Bagi anda yang bekerja dalam dunia instrumentasi, saya yakin tidak asing lagi dengan FCV (Flow Control Valve). Salah satu alat yang berfungsi mengatur banyaknya aliran dalam suatu sistem perpipaan. Saya googling di internet, jarang ditemui referensi tentang FCV yang berbahasa Indonesia. Mau ngartiin belum ada waktu, maka untuk mambantu rekan-rekan terutama yang masih sekolah untuk lebih dekat dengan alat industri saya upload dalam postingan berikut. Saya ambil dari Emerson Process. Sekilas isi tentang FCV Hand book :

Process plants consist of hundreds, or even thousands, of control loops all networked together to produce a product to be offered for sale. Each of these control loops is designed to keep some Important process variable such as pressure, flow, level, temperature, etc. within a required operating range to ensure the quality of the end product. Each of these loops receives and internally creates disturbances that detrimentally affect the process variable, and interaction from other loops in the network provides disturbances that influence the process variable.

To reduce the effect of these load disturbances, sensors and transmitters collect information about the process variable and its relationship to some desired set point. A controller then processes this information and decides what must be done to get the process variable back to where it should be after a load disturbance occurs. Then all the measuring, comparing, and calculating are done, some type of final control element must implement the strategy selected by the controller.

The most common final control element in the process control industries is the control valve. The control valve manipulates a flowing fluid, such as gas, steam, water, or chemical compounds, to compensate for the load disturbance and keep the regulated process variable as close as possible to the desired set point. Many people who talk about control valves or valves are really referring to a control valve assembly. The control valve assembly typically consists of the valve body, the internal trim parts, an actuator to provide the motive power to operate the valve, and a variety of additional valve accessories, which can include positioners, transducers, supply pressure regulators, manual operators, snubbers, or limit switches. Other chapters of this handbook supply more detail about each of these control valve assembly components.....

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