Sealmatic - Home Page
Seal Supply Systems


Barrier pressure units of the BFS range perform all the functions of a barrier system essential for operating double seals (circulation and cooling of the barrier medium, pressurization of the barrier fluid and compensation of leakage). The BFS range is available in 3 basic versions: BFS1000: tank capacity 40 l, flow rate 6 l/min. BFS2000: tank capacity 100 l, flow rate 12 l/min. BFS3000: tank capacity 100 l, flow rate 23 l/min. The three BFS ranges are designed for hydraulic oil with viscosity values of 12 to 90 2 mm /s at operating temperature ( tank temperature). The optimum viscosity of the class of the oil to be used has to be determined separately in accordance with the respective application.

Operating and Installation Schematic

Installation and operating diagram for a BFS system.

Typical Industrial Applications

  • Chemical industry
  • Oil and gas industry
  • Petrochemical industry
  • Refining technology

Functional Description

The barrier pressure for circulation is generated by a gear pump. The setpoint barrier pressure is set on an overflow valve in the mechanical seal return line. From this point on the barrier fluid flows back without pressure through a filter and a heat exchanger to the storage tank. To enable systems (pump, agitator) to be stopped without causing damage to the seal in the event of a malfunction (e.g. power failure, damaged motor, etc.), the barrier pressure unit can be fitted with a pressure accumulator unit. To prevent the pressure in the accumulator discharging to the pressureless storage tank, the return line has a pilot-operated check valve, and the supply line also has a simple check valve. The barrier pressure is retained for a limited time. However, no circulation takes place and no heat is dissipated from the mechanical seal. Installation and operating diagram for a BFS system.

Standard Cartridge Seals
Mechanical Seals As Per API 682
Split Seals
Engineered Seals For Demanding Applications
Standard Mechanical Seals For Pumps & Compressors
Mechanical Seals For Agitators, Mixers, Kneaders & Reactors
Supply Systems & Components
Gas Lubricated Seals for Pumps & Agitators
API 682 / ISO 21049
Technical Information