Cage-Guided Valves – In a cage-guided valve, the flow characteristic is determined by the shape of the cage windows, or openings. Figure 41 illustrates the…

The flow characteristic of a control valve is defined as the relationship between the flow coefficient and valve travel as the valve travels from 0…

The rated Cv of a particular style can be included in the basic liquid flow equation to calculate flow (Q). When the flow rate and…

The relative flow capacity of a control valve is indicated by its flow coefficient. The flow coefficient Cv refers to the number of U.S. gallons…

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…