Flush unit

SPX6 <br/>Flush unit

1 Pressure indicator
2 Needle valve
3 Integral filter
4 Valve

A From external source
B To mechanical seal

Flush unit


The EagleBurgmann flush unit of the SPX6000A4 range consist of a manifold with integrated inline filter supplied together with a needle valve and pressure gauge. Optional available with temperature gauge and/or flow indicator. The unit is used to control the flushing of a mechanical seal.


  • Compact design due to integral filter
  • Modular concept - optional monitoring equipment available

Standards and approvals

  • API 682 / ISO 21049
  • API 682 4th ed. Cat. 2/3 - 1CW-FL
  • API 682 4th ed. Cat. 2/3 - 2CW-CW
  • API 682 4th ed. Cat. 2/3 - 2CW-CS
  • API 682 4th ed. Cat. 2/3 - 3CW-FB
  • API 682 4th ed. Cat. 2/3 - 3CW-BB
  • API 682 4th ed. Cat. 2/3 - 3CW-FF
  • API 682 4th ed. Cat. 1 - 1CW-FX
  • API 682 4th ed. Cat. 1 - 2CW-CW
  • API 682 4th ed. Cat. 1 - 3CW-FB

Functional description

The SPX6000A4 flush unit continuously supplies flushing media from an external source to the mechanical seal. This plan is almost always used in combination with a throat bushing which serves as a throttle device to maintain a higher pressure in the stuffing box to isolate the pumped product from the seal chamber.

Recommended piping plans

Product variants

Designation SPX6000A4
Allowable pressure1) 44 bar (638 PSI)
Allowable temperature1) -20 °C … +120 °C
(-4 °F … +248 °F)
Process connections 1/2" NPT
Metal parts 316/316L

Other versions on request.

1) Design data, permissible working values depend on the actual conditions of service.

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