A dispensing valve is provided for being sealingly disposed with respect to, and dispensing a product from, a discharge opening of a container. The preferred form of the valve includes a generally annular marginal portion adapted to be sealingly engaged when the valve is sealingly disposed with respect...http://www.google.com.au/patents/US6530504?utm_source=gb-gplus-sharePatent US6530504 - Multiple orifice valve
