Combination Valve Assembly
A combination valve assembly is adapted to being an interface for filling and relieving excess pressure from a closed fluid system such as a propane tank, and to enable the regulation of fluid height within the closed fluid system via a dip tube and a bleeder set screw. The system generally comprises a pin valve element, an insert shell element, a main housing element, a relief system, and a dip tube member in fluid communication with an overfill port in the main housing. The dip tube member may be adapted to extend outward of the distal end of the man housing element.
1 . A combination valve assembly adapted to being mounted in a port in a pressure tank, the combination valve assembly comprising:
a pin valve element including a pin valve body and a piston member, the piston member being adapted to be slidably retained within the pin valve body, the pin valve element having an open configuration and a closed configuration, the pin valve element being elastically biased toward its closed configuration, the elastic bias being overcome responsive to a predetermined level of mechanical force axially applied to the piston member;
an insert shell element having an inner bore extending therethrough, the inner bore being adapted to threadedly receive the pin valve body;
a main housing element having a main bore adapted to receivingly engage the insert shell element so as to form an annular relief chamber, the main housing element having a proximal end, a distal end and a relief port therebetween, the relief port being adapted to be in fluid communication between the annular relief chamber and the ambient environment; and
a relief valve system having a relief configuration, a sealed configuration, the distal end being adapted to being in fluid communication with the annular relief chamber when the relief valve system is in its relief configuration, the relief valve system being resiliently biased toward its sealed configuration, the resilient bias being overcome responsive to a predetermined pressure at the distal end.
2 . A combination valve assembly as defined in claim 1 in which the relief port extends generally radially outwardly of the main bore.
3 . A combination valve assembly as defined in claim 1 in which the main housing member further has an overfill channel and an overfill port, the overfill channel being in fluid communication between the distal end and the overfill port, the overfill port being adapted to be in fluid communication between the overfill channel and the ambient environment.
4 . A combination valve assembly as defined in claim 3 in which the main housing element includes an outer surface, and the overfill port extends through the outer surface.
5 . A combination valve assembly as defined in claim 3 in which the overfill port is adapted to threadedly engage a bleeder set screw.
6 . A combination valve assembly as defined in claim 3 in which the relief port and the overfill port are at approximately the same axial position along the main housing member.
7 . A combination valve assembly as defined in claim 3 in which the overfill channel is adapted to engage a dip tube member such that the dip tube member extends generally outward of the distal end.