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  • M-Class Sizes

    Available in sizes from 1/2” full port to 16” standard port
  • M-Class Range

    Pressure up to 4500# Class Temperature -454 °F - 1300 °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 applications quickly wear the trim on regular ball valves, so using the right custom metal seated configurations can extend the life of your valve by years. We offer several custom trim options, including coatings (e.g. chrome carbide/tungsten carbide on 410SS), diffusion processes (e.g. boronized Inconel/Hastelloy) and ceramics (e.g. silicon nitride, aluminium zirconia). Every trim option has its advantages and disadvantages, so knowing which configuration to use is the key to our success.

  • Hot Seats

    Hot Seats

    Hot Seat is a combination metal/graphite M-Class seat option. It is created by bonding layers of graphite and encapsulating them with a metal retainer ring, then live-loading it to compensate for temperature fluctuations. This low cost alternative to traditional metal seats thrives in high temperature, high pressure, and corrosive conditions.

  • 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