Contaminant-Tolerant Fluid Controls
The qualified Motor Operated Pilot Valve series, integrates 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 pilot control valve provides two control functions, as a four-port master MOPV and a three-port service MOPV.
This motor operated valve 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.
To learn more about these motor operated valves or any other naval control system solutions we provide, get in touch with us today.
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Fill out the form below to download MOPV Article
MOPV761
A four-port master MOPV is used to initiate aqueous film forming foam (AFFF) concentrate flow and fire-main flow for mixing and disbursement to AFFF systems aboard the Navy fleet. The three-port MOPV will serve as the local disbursement valve for either fire-main flow or the AFFF mixture.
Responding to control signals, the motor operated actuator opens and closes the valve by turning a rotor within the valve body. The rotor, which contains the seawater-compatible control valve’s fluid control passages, rotates 90 degrees to open or close. In the event of a signal or power loss, this motor operated valve has a hand crank that is easily actuated manually to ensure control.
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Design Features
- 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
Shipboard Applications of Motor Operated Pilot Valves
MOPVs areelectrically actuated flow control components in various shipboard systems including naval fire suppression, seawater distribution, and auxiliary fluid control systems. These require reliable directional control under variable operating conditions, which Marotta’s MOPV provides. They function as master and service valves to route, isolate, or initiate fluid flow in multi-branch systems such as AFFF concentrate delivery and fire-main flow control. These components are suitable for use in contaminant-laden seawater, offering strong resistance to sand, salt, grit, and organic debris. Their manual override capability ensures operational control can be maintained even during periods of power or signal loss. The modular construction of these units supports on-ship servicing and depot-level maintenance without the need to disturb adjacent piping or assemblies.
Frequently Asked Questions About Motor Operated Pilot Valves
What is a motor operated pilot valve?
An MOPV is a motor-driven directional control valve used to route fluid flow between multiple ports. Our MOPVs support two-, three-, and four-way configurations to serve both master and service control functions. Rather than linear stem movement, operation is achieved through rotational actuation.
Why are MOPVs used in shipboard systems?
Many shipboard systems require motorized valves that are capable of reliable operation in corrosive and debris-filled seawater environments. These motorized fluid control valves provide long-term service with low maintenance requirements, making them well suited for naval platforms with limited maintenance access. Applications for these components include shipboard emergency control systems such as fire-main and AFFF distribution systems.
How do Marotta MOPVs handle power or signal loss?
In the event of a power or signal loss event, our MOPVs feature a manual hand-crank override. This supports fail-operational control for fluid isolation and routing, rather than automated fail-safe operation. This feature ensures crews can respond to emergency situations in the most appropriate manner.
Are MOPVs serviceable onboard?
With their modular construction that separates valve body, actuator, and mounting plate, these long-life shipboard components can be replaced individually while onboard without disturbing the full assembly. Our modular fluid control assemblies lead to reduced downtime as well as simplified logistics.
What types of fluids are MOPVs designed to control?
These mission-critical fluid routing solutions are compatible with seawater and aqueous solutions used in many shipboard auxiliary systems. Our corrosion-resistant flow hardware provides leak-tight performance in contaminated fluid conditions.