Valve parts refer to the components used in the construction and operation of valves, which are mechanical devices designed to control the flow of fluids (liquids, gases, or slurries) within a system by opening, closing, or partially obstructing passageways.

Some common valve parts include:

Body:

The main casing or housing of the valve, which contains the internal components and provides the connection points for piping or tubing.

Bonnet:

The cover or top portion of the valve body that houses the stem and other internal components. It is typically bolted or screwed onto the body to provide a seal and access for maintenance.

Seat:

The sealing surface inside the valve body against which the movable element (such as a disc, ball, or plug) comes into contact to shut off the flow of fluid.

Disc, Ball, or Plug:

The movable element that controls the flow of fluid by either blocking or allowing passage through the valve. These elements are often designed with specific shapes and materials to optimize performance and sealing.

Stem:

The rod or shaft that connects the actuator (such as a handle, lever, or actuator motor) to the movable element, allowing the operator to open or close the valve.

Trim:

The internal components of the valve, including the disc, seat, stem, and any additional parts designed to control flow characteristics, such as flow rate, pressure drop, or erosion resistance.

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