Walter Stauffenberg GmbH Co. KG

- Model Type SMK20 - Test Couplings with Ball Check



Test Couplings with ball check fornormal hydraulic applicationsandhydraulic applications with high-viscosity fluids.

Area of Application

  • Monitoring and control of pressure
  • Venting
  • Sampling in high- and low-pressure systems


  • Coupling at system pressure level
  • Leakproof connection before ball valve is open
  • Simple connection to measuring, control and switching devices
  • Self locking metal guard cap


  • Suitable for hydraulic oils and other mineral oil based fluids  (Check compatibility of sealing material)
  • For use in conjunction with other liquid or gaseous  media please consult STAUFF
  • In case of ultimate tightness requirements for  gaseous media, a special Gas-type is available

Working Pressure

  • Max. working pressure 630 bar / 9137 PSI  For SMK style G and K the recommended working  pressure of fitting manufacturer has to be applied.
  • Joining under pressure up to 400 bar / 5801 PSI max.


  • Metal parts made of:
  • Steel, zinc/nickel-plated = C6F (CrVI-free)


  • Stainless Steel V2A (1.4305 / AISI 303) on request
  • Stainless Steel V4A (1.4571 / AISI 316Ti) on request

Ball made of Stainless Steel
Sealings made of:

  • P = NBR (Buna-N®)  Temperature range -20 °C ... +100 °C / -4 °F ... +212 °F
  • V = FPM (Viton®)  Temperature range -20 °C ... +200 °C / -4 °F ... +392 °F
  • E = EPDM (Ethylene Propylene Diene Rubber)  for brake fluid,  Temperature range -40 °C ... +150 °C / -40 °F ... +302 °F

Protection Cap

  • The complete STAUFF-Test-20-type-SMK range is also  available with a hexagonal protection cap made of steel  or plastic protection cap.

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