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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. [1]
A control valve is a valve used to control fluid flow by varying the size of the flow passage as directed by a signal from a controller. [1] This enables the direct control of flow rate and the consequential control of process quantities such as pressure , temperature , and liquid level.
Clicky/Tactile/Linear Click Leaf 40/75 g 32/58 g 73/95 g 2.0 mm (unchecked) 4.0 mm Plate Mounting No Yes N/A Zeal PC Gateron Crystal MX Type Stem Tactile N/A ...
A linear actuator opens and closes valves that can be operated via linear force, the type sometimes called a "rising stem" valve. These types of valves include globe valves, rising stem ball valves, control valves and gate valves. [2] The two main types of linear actuators are diaphragm and piston.
Gate valve, mainly for on–off control, with low pressure drop; Globe valve, good for regulating flow. Uses a cylinder movement over a seat; Knife valve, similar to a gate valve, but usually more compact. Often used for slurries or powders on–off control; Needle valve for accurate flow control; Pinch valve, for slurry flow regulation and ...
Linear Grey; Tactile, non-clicky Purple; Ergo Clear; Brown; Clear; Tactile Grey; Tactile, Clicky. Blue; White; Green; Cherry MX Grey switches can be found in linear (which provides a smooth, consistent feel sans feedback), [20] tactile, and clicky variants. They are distinguished by stem color, with linear being darker than tactile. The clicky ...
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A non-linear valve, for instance, in a flow control application, will result in variable loop sensitivity, requiring dampened action to prevent instability. One solution is the use of the valve's non-linear characteristic in the control algorithm to compensate for this.