hydraulic Marine valve and electro-hydraulic actuator

when abnormal need to deviate from the resistance and high thrust and quick travel speed, it adopts hydraulic or electric hydraulic actuators. Hydraulic Marine Industrial Valves actuator used in piston above and below the piston of hydraulic fluid to determine the position of the valve. The hydraulic pressure can be provided by the hydraulic system outside the factory ( Figure 5. 30) 。 Its structure and cylinder actuators are similar, with a cylinder and a piston, piston's role as a room divider between two points. Hydraulic actuator spring without failure, so the failure effect needs - - Series of cutting system, it is very complex, and requires special engineering. On the other hand, for electric hydraulic of board. Line organization, would rather use hydraulic actuators than using an external Marine valve and hydraulic system, it has an own house hydraulic source, the source hydraulic actuator ontology smaller-sized electric actuators operate 110 - 120 v ac, 60 hz one-way power, current for 3 ~ 30 a. Larger electric actuators using 220 - V, three-phase, 50-240 Of 60 hz power electricity, or is 125 - The 250 v direct current. Need electricity to 300 a. Particularly large actuator even need more voltage ( Up to 480 v ac) 。

when need artificial substitute manual operation or manual device, most of the electric actuator can allow the motor to be release, can be used to release the clutch of the handwheel, with manual valve valve position. Due to the complexity of electric actuators are electrical and mechanical properties of most check, adjustment and operation procedures recommended by was made by the manufacturer or authorized service center. An electrical signal to send people to the internal pump, the pump will be hydraulic fluid from a container to send people to the piston above and below.

because of liquid incompressibility, adopts hydraulic or electro-hydraulic actuator has the advantage that has a better ability of resistance to deviate from these for throttling condition is very important, because when close to the seat adjustment components throttling condition is unstable. In some cases, these actuators are used for low amplitude variation range of traditional Industrial Valves, such as butterfly valve. For special projects, they can be designed to have a good, fast travel speed, sometimes in less than one second closed long stroke, this point in the same security piping system is ideal. Hydraulic Marine valve and electro-hydraulic actuator fault is the accountability, huge bulky, particularly complex and need special projects.

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