MOV (disc style) choke operation and features

For more than six decades, the Cameron multiple-orifice valve (MOV) choke has set the standard for precision flow control in a wide variety of applications all over the world. As one of four main Cameron choke valve technologies, which include needle-and-seat choke valves, control choke valves, and multistage choke valves, the MOV choke is recognized for its proven durability and precise flow control.

The term “multiple orifice” refers to the exclusive design of the MOV, which uses a set of adjacent discs, each containing a pair of circular openings or orifices. Other shapes can be used for custom applications. The two discs are diamond lapped on the mating surfaces to tolerances near two light bands of flatness. This allows for complete shutoff over a prolonged period and precise flow rate control throughout the service life of the equipment. In fact, most MOV chokes meet the requirements of ANSI B104 Class IV shutoff as standard.

MOV choke applications

The extensive MOV line covers 1-in to 6-in [25-mm to 152-mm] sizes that can handle pressures up to 10,000 psi while operating at temperatures ranging from –50 degF to 650 degF [–46 degC to 343 degC]. They are manufactured to meet API, ANSI, and NACE standards.

MOVs are available in both adjustable and positive configurations with a variety of end connections to meet most requirements, as well as angled and inline body configurations.

The near-linear flow characteristics of the MOV make it well-suited for production choke applications, including

  • wellhead
  • manifold
  • separator letdown
  • heater bypass
  • water flood
  • CO2
  • gas lift.

MOV choke sizing

Many years of experience have taught us that paying close attention to the correct choke valve sizing is the first and foremost means of avoiding problems later on. That is why we place a special emphasis on making sure your MOV choke is sized correctly for your particular application. Getting it wrong has implications for controllability, maximum flow capacity, erosion, and the service life of your equipment.

Using the Cameron Choke Valve Sizing Program with our experience in a diverse range of applications, we help you select the optimal choke size.