By definition, a valve is a device that takes control of the pressure and the flow of fluid within a process. It does this job by doing several tasks. It stops and starts the fluid flow, varies its amount, controls its direction, regulates downstream system or process pressure, and relieves the component. These functions can be performed through different valve designs and types.
But in order for them to become successful in performing those tasks, the parts of a valve assembly must work well together. No matter what type of control valve it is, typically, it contains the basic parts such as the actuator, the body, bonnet, trim, and packing. All these components are categorized into two main parts. These are the actuator part and the body part for easier understanding.
The Actuator Part
Valve controls can be classified as hydraulic, motorized, and pneumatic. For this valve assembly part, it is also composed of various components, each of which performs its specific role in the entire control process. These include the rain cap, eye bolt, diaphragm, spring, actuator stem, diaphragm case, scale plate, stem connector, and the yoke.
The Body Part
This second major part of the valve assembly has some part that is often included in the bonnet valve. It is the exposed portion that directly comes in contact with the fluid. In other cases, the body of the valve is hailed as the shell. It works as the principal element of the whole assembly as it is the framework that holds the rest of the components. The body part can be made into various shapes. It can be shaped into a cylinder or a sphere, which are the two most common options due to its economical shape.
Lastly, while actuator and body parts are the two most primary components, other considerations you need to keep in mind are the costs, manufacturing, and final assembly. Your final decision would be dictated by the specific application you have for the valve.
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