General 27.14 Common Control valve problems adminFeb 3, 2020 Control valves are subject to a number of common problems. This section is dedicated to an exploration of the more...
General 27.13 Control valve characterization adminFeb 3, 2020 Control valves are supposed to deliver reliable, repeatable control of process fluid flow rate over a wide range of...
General 27.12 Control valve sizing adminFeb 3, 2020 When control valves operate between fully open and fully shut, they serve much the same purpose in process systems as...
General 27.11 Split-range control adminFeb 3, 2020 There are many process control applications in industry where it is desirable to have multiple control valves respond...
General 27.10 Valve positioners adminFeb 3, 2020 The reason why a pneumatic control valve’s stem position corresponds linearly to the amount of air pressure applied...
General 27.9 Pneumatic actuator response adminFeb 3, 2020 A limitation inherent to pneumatic valve actuators is the amount of air flow required to or from the actuator to cause...
General 27.8 Actuator bench-set adminFeb 3, 2020 Valve actuators provide force to move control valve trim. For precise positioning of a control valve, there must be a...
General 27.7 Valve failure mode adminFeb 3, 2020 An important design parameter of a control valve is the position it will “fail” to if it loses motive power. For...
Education 27.6 Control valve actuators adminFeb 3, 2020 The purpose of a control valve actuator is to provide the motive force to operate a valve mechanism. Both...
Education 27.5 Valve seat leakage adminFeb 3, 2020 In some process applications, it is important that the control valve be able to completely stop fluid flow when placed...
Education 27.4 Valve packing adminFeb 3, 2020 Regardless of valve type, all stem-actuated control valves require some form of seal allowing motion of the stem from...
Education 27.3 Dampers and louvres adminFeb 3, 2020 A damper (otherwise known as a louvre) is a multi-element flow control device generally used to...
Education 27.2 Rotary-stem valves adminFeb 3, 2020 A different strategy for controlling the flow of fluid is to insert a rotary element into the flow path. Instead of...
Education Chapter 27 Basic Principles of Control Valves and Actuators adminFeb 3, 2020 One of the most common final control elements in industrial control systems is the control valve. A “control...