A method of producing a valve includes the steps of: providing a mold comprising a pair of mating mold halves, with each of the mold halves including a mold cavity; providing a valve member-stem unit comprising a valve member of substantially circular cross-section attached to a stem, with the valve...http://www.google.com/patents/US6260820?utm_source=gb-gplus-sharePatent US6260820 - Valve with rotatable valve member and method for forming same
