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  • Vari-V Sizes

    NPS 1/2 full port to NPS 6 standard port
    1/2” full port to 6” standard port
  • Vari-V Range

    Pressures: Class 150, 300 and 600
    Temperature: -40 °C/-40°F to 595°C/1100°F
  • Vari-V Applications

    Soft: Corrosive, High Cycle, Abrasive, High Temperature
    Metal: Corrosive, Abrasive, High Temperature
  • Vari-V Warranty

    1 year or 1 million cycles, whichever comes first
  • Vari-V Delivery

    Standard delivery time is 6-8 weeks depending on options
  • Vari-V Quote

    Click here to receive an F-Class Vari-V Ball Valve quote.

F-Class Vari-V Valve Downloads

  • F-Class Vari-V Control Valves

    Vari-V Control Valves

    When you require precise control of flow, pressure or temperature, the F-Class Vari-V Control Valve provides exactly what you need. Standard 10°, 30°, 60°, 90° V's are cut into the ball to handle the majority of control requirements. Custom profile V's are used for unusual applications requiring special flow characteristics.

    Vari-V Valve
  • V-Balls


    At the heart of every F-Class control valve lies the Vari-V ball. The profile of the V-ball determines the flow characteristic of the valve, and can be changed to suit the application. 10°, 30°, 60° and 90° V-balls are most common, but other profiles are readily available, including the Linear-V, Filler-V and High Turndown-V. The transition between high flow and fine control with the Vari-V is extremely smooth. Custom options are also available.

    Vari-V Balls
  • Custom V-Balls

    Custom V-Balls

    Custom V balls are available for applications that require specific flow requirements which cannot be met using a standard V-ball. With the aid of Computational Fluid Dynamics (CFD), we can create a V-ball with a specific profile to fit any requirement, including high turndown applications. Some of our custom V balls have slots that are as small as a human hair. Anti-cavitation trim is also available.

    Custom V-Balls


    Computational Fluid Dynamics (CFD) determines areas of high velocity/flow in a valve, and assist in trim engineering for applications where velocities need to be controlled. It also determines the flow coefficient (Cv) of F-Class Vari-V balls and aids in designing them to custom specifications. Finite Element Analysis (FEA) ensures that our valves meet the required wall thicknesses and strength, and it confirms the structural integrity of the valve.

  • Superior Trim Hardening

    Superior Trim Hardening

    Gosco uses a proprietary process called boronizing, and we are the only company in the world that uses it as their main trim hardening process. Boronizing is an advanced chemical process which outlasts any coating. It results in a case layer that is extremely hard, corrosion resistant, and capable of handling high temperature shocks.

  • 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.

  • Dual Shaft Packing

    Dual Shaft Packing

    Gosco F-Class valves have two sets of packing, upper and lower shaft packing, for beast possible sealing to prevent shaft leaks.

F-Class Configurations