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....
Trong mạch van thuỷ lực nằm giữa bơm và cơ cấu tác động. theo chức năng có 3 nhóm van : 1.Van điều khiển áp suất(presure control valves). 3.Van điều khiển lưu lượng(flow-control valves). 3.Van điều khiển hướng (directional control valves). 4.Van c ạc t út(cartridge valves). Tín hiệu điều khiển : -Tính hiệu số(digital signal). -Tín hiệu tương tự(analogue signal).
Valves are the controlling elements in fluid flow and pressure systems.
Like many other engineering components, they have developed over
some three centuries from primitive arrangements into a wide range of
engineered units satisfying a great variety of industrial needs.
The wide range of valve types available is gratifying to the user
because the probability is high that a valve exists that matches the application.
FIBRO – The latest technology – with a tradition of service Introduction Description of the main components Active gas springs (KF) 2489.14. Passive gas springs (KP) 2489.16. Valve block 2489.00.40/41 Description of the functions Controllable gas spring KF KF + KP system without spring back Heating - cooling Selecting the components KF order form KF + KP order form Dimensions and Order Numbers Active gas springs (KF) 2489.14. Passive gas springs (KP) 2489.16.
The perennially bestselling third edition of Norman A. Anderson's Instrumentation for Process Measurement and Control provides an outstanding and practical reference for both students and practitioners. It introduces the fields of process measurement and feedback control and bridges the gap between basic technology and more sophisticated systems. Keeping mathematics to a minimum, the material meets the needs of the instrumentation engineer or technician who must learn how equipment operates.