Plastic lined diaphragm valve

An improved plastic lined diaphragm valve, the diaphragm valve comprising a body portion, the body portion having a first end and a second end, the passageway extending from said first end to said second end, the body portion defining a weir, the weir extending in a direction generally perpendicular to a longitudinal axis of the passageway, the body defining an intermediate opening at a location generally opposite the weir;

• about the opening opposite the weir a bonnet receiving surface, the bonnet receiving surface being of annular configuration, a plastic lining disposed within the body, the lining extending out of said body and covering at least a portion of the bonnet receiving surface, a bonnet assembly affixed to the bonnet receiving surface;
• the improvement which comprises the bonnet receiving surface of the body defining at least a first and second recess, said first and second recesses being generally diametrically opposed, and generally adjacent the weir with the further limitation that the plastic lining extends into said recesses.