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  • M-Class Sizes

    NPS 1/2 full port to NPS 16 standard port
    1/2” full port to 16” standard port
  • M-Class Range

    Pressures up to Class 4500
    Temperature: -270 °C/-454°F to 788°C/1450°F
  • M-Class Applications

    Built for the most extreme metal seated applications
  • M-Class Warranty

    1 year or 1 million cycles, whichever comes first
  • M-Class Delivery

    Standard delivery time is 6-8 weeks depending on options
  • M-Class Quote

    Click here to receive a Gosco M-Class Ball 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.

  • Tripod Mounting Pad

    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.

  • Metal Seats

    Metal Seats

    Abrasive and high temperature applications quickly wear out the trim on Regular ball 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.

  • Encapsulated “Soft" Seats

    Hot Seats

    The M-Class encapsulated soft seats are used for high cycle, cryogenic and medium temperature applications. What makes the our “soft” seats unique, is they are live loaded and the “Soft” material is fully encapsulated on all three sides. It is then compressed to 3-4 times the maximum pressure rating of the valve so that it takes a compression set. Afterwards, the seat profile is machined and match lapped to the ball.

  • 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 ten degrees 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 ultimately reduces wear on the ball and seats.

  • 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