • Mixer lip seals, packing, separately mounted seals
  • Mixer seal debris well retrofit and electropolishing
  • FDA mixer lip seals and USP VI agitator elastomers

Cartridge Style

  • Cartridge type mechanical seals  are much easier and quicker to install than component seals. 
  • Installation is quicker, easier, and no measuring or setting of heights is required. 
  • Cartridge seals are available for mixers, agitators, reactors, pumps, and other rotating equipment.
  • White Mountain Process repairs and service any manufacturers mechanical seal, either single or dual arrangement.
  • White Mountain Process offers Dry Running single and dual cartridge seals... also available with Whisper Quiet Seal Technology

Support Systems

  • Seal support systems are available from WMProcess to support single and dual mechanical seal assemblies in all rotating equipment. 
  • Seal Support systems available as pressurized or non-pressurized vessels with or without cooling coils.
  • Both Single and Dual Seals are pressure tested before being shipped from the factory
  • All instrumentation available as needed to support the seal environment

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