Page 96 - Valve Selection Handbook

Manual Valves 83

Efforts to overcome the alignment problem of plain wedges led to the
development of self-aligning wedges. Figure 3-41, Figure 3-42, and Fig-
ure 3-43 show typical examples. The simplest of these is the flexible
wedge shown in Figure 3-41 and Figure 3-42, which is composed of two

Figure 3-40. Seat of Wedge Gate Valve with PTFE Sealing
Insert. (Courtesy of Crane Co.)

Figure 3-41. Wedge Gate Valve with
Flexible Wedge, Pressure-Sealed
Bonnet, External Screw. (Courtesy of
Crane Co.)

Figure 3-42. Forged Wedge Gate Valve
with Pressure-Sealed Bonnet, Incorporating
Flexible Wedge with Hard Faced Grooves
Sliding on Machined Body Ribs. (Courtesy
of Veelan Engineering Ltd.)