Flowserve Swing Check Valves 2.5-24 - Manual (Page 8)

Swing Check Valves FCD ADENIM0013-00
7
1.0 VALVE DESCRIPTION
(Continued)
1.3.2
Disc Assembly
The disc assembly (Fig. 4) consists of a flat faced disc tapering back to an integral disc pin. The
threaded pin (and disc), loosely mounted in a hole in the bottom of the hinge arm, is held in place by a
heavy nut that is drilled and pinned. The flexible disc-hinge connection permits the disc to completely
contact the seat even if there is minor seat face movement. The hinge arm rotates about the hinge pin
and has a stop on its tail below the disc pin hole. The stop contacts the body in the fully open position
and prevents damaging impact forces from reaching the disc.
Three methods of supporting the hinge pin in the body have been used. Where shaft penetration of the
body is acceptable (Fig. 5) or desirable, the pin is supported in journals that are integrally cast in the
body neck above the seat ring. One journal is drilled through the body wall to permit insertion of the
pin. In this design, the body penetration is sealed by a spiral wound gasket and a blind flange.
Figure 4
Figure 5