Page 67 - Valve Selection Handbook

54 Valve Selection Handbook

Figure 3-7. Globe Valve, Oblique
Pattern, Screwed-in and Seal-Welded
Bonnet, External Screw, Plug Disc, with
Domed Diaphragm Stem Seal and Figure 3-8. Globe Valve, Angle Pattern,
Auxiliary Compression Packing for Bolted Bonnet, External Screw, Plug Disc
Nuclear Application. (Courtesy of with V-Port Skirt for Sensitive Throttling
Edward Valves Inc.)
Control. (Courtesy of Crane Co.)

and Figure 3-8; and the oblique pattern, as in the valves shown in Figure
3-7 and Figure 3-10, Figure 3-12 and Figure 3-13.
The standard-pattern valve body is the most common one, but offers
by its tortuous flow passage the highest resistance to flow of the patterns
available.
If the valve is to be mounted near a pipe bend, the angle-pattern valve
body offers two advantages. First, the angle-pattern body has a greatly
reduced flow resistance compared to the standard-pattern body. Second, the
angle-pattern body reduces the number of pipe joints and saves a pipe elbow.
The oblique pattern globe-valve body is designed to reduce the flow
resistance of the valve to a minimum. This is particularly well achieved in
the valve shown in Figure 3-10. This valve combines low flow resistance
for on-off duty with the robustness of globe-valve seatings.