Patent ID: 7201187

Claim:
A valve comprising: a body defining an inlet, an outlet and a passage connecting the inlet with the outlet; a flexible diaphragm having a periphery secured to the body and a generally center portion; at least one depending rib extending from the flexible diaphragm about the center portion and toward the body; the diaphragm movable between a first position spaced from the body to promote flow from the inlet through the passage to the outlet and a second position wherein the center portion and the at least one rib contact the body to block flow through the passage; wherein the first position includes the at least one rib being spaced less from the body than the center portion to limit flow of at least some foreign particles exceeding a predetermined size depending on the spacing of the at least one rib from the body from flowing past the rib and becoming trapped between the center portion and the body; and wherein the body has a first portion for contacting the center portion and a second portion for contacting the at least one rib, the valve further comprising a second depending rib extending from the flexible diaphragm about the center portion and toward the second portion and being spaced radially outward from the at least one depending rib, the second rib being spaced from the second portion to promote flow through the passage while the diaphragm is in the first position, and wherein at least a portion of the second rib contacts the second portion of the body to block flow through the passage while the diaphragm is in the second position.