Page 70 - Valve Selection Handbook
P. 70
Manual Valves 57
Figure 3-14. Globe Valve, Three-Way, Used as Change-Over Valve in Pressure
Relief Valve Installations: One Pressure Relief Valve is Isolated While the Second One
Is in Service. (Courtesy of Bopp & Reuther GmbH.)
Valve Beatings
Globe valves may be provided with either metal seatings or soft seat-
ings. In the case of metal seatings, the seating stress must not only be
high but also circumferentially uniform to achieve the desired degree of
fluid tightness. These requirements have led to a number of seating
designs. The ones shown in Figure 3-15 are common variations.
Figure 3-15. Seating Configurations Frequently Employed in Globe Valves.
