US 12,258,968 B2
Mechanical seal assembly with double-sealing properties and low pressure area
William Haywood, Monongahela, PA (US)
Assigned to FSI North America, Inc., Coraopolis, PA (US)
Filed by FSI NORTH AMERICA, INC., Coraopolis, PA (US)
Filed on Jun. 20, 2023, as Appl. No. 18/337,903.
Claims priority of provisional application 63/353,887, filed on Jun. 21, 2022.
Prior Publication US 2023/0407868 A1, Dec. 21, 2023
Int. Cl. F16J 15/3256 (2016.01); F04C 27/00 (2006.01); F16J 15/324 (2016.01)
CPC F04C 27/009 (2013.01) [F16J 15/324 (2013.01); F16J 15/3256 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A mechanical seal, comprising:
a rotary subassembly, said rotary subassembly including a sleeve, said sleeve packed against and adapted to be in sealing disposition with a pump shaft of a pump;
a stationary subassembly for attachment to a stuffing box of said pump, said stationary subassembly including a gland, said gland having a front face and a back face and a gland lip extending axially from said back face;
a setting clip over said gland lip;
a lip seal disposed within said gland at said back face below said gland lip, wherein said lip seal prevents lubricant leakage, and wherein said lip seal concurrently acts as a secondary lubricant within said seal; and,
a circlip disposed behind said lip seal below said gland lip and below said setting clip to retain said lip seal within said gland.