Triplet Type Main Stop Valve Upgrade

The Turbo Parts Triplet Type Main Stop Valve upgrade reduces solid particle erosion (SPE), thereby increasing valve component life!

View the video on the advantages of the main stop valve upgrade and for additional information call Turbo Parts today at (518) 885-3199 or use our Contact form.

Solid Particle Erosion (SPE) occurs where steam and solid particles at high velocities make an abrupt change in direction. SPE reduces component life and decreases valve reliability.

A thorough investigation of stem and bypass valve erosion on main stop valves led to an engineering design study of these issues. The evaluation resulted in the design of Turbo Parts Triplet Type Main Stop Valve upgrade as an effective countermeasure to the solid particle erosion seen in conventional designs.

The main stop valve upgrade addresses these issues with a configuration that allows for high velocity bypass steam to flow parallel to the stem, thus eliminating stem erosion issues.

Mark Passino, Turbo Parts’ Engineering Manager, said:

The triple bypass main stop valve upgrade significantly reduces solid particle erosion (SPE). The engineering experts at Turbo Parts design each valve to optimize the flow geometry and apply the latest materials and nanocoating technology to extend component life. The overall valve offering is a drop in replacement that reduces valve maintenance costs and increases time between valve outages.

Advantages of Triplet Type Bypass Main Stop Valve:

  • TPL Triplet poppet valve geometry, contoured to gradually turn the steam flow parallel to stem
  • Proprietary TiSiCN nano coating applied to poppets for improved SPE resistance
  • Flared conical diffuser shape of the bypass holes reduce particle velocity and improve direction
  • Stellite shielded pressure seal head improves SPE resistance on forward facing steps
  • Reduced valve maintenance
  • Applicable to subcritical and supercritical plant applications
  • 30+ Years of replacement experience (175 MW to 700 MW)
  • 8” to 15” Valves

Turbo Parts (TPL) manufactures and supplies all parts for Triplet Type Bypass Main Stop Valve. MD&A’s Turbine-Generator Repair Facility in St. Louis performs the final valve assembly.

Triplet Type Main Stop Valve Upgrade

Triplet Type Main Stop Valve Upgrade



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Mechanical Dynamics & Analysis, Ltd.   |   19 British American Blvd., Latham, NY 12110   |   P (518) 399-3616   |   F (518) 399-3929