Single power plants use hundreds of valves to control every aspect of its operation. Valves are in conjunction with a controlling actuator and they are used to control pollution, feed water, cooling water, chemical treatment, bottom ash and steam turbine control systems. They normally work in a harsh environment and they are exposed to a variety of chemicals, abrasive materials and high temperatures.
Valves are critical in optimizing efficiency, and they are often the final control element in the operation of a power plant. Valves and actuators can operate at higher pressures, frequency as well as temperatures. The basic technology for most valves and actuators have remained unchanged and innovative applications, as well as design modifications, are being developed to withstand the demanding environment.
These improvements can reduce costs by supporting the control valves ability to provide better performance for high-pressure steam bypass, critical power plants and turbine bypass.
Actuators and valves together create a single unit that controls the valve. The actuators perform different motions and sequences that include linear, pivoting and rotating motions, and they are powered by the pneumatic hydraulics or electrical energy. The actuator receives a control signal from the automation systems. The signal is converted into a motion so that it controls the element of the actuating element assumes a corresponding position. The control valve is a stroke motion with flaps, ballcocks or rotary plug valves and they provide pivoting motion.
The valves play a crucial part in the plants and they provide quick operational systems for the workflow and to ensure that all the equipment works accordingly and efficiently.
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