Eccentric Rotary Plug Control Valve

The MaxFlo 4 eccentric rotary plug control valve
Image courtesy of Flowserve Valtek

There is an extensive array of valves from which to select for a process control operation. Each candidate valve is targeted by its designers for a range of fluid applications, fortified with construction materials and design features specifically suited for meeting the challenges of that application range.

Flowserve, under their Valtek brand, developed a control valve that combines a number of useful design features. The MaxFlo 4 is an eccentric rotary plug valve intended for fluid control operations. The valve has some attractive design features.

• There is no shaft extending through the flow path, leaving flow unobstructed when the valve is fully open (see the illustration in the document included below).
• Valve trim provides tight bi-directional shutoff.
• Metal or soft seat construction is available to accommodate a wide range of applications.
• A variant provides flange to flange dimensions that allow the MaxFlo 4 to drop in as a replacement for standard size globe valves.
• High Cv rating may enable use of a smaller valve, when compared to other designs.
• Precise position control is delivered by the shaft form and plug mounting.
• Double offset eccentric plug eliminates sliding of plug across sealing surfaces, reducing wear and required seal maintenance.

More detailed information is provided in the document provided below. There is a revealing cutaway illustration showing the mounting and movement path of the plug. Share your industrial process control valve requirements and challenges with a valve selection and automation specialist to get the best match of control valve to application.

Eccentric Rotary Plug Control Valve from CTi Controltech

Introduction to Valve Parts or Components

Various types of industrial valves
(courtesy of Flowserve)

Industrial valves come in many shapes and sizes and they are classified according to different functions they have. Regardless of type, all valves have the following basic parts or components, the body, bonnet, trim, seat, stem, actuator, and packing.

Valve Body

The valve body is the primary boundary, housing or container. It serves as the main element of a valve assembly. It is the framework that holds all the parts together.

The body contains the fluid pressure loads from the inlet and outlet piping. The body connects to the piping via through threaded, flanged, or welded joints.