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Motor Operated Pilot Valve

Motor Operated Pilot Valves (MOPV)

Contaminant-Tolerant Fluid Controls

The MOPV761 is the latest extension of Marotta’s qualified Motor Operated Pilot Valve series, integrating advanced materials and electronics to reduce weight, life cycle costs, and corrosion sensitivity of shipboard fluid control systems. Using a self-contained seawater valve, (also available in 2-, 3- way), this 4-way, 2-position valve provides two control functions, as a four-port master MOPV and a three-port service MOPV.


  • Visual and electrical position indicator
  • Solid-state controls on single, replaceable circuit board
  • Low-cost maintenance and logistics
  • Ability to operate in any physical orientation


  • Reliable mechanical design
  • Service interval of 25 years
  • Long maintenance interval
  • Robust design
  • Available in 2-, 3-, and 4-way
  • Manual override
  • Seawater corrosion resistant
  • Modular, easy installation

Responding to control signals, the motorized actuator opens and closes the valve by turning a rotor within the valve body. The rotor, which contains the valve’s fluid control passages, rotates 90 degrees to open or close. In the event of a signal or power loss, the rotor is easily actuated manually by an integrated hand crank.

This series will remain leak-tight in seawater containing contaminants through the use of spring-loaded Teflon seats, which remain pressed against the outside diameter of the rotor at all times. This series also uses a modular design which enables easy maintenance, both on ship and in depot. Each module can be easily replaced aboard ship without disturbing the remaining assemblies.


NOTE: The listed performance data may represent specific program requirements and not the design limitations of the technology.

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