Marine actuators are electromechanical components used on ships and offshore rigs to control valves, hatches, doors, and other mechanical systems. As ships and vessels face unique challenges from marine environments, actuators must be designed to withstand constant exposure to saltwater, humidity, and temperature fluctuations. Different types of actuators are suited to various shipboard applications.

Pneumatic Actuators

Pneumatic actuators utilize compressed air or nitrogen gas to create linear or rotary motion. They are a popular choice for marine valves due to their corrosion resistance and ability to operate in hazardous areas. Dual-piston actuators provide fail-safe operation by incorporating two cylinders working in tandem. Position feedback options ensure the valve reaches its desired end position. Pneumatic actuators are maintenance-free and do not require electrical power, making them well-suited for remote or underwater applications.

Hydraulic Actuators
Hydraulic actuators transmit motion through pressurized hydraulic fluid rather than compressed gas. They can generate very high torques needed to operate large valves. Marine Actuators and Valves tolerate wide temperature variations and provide high power-to-weight ratios. However, hydraulic systems require more complex piping and components than pneumatic designs. Actuator failure could also release pressurized hydraulic fluid into the environment. For these reasons, hydraulic actuators see more limited use aboard ships compared to pneumatic models.

Electric Actuators
Electric actuators contain electric motors that directly power gearing or screw drives to open and close valves. They offer precise position control through feedback from limit switches or rotary encoders. Low maintenance and simple installation make electric actuators popular for many interior applications. However, their motors and electrical components require protection from moisture in marine environments. Explosion-proof housings allow electric actuators in hazardous areas with adequate venting.

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