Specification bulletins typically include dimensional drawings (see Figure 37) and tables that list face-to-face (or end-to-end) and other critical dimensions.

Several standards organizations issue and maintain standards for face-to-face and end-to-end dimensions of control valves. (Face-to-face dimensions are listed for flanged valve bodies, while end-to-end…

Threaded-end connections (see Figure 36) are popular for small control valves because of their economy and ease of installation. Threaded end connections are generally not…

In many high pressure and high temperature applications, the valve body is welded directly into the pipeline. Welded end connections (see Figure 35) are leak-tight…

A wafer-style valve body (see Figure 34) includes a raised-face contact surface in the body casting. The faces conform to standard raised-face flange dimensions, and…

Separable Flange – The separable flange (see Figure 33) is another variation of a raised-face flange. In this construction, the flange is manufactured independently of…

End connections provide the means for installation of control valves in pipelines. Popular end connections include several types of screwed pipe threads, bolted and gasketed…

The previous discussions of gasket and packing material selection underscore the importance of the temperature ratings of all the control valve components. The temperature limits…

Basic Packing Selection Considerations – The general rule for packing material selection that is suggested by most valve manufacturers is as follows: • If the…

Adjustable Belleville Spring Operation – During installation, the Belleville springs are compressed until the indicator disk aligns with the maximum (MAX) compression line on the…