Skip to Content

08.20.2025 |

Maximum Allowable Stem Torque (MAST) is the maximum torque that a valve stem can withstand without risk of mechanical failure. This value is essential for actuator sizing, ensuring long-term performance and preventing costly downtime. Oversized actuators or underestimated torque limits can lead to premature stem damage and unsafe operating conditions.

Why MAST Matters

Engineers and specifiers rely on published MAST values when selecting and automating valves. Compliance with standards such as API 608 requires specific torsional safety factors, making accurate stem torque data critical in system design.

SVF MAST Technical Briefs

SVF Flow Controls has performed extensive testing on valve stems and publishes detailed reports that document torque capacities and safety factors. These reports are essential tools for engineers working on actuator sizing and valve specification.

Download Tech Brief 2006 – 316SS Stem Report (PDF)
Download Tech Brief 2000 – 316SS EZ-MAX Stem Report (PDF)

How to Use These Reports

  • Identify the valve series and stem material being specified.
  • Refer to the MAST values provided in the report.
  • Compare against actuator maximum torque output.
  • Apply the recommended safety factors from the reports.

Conclusion

For accurate torque data and reliable valve automation, always consult published MAST test reports. SVF’s technical briefs provide the engineering foundation for safe and efficient actuator sizing.

Back to Learning Hub