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Application of Valve Actuator on Ship Ballast Water System

In order to reduce the crew's labor intensity and improve work efficiency, there is an increasing demand for various electromagnetic stainless steel drive devices. In this way, the ballast water system of the ship has been further improved. The application of the valve driving device on the ship ballast water system cannot be ignored.
The quick opening and closing of the moving device can shorten the time required to open and close the valve, and is easy to control. It can freely use various signals such as DC, AC, short wave, and pulse, and it is easy to meet various control requirements. The power source as a power source is easily accessible. Easy to install, laying and maintenance of wires is more convenient than pneumatic and hydraulic
Pneumatic device air supply can be obtained directly from the compressed air system. Working medium is low pressure compressed air, working pressure is less than 0.8MPa, no pollution, no deterioration, can be directly discharged into the atmosphere. A higher switching speed can be achieved, and a speed control valve can be installed if necessary to adjust the switching speed of the pneumatic device. The gas is compressible and acts as a buffer when the pneumatic device is quickly closed.
The hydraulic device has a compact structure and a small volume. The volume and mass of the hydraulic drive device only accounts for about 12% of the same power electric drive device. The hydraulic drive device has a large driving force, and the transmission is stable and reliable. It is applicable to the valve drive with large diameter and high pipeline fluid pressure, and can be applied to liquid immersion occasions.
The electro-hydraulic drive combines hydraulic and electrical in one, and adopts a pump-controlled hydraulic cylinder mode, which combines the advantages of large hydraulic driving force and short electrical reaction time. Electromagnetic stainless steel electrohydraulic drive device includes motor, hydraulic pump, fuel tank, safety protection module, hydraulic execution module and valve position indication module, etc.
Manually operated ballast water systems often use a diversion valve box, which is an assembly of multiple valve groups. It is driven by manpower and has a simple structure, easy operation, and reliable operation. It is usually used in ballast water systems and small quantities of small ships. Large ships with less ballast tanks
The ballast water system adjusts the floating state of the ship by infusing or discharging ballast tanks at different locations or by transferring between ballast tanks. The system can control and control the pipeline valve remotely, promptly, effectively and quickly through the valve driving device, which can guarantee the normal operation of the various system functions. They also have advantages and disadvantages. Electric devices also have their own drawbacks, their complex structure, mechanical efficiency is low, generally only 25% to 60%, susceptible to changes in the power supply voltage, frequency, by its volume, generally used in small and medium-sized valve occasions. In the wet and salt spray working environment, the service life is reduced and the failure rate is increased. Therefore, dry type should be used as far as possible, and it should not be used in long-term submerged environments. In the explosion-proof occasions, special explosion-proof electric devices are required. The speed of the pneumatic device is not stable, and it is difficult to achieve for a situation requiring a high precision of the switching time, and a delay phenomenon is easily generated. Therefore, the valve driving device has its own advantages and disadvantages on the ship.

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