Throat retention apparatus for hot gas applications
A nozzle for use in a hot gas valve is provided that includes a housing, an insert, and a throat retainer. The housing is constructed of an insulating material and has a flow path formed therein. The flow path has a throat section. The insert is made of material capable of maintaining structural integrity at a temperature up to about 5000° F. and is disposed at least partially in the throat section and has a flow path extending therethrough in fluid communication with the housing flow path. The throat retainer is constructed of material having insulating and ablative properties and is coupled between the housing and the insert and configured to retain the insert within the housing throat section.
1. A nozzle for use in a hot gas valve, the nozzle comprising:
a housing comprising an insulating material, the housing having a flow path formed therein that includes a throat section;
a throat retainer comprising material having insulating and ablative properties, the throat retainer disposed at least partially within the housing throat section and coupled to the housing; and
an insert comprising material capable of maintaining structural integrity at a temperature up to about 5000° F. the insert disposed at least partially within the housing throat section and having an outer surface, an inlet end, an outlet end, and a flow path extending between the inlet and outlet ends in fluid communication with the housing flow path, the outer surface and the inlet end defining a flange therebetween that is at least partially retained between the housing and the throat retainer.
2. The nozzle of claim 1 , wherein:
the housing further comprises a cylindrical section and a divergent section coupled to one another by the throat section, the cylindrical section having a cross sectional flow area; and
the divergent section has an inlet and an outlet, the inlet having a cross section flow area greater than the cylindrical section cross sectional flow area.
3. The nozzle of claim 1 , wherein the throat retainer further comprises an inlet end, an outlet end, and a passage extending therebetween, the passage in fluid communication with the housing flaw path and the inlet end configured to couple to the insert outer surface.
4. The nozzle of claim 1 , further comprising an adhesive layer between the housing and the throat retainer.
5. The nozzle of claim 4 , wherein the throat is configured to expand and insulate the adhesive layer from heat.
6. The nozzle of claim 1 , wherein the housing material comprises phenolic.
7. The nozzle of claim 1 , wherein the throat retainer material comprises phenolic.
8. The nozzle of claim 1 , wherein the housing material and throat retainer material comprise the same material.
9. The nozzle of claim 1 , wherein the housing material and throat retainer material comprise different material.
10. The nozzle of claim 1 , wherein the insert material comprises at least one of a refractory material, and alloys including more than one refractory, ceramic or ceramic/metallic hybrid material.
11. The nozzle of claim 10 , wherein the refractory material comprises at least one of tungsten, rhenium, molybdenum, niobium, tantalum, and titanium.
12. The nozzle of claim 1 , wherein the insert material comprises ceramic.