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Reduce Valve Torque

Valve Torque Reduction

Situation:

A major valve manufacturer wanted to reduce torque in the rotating components and mating surfaces, while still maintaining sealing capability at the mating surfaces. The manufacturer provides a range of valve types to a variety of industries and wanted a solution that could work across different environmental conditions. Key operating requirements included: - Ability to operate across cryogenic to high temperatures - Chemical resistance - fluid and gas; radiation resistance - Compatibility (non-explosive) with liquid and gaseous oxygen, rocket propellant and other explosive materials - Compatibility with valve seating materials (elastomers, plastics, etc.) Dicronite dry lubrication was introduced resulting in lower torque, and less wear and maintenance without compromising seal integrity.

Testing:

To demonstrate Dicronite dry lubrication’s benefit, a test fixture was constructed and a series of tests were run comparing the current situation (unlubricated steel rotating against unlubricated steel) with Dicronite dry lubricated surface rotating against unlubricated steel. - The load on the fixture was progressively increased while measuring the torque required to rotate the stem.

Results:

As shown below, the addition of Dicronite dry lubrication to the rotating surface decreased the required torque by more than 25%. This resulted in increased valve life and decreased valve wear. In addition, Dicronite dry lubrication met the manufacturer’s other operating requirements with its: o Operating range from -188°C to +538°C (-306°F to +1000°F) o Chemical resistance, radiation resistance o Compatibility with liquid/gaseous oxygen and rocket propellants o Compatibility with all metallic substrates, plastics and elastomers Dicronite dry lubrication is widely used in the moving (stems, actuators, balls, etc) and mating (seats, discs, seals, etc) valve components.

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