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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, Diverter, Double Isolation & Bleed
  • M-Class Temperatures

    -270°C to 788°C
    -454°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 Valves

    M-Class Valves

    M-Class is an elite line of made-to-order, metal seated ball valves. They are designed for any combination of abrasive, corrosive, high temperature, high pressure, and high-cycle applications. Options include Vari-V and arcuate cut balls, exotic alloys, and scalloped seats. Not only do M-Class Ball Valves provide superior performance for the toughest applications, they are truly bi-directional and provide bubble-tight shut off.

  • Trim Hardening

    Trim Hardening

    Instead of conventional HVOF coatings used by the majority of metal seated valve manufacturers, Gosco uses a proprietary process called boronizing. Boronizing is a thermo-chemical surface hardening process that creates a surface layer so hard, it can’t be measured on the Rockwell C scale. We use Inconel 718 as the base material because it is the best all around material for corrosion, high temperature, wear resistance and temperature shocks. The Gosco boronizing process has a layer depth of over 100 microns (0.004”) and a hardness between HV 2500-2700. Compared to HVOF coatings, it is better in every way: Considerably harder, much more corrosion and wear resistant, and capable of handling huge temperature shocks without spalling or flaking.

  • Tripod Mounting System

    Tripod Mount

    The patented M-Class Tripod Mount allows you to install the valve at any angle without supporting the actuator, while eliminating actuator misalignment. The three evenly-spaced prongs create 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. The three tripod prongs also act as a heat sink to minimize the amount of heat that gets to the actuator.

  • Metal Seats

    Metal Seats

    Abrasive and high temperature applications quickly wear out the trim on soft seated valves, so using the right custom metal seated configuration can extend the life of your valve by years. We offer all the traditional trim options, such as HVOF coatings (e.g. chrome/tungsten carbide on 410 SS), but our preferred trim material is boronized Inconel 718. It is considerably harder, more wear resistant, can handle temperature shocks better, and is more corrosion resistant than any coating on the market.

  • Scalloped Seats

    Scalloped Seats

    Our competition attempts to prevent media from getting between the seat and spring by sealing the outer edge and back of the seat. Gosco Valves' patented design allows the media to flow freely behind the seat using special scallops. Since the media flows freely, it never gets trapped. The size, quantity, steepness of the angle, and spacing of the scallops vary with the particle sizes and the pressure inside the valve.

  • 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. When the HVOF process is used, the coating quickly spalls off.

  • 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

    What good is an elite custom ball valve if it can't be delivered when you need it? Fast Track, our expedited delivery service is designed to help you meet near-impossible deadlines. The fee is based on accelerated engineering and design, supplier expedite charges, air freight, extra manpower and other associated costs. What does this buy you? The best custom ball valve and a solid guarantee: if we don't deliver on time, we will waive all Fast Track fees.

M-Class Configurations