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  • M-Class Sizes

    NPS ½ FP to NPS 16 SP
    ½″ FP to 16″ SP
  • M-Class Connections

    150# to 4500#, NPT, SW,
    BW, Graylock and Custom
  • M-Class Configurations

    On/Off, Vari-V, Cryogenic, 3-Way Diverter, Double Isolation & Bleed
  • M-Class Temperatures

    -200°C to 788°C
    -328°F to 1450°F
  • M-Class Delivery

    Standard Delivery (16-20 weeks)
    Expedited delivery available.
  • M-Class Quote

    Click here to receive a
    Gosco M-Class Valve quote.

M-Class Valve Downloads

  • M-Class Valve Overview

    M-Class Valves

    M-Class is an elite line of high quality, easily customizable metal seated ball valves that outperform in every application. M-Class valves have specific design features to deal with any combination of abrasive, corrosive, high temperature, high pressure, and high-cycle applications. Features include a proprietary trim hardening procedure, a unique actuator mounting system, truly bi-directional sealing, scalloped seats to prevent powder build-up, and Vari-V & arcuate cut balls.

  • Superior Trim Hardening

    Superior Trim Hardening

    BORONIZING is a thermo-chemical surface hardening process that creates a surface layer that’s so hard, it can’t be measured on the Rockwell C Scale. We use Inconel 718 because it is the best overall metal for corrosion, high temperature, and wear resistance. Our PROPRIETARY BORONIZING has a layer depth over 100 microns (0.004”) and a hardness between HV 2500-2700.

    Compared to HVOF coatings, BORONIZING is:
    Substantially harder, markedly more wear resistant, impervious to corrosion, and is capable of handling huge temperature shocks without spalling or flaking.

  • Bi-Directional Sealing

    Bi-Directional Sealing

    The M-Class Valve design is completely symmetrical and doesn’t have a “Preferred Direction”. It seals bubble tight in both directions with both a full pressure differential,
    OR a 1 psig differential. Gosco Valves are completely bi-directional so installers do
    not need to worry about flow direction and/or high pressure sides.

  • Seat/Spring Design

    Seat/Spring Design

    Gosco's patented seat/spring design is perfect for powder/catalyst applications to prevent build up of powder behind the seats. The spring pushes against the seat while simultaneously sealing against the body so media can not get behind it. Media never gets trapped between the seat and body or between the spring and the seat.

  • Tripod Mounting System

    Tripod Mount

    The M-Class Tripod Mount allows you to install the valve in any orientation without supporting the actuator, and we use Finite Element Analysis (FEA) to guarantee it. The very unique design also eliminates actuator misalignment. Three evenly-spaced prongs define a plane, preventing the actuator from rocking. When paired with a CNC machined mounting plate that cannot move left to right or back and forth, the actuator is guaranteed to be aligned correctly. Additionally, the packing can be adjusted without having to remove the actuator, and the three tripod prongs act as a heat sink to minimize the amount of heat that gets to the actuator.

  • Arcuate Cut Ball

    Arcuate Cut Ball

    An arcuate cut is a profile in the ball that reduces velocity as the valve opens and closes. When a standard ball valve is in the first and last 10° of opening/closing, velocities are very high (especially in the corners), and erosion occurs. With an arcuate cut, the opening on the ball is almost three times as large. This reduces the velocity by spreading out the flow through a larger opening, which reduces wear on the ball and seats. BORONIZING must be used to harden arcuate cut profiles because HVOF coatings are line of sight and can not evenly coat the ball.

  • Exotic Alloys

    Exotic Alloys

    f you can cast it, or it is available in bar stock, Gosco can make it in to an M-Class Valve, even with metals that require vacuum casting (like titanium). We are not restricted to making merely the body from exotic alloys, as we can create all components to suit your needs, right down to the bolting. Our engineering team at Gosco Valves have extensive experience in corrosive applications, and we can recommend the best material to use for your specific application.

  • Made To Order


    Not all processes are the same, and there are several applications where standard valves just don't cut it. Our strength lies in our ability to find solutions to the problems that other manufacturers simply cannot solve. We have a team of specialized engineers, cutting-edge design technology, and a "Say yes" attitude. That gives us the ability to create a completely custom valve to suit your specific needs.

  • Fast Track

    Fast Track

    Not all processes are the same, and there are some applications where even an M-Class valve isn’t enough. That’s when Made to Order comes in to play. We WILL find a solution because we have a team of specialized engineers, decades of experience, cutting-edge design technology, and a "Say yes” attitude. Our strength lies in our ability and drive to find solutions to the problems that other manufacturers simply cannot solve. That is how we will create a completely custom valve to suit your specific needs.

M-Class Configurations