A typical system that uses fluids for power consists of a pump, an actuator, a direction control valve and a valve for line relief. Hydraulic systems have many advantages over most other methods of control, and this has led to their widespread use in industrial, mobile, lifting and aerospace equipment. These systems have a high power-to-weight ratio, allow for intermittent operation, reversing or stalling, and respond quickly to any needs for acceleration. They will give service for lengthy periods of time facilitate very reliable operation.
Liquids or fluid used in a hydraulic system have to be very dense and need to be incompressible. Using fluids to move machinery is preferable to other drier methods. Fewer moving parts are required, and the liquid reduces wear and tear on a system. Equipment runs smoothly and with more precision.
Hydraulic control valves are the devices used to control pressures in any hydraulic system that uses a fluid for power. These valves are necessary to have control over the pressure, the rate and direction of flow of the liquid. The underlying purpose of these valves is to allow the fluid to leave or enter specific points in the hydraulic system. They are used along with pumps and cylinders for controlling the flow of the liquid being used to create the required force.
Hydraulic control valves have different classifications based on the functions they are required to perform. Valves may be required to control the pressure flow or to change the direction of the fluid being used. Some valves may also be used just to facilitate operations of switching on or off. Other valves are used for proportional electro-hydraulics or servo-mechanisms. The valve opens and closes the flow of the liquid that generates the required power for the operation being controlled by the system.
Hydraulic valves are essential to complete any hydraulic or fluid power system. They are needed to monitor the direction of the liquid, its flow rate and pressure consistently. They are therefore required to be made to very high standards of quality and robustness. Hydraulic systems create high pressures, and that is the reason these valves have to be made of unyielding materials, like steel. Their working conditions also demand that they have to be manufactured to precise standards so that their repeated operations give the same results even after extensive usage. Correct positioning of valves can also play a role in the efficiency of any hydraulic system.