Page 157 - Valve Selection Handbook

144 Valve Selection Handbook

3. Tilting-disc check valves. The closure member tilts about a hinge,
which is mounted near, but above, the center of the seat, as in the
valve shown in Figure 4-11.
4. Diaphragm check valves. The closure member consists of a
diaphragm, which deflects from or against the seat, as in the valves
shown in Figure 4-12 through Figure 4-14.

Figure 4-1. Lift Check Valve with Piston-Type Disc, Standard Pattern. (Courtesy of
Eaward Valves Inc.)

Figure 4-2. Lift Check Valve, Angle Pattern,
with Built-in Dashpot, Which Comes Into
Play During the Final Closing Movement.
(Courtesy of Sempell A.C.)