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Hydraulic Controls System

4/3/2013 5:10:39 PM | by Anonymous

Hydraulic Controls

Hydraulic controls systems refer to any controls that are not powered by electronics or pneumatic but instead use fluid-based operation. Hydraulic control systems can be operated in various ways but the most basic one involves manual control. It is done by flipping a switch, turning a steering wheel or pulling a lever by a human or robot. The movement of hydraulic cylinders in a hydraulic system can be controlled with the use of directional hydraulic control valves. Directional control valve is an important part of hydraulic machinery as it directs the flow of fluid coming from one or more sources into various paths.


The components of a basic hydraulic system include a hydraulic pump that acquires fluid from a fluid reservoir. The drawn fluid will move through the ports and passages going to the cap end of hydraulic cylinder. When the fluid reached the machine, it will flow throughout the machine giving equal pressure to its inner workings providing force to the whole system. Hydraulic machineries have become very popular because of its capability to transfer huge amount of power through flexible hoses and small tubes. The fluid flowing within hoses and tubes is regulated or controlled by hydraulic control valves. They are typically non-mechanical and instead relies on the undesirable conditions of the substance in order to open or close the valve.


There are a variety of hydraulic control valves today but they can be generally categorized into two namely stop valves and check valves. Stop valves are used so that the flow of fluid can be restricted or stopped either electronically or mechanically. The movement of fluid can also be diverted to one or more directions through stop valves. Check valve, on the other hand, is used to force the flow of hydraulic fluid in one direction with spring-loaded stop. The application of check valves is significant at times when there is a leak or loss of pressurization and preventing a backflow of fluid is necessary.


There are numerous machineries that apply hydraulic controls system for its safety and reliability. One does not have to be concerned with electric shock because of using electric powered devices. Some of the equipment that relies on it includes aerospace vessels and aircraft as well s marine vessels and elevators. Hydraulic brake systems are employed to cars and trucks and other manufacturing and industrial machines. Another advantage of hydraulic controls is its ability to handle large and heavy loads. Since fluid is evenly distributed throughout the system, it can maintain the power it generates even there at times when there are sudden changes in load. It is also preferable when handling specialized applications that require precision and accuracy. In contrast to pneumatic control systems, the use of fluid as a source of energy allows one to easily spot leaks and areas that need repair. In spite of these advantages, hydraulic control systems have drawbacks that need to be taken into account by buyers before purchasing. Since this system makes use of fluid, corrosion is a normal problem that will be encountered. This may lead to frequent maintenance and repairs of the machine. The petroleum products found on the fluid are hazardous to the environment while in use and when not properly disposed.

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