| 摘要 |
A diaphragm valve suitable for use as filling nozzle cut-off valve in the container filling industry. The valve includes a valve head (18) having a operational surface (62) provided with a centrally located shallow recessed portion (64) and an air hole (68) extending to the recessed portion. The valve further includes a valve body (16) having a smooth surface disposed in alignment with the operational surface of the valve head, inlet and outlet ports (24, 26, respectively), and spaced apart inlet and outlet passageways (36, 38, respectively) extending respectively from the inlet and outlet ports to inlet and outlet passageway openings (36a, 38a, respectively) in the area of the smooth surface opposite the recessed portion of the valve head, the inlet and outlet passageway openings being arranged in two columns symmetrical with the center of the smooth surface. The valve further includes a diaphragm (20) disposed between the valve head and the valve body, the diaphragm extending across both the recessed portion of the valve head and the passageway openings in the smooth surface. Screws 86 are provided to hold the part together with the diaphragm sandwiched between the operational surface of the valve head and the smooth surface of the valve body.
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