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  • Block & Bleed Sizes

    NPS ½ FP to NPS 16 SP
    ½″ FP to 16″ SP
  • Block & Bleed Connections

    150# to 4500#, NPT, SW,
    BW, Graylock and Custom
  • Block & Bleed Applications

    Customizable with bubble tight
    sealing, exotic alloys & metal seats.
  • Block & Bleed Temperatures

    -50°C to 675°C
    -58°F to 1247°F
  • Block & Bleed Delivery

    Standard Delivery (16-20 weeks)
    Expedited delivery available.
  • Block & Bleed Quote

    Click here to receive an
    M-Class Block & Bleed quote.

M-Class Valve Downloads

  • Block & Bleed Valve Overview

    M-Class Block & Bleed Valves

    M-Class Block and Bleed Valves transcend competitors' offerings with the highest quality valve in the world, AND, it's completely customizable. Features include live-loaded, fully bi-directional & bubble tight sealing, a proprietary trim hardening process, arcuate cut balls and exotic alloy options. These features make our Block and Bleed Valves extremely versatile, and create the perfect valve for the toughest severe service applications.

  • Configurations


    The Gosco Block & Bleed valve is essentially two bi-directional valves with a bleed valve between them. This means we meet all definitions of API 6D for double block & bleed (DBB), double isolation & bleed (DIB), and OSHA double block & bleed (DBB). Not only that, our valves seal bubble tight in both directions with a 1 psi drop, or full differential. We offer valves in pressures up to Class 4500, in exotic alloys, and we are NACE approved.

  • Bi-Directional Sealing

    Bi-Directional Sealing

    Each of the two ball/seat assemblies in the Gosco M-Class Block and Bleed valve has bi-directional sealing abilities. This means that regardless of which direction the valve is installed in the pipeline, the high pressure from either end can’t reach the bleed port and high pressure from the bleed port can’t reach either end. The Gosco M-Class Block and Bleed valve provides true double isolation since both ball/seat assemblies can seal in either direction at any pressure differential.

  • 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.

  • 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.

  • Exotic Alloys

    Exotic Alloys

    If you can cast it, or it is available in bar stock, Gosco can make it in to an M-Class Block & Bleed 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