Thrd/SW Valves toolbar: Thrd/SW Control 
Command line: CNTS/CNTT
Places a threaded or socket weld control valve in the X-Y plane.
last point
Starts the plain end of the valve at the last point of the previously-created component.
Length
Specifies the length of the component. This option is only available when you set the Variable Component Length Assignment rule to Show Options.
Middle
Places the valve at its center.