| 摘要 |
A flap valve 30 includes a core assembled from a stack of discs 36, 38, 40, secured together by screws 50 and having therein openings (42, Fig. 1) which cooperate to form a pair of ducts through the core. The disc 38 is formed with recesses to retain projections (56, Fig. 4) on valve members 54 which are pivotable between a position in which the ducts through the core are open and a position in which the ducts are closed. The valve may be used as a non-return valve in a system for cooling food products and which incorporates pipework through which cooling water is made to flow. |
