SPA For a larger view, please mouseover the image.
Barrier pressure units of the SPA 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).
  • Temperature monitoring with a return line and tank thermometer
  • Barrier fluid directed through oil cooler
  • Reversible double filter (SPA1000: single filter)
  • Manual control of barrier fluid pressure
  • Automatic relief valve for reducing barrier fluid pressure at standstill
  • Level switch with contact for MIN level
  • Measuring instrument connections suitable for fitting contact switching devices (NG160)
  • Provision of an additional pressure connection for monitoring the pump discharge pressure (outside the circuit)
The SPA range is available in 3 basic versions:
Tank capacity 40 l, flow rate 6 l/min.
Tank capacity 100 l, flow rate 12 l/min.
Tank capacity 100 l, flow rate 23 l/min.

The three SPA ranges are designed for hydraulic oil with viscosity values of 12 to 90 mm2/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.

Max. operating temperature in the tank 80 °C (176 °F) (return line max. 90 °C 194 °F)).
  • Storage tank, measuring instruments, cooler and piping are made of stainless steel
  • Fittings, distributor units, shut-off valves and tank lid are made of galvanized steel
  • Chemical industry
  • Petrochemical industry
  • Refining technology
  • Oil and gas industry
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.