| 摘要 |
This present invention pertains to a flap valve particularly used with and in chemical pumps. This valve is spring-biased to and toward a port formed in a wall of the pump. The valve includes a laminate structure at the hinge area which provides alternate Teflon and corrosion resistant, bright sheet stainless steel riveted together with front and back facing portions also of Telfon. The laminated portion has extending portions of each laminate member and in each of these portions are formed elongated apertures that are aligned to provide vertically elongated slotted holes sized to slide on the shanks of studs mounted in the wall of the pump. The extending portion of the laminate is mounted with front and back spacer members so that the laminate portion is spaced from the wall about the extent of the front facing portion. The laminated extending portion with the elongated apertures, when mounted on the studs, allows a sliding association of one member to an adjacent member so that as the valve is swung inwardly from the wall to permit fluid flow the metal members, although slightly displaced, urge the flap valve assembly toward and to a closing condition when the fluid pressure is reduced or absent.
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