Specification of a control valve begins with a control loop. The control loop in every industrial application includes transmitters to transmit the signal to the controller then to the positioner and finally to the actuator of the control valve. The valve assembly consists of : Positioner to convert electric signal to pneumatic signal. Actuator for …
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Control valves in process industries are used to regulate various fluids and to control important process parameters like flow, level, temperature, pressure, and so on. The tips and rules of thumb that engineers used in selecting and sizing control valves are fuzzy, and applying alternative rules may lead to conflicting answers. Rules of thumb must …
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What is a valve? We can control the liquid flow or gas flow in an industrial process with the help of a valve. It would do this by different methods such as closing, opening, or blocking various passages in a pipe system. So this device can control the flow and pressure in a system, these …
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What is a solenoid valve? This type of valve is used when we need to control the flow of the fluid automatically, these valves are mostly used in many industrial applications. Solenoid valves can be controlled by electric current these valves are called a two-position device due to the fact that they could be either …
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What are the types of pressure control valves The major function of a pressure control valve is to protect the system from overpressure. This pressure could occur due to the decrease in fluid demand or it can also happen because of the surge which could cause during the opening and closing of the valve. These …
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What is a hydraulic valve and what is its purpose Hydraulic valves control the direction and flow rate of the valve. Hydraulic control valves can be divided into three types they are directional control valves, flow control valves, pressure control valves, and non-return valves. Hydraulic system uses many valves to control the flow of fluids, …
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What is a plug valve and what are plug valves used for Plug valves are widely used in the process industry, these valves operate by rotation motion and are used to stop and start the fluid flow. Plug valves are basically on-off valves, based on a plug with a rectangular hole through which the fluid …
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What is a needle valve and what is the purpose of needle valves The needle valve got its name because of its narrow tapered plug and port arrangement. The needle valve is small in size and the control of the fluid flow can be done accurately. Needle valves can be used if the pressure heads …
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Describe control valves Control valves are used to control the flow and direction of fluid such as gas, water, steam or chemical compounds. They are controlled so that the load disturbance can be compensated. Control valves are used in gas centrifugal compressors to avoid damages in the compression machine. Control valves are used in the …
Why do we need control valves Control valves are used to control the flow of the liquid, it can regulate the fluid flow when the position of valve plug or disk is changed from the force from actuator to do this the valve must not have fluid with external leakage and it also requires a …
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