Patent ID: 8002247

Claim:
A container and valve-crosspurge assembly for storing and dispensing high purity process chemical, comprising; (A) a container for containing a high purity process chemical having an inlet and an outlet for dispensing high purity process chemical and introducing a carrier gas to assist in dispensing the high purity process chemical; (B) a valve-crosspurge fitting comprising; (i) a first valve; and, (ii) a second valve, one of such valves connected to the inlet of the container and the other of such valves connected to the outlet of such container; and, (iii) a crosspurge connection between the first and second valves that provides fluid flow connection between the two valves separately from the container; wherein, each valve has; (a) a first orifice to the container; (b) a second orifice to a conduit for fluid flow connection outside the assembly; and, (c) a third orifice to the crosspurge connection axially displaced a first distance from the second orifice in the valve; (d) a valve housing; and, (e) a valve stem capable of moving in the valve housing to one of two positions: (1) container open and (2) crosspurge open-container closed; wherein, the valve stem has three valve sealing surfaces: (I) a first valve sealing surface configured to seal against a first valve seat to close the first orifice to the container; (II) a second valve sealing surface of enlarged cross-section, relative to a primary valve stem cross-section, configured to seal against an inside wall of the valve housing to close the second orifice to the first orifice; and, (III) a third valve sealing surface of enlarged cross-section, relative to the primary valve stem cross-section, configured to seal against the inside wall of the valve housing to form with the second valve sealing surface a flow passage between the third orifice of the crosspurge connection and the second orifice, wherein the axial spacing of the second valve sealing surface from the third valve sealing surface on the valve stem is at least as great as the first distance, recited in (c) so as to form the flow passage, recited in (III).