A servo valve has a heatsink housing with a plurality of external fins. The heatsink housing contains an electromagnet arrangement and a valve arrangement. The electromagnet arrangement has a magnet assembly, a coil assembly, pole pieces, and an armature acted upon by flux generated by the electroma
A servo valve has a heatsink housing with a plurality of external fins. The heatsink housing contains an electromagnet arrangement and a valve arrangement. The electromagnet arrangement has a magnet assembly, a coil assembly, pole pieces, and an armature acted upon by flux generated by the electromagnet. A conductive support member connects the coil assembly to the heatsink housing. The valve arrangement has a valve member driven by the armature to control flow between an inlet port and an outlet port. The valve arrangement is positioned in the heatsink housing on an opposite side of a seal plate from the electromagnet arrangement. The support member holds the coil assembly spaced from the seal plate and in a thermally conductive path to the heatsink housing.
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1. A servo valve, comprising: a heatsink housing having a plurality of external fins and defining an internal chamber;an electromagnet arrangement disposed within the internal chamber and generating a flux field, the electromagnet arrangement having a magnet assembly, a coil assembly with a wire coi
1. A servo valve, comprising: a heatsink housing having a plurality of external fins and defining an internal chamber;an electromagnet arrangement disposed within the internal chamber and generating a flux field, the electromagnet arrangement having a magnet assembly, a coil assembly with a wire coil wound about a bobbin, and an armature acted upon by the flux field;a seal plate disposed within the internal chamber;a conductive support member directly connecting the bobbin of the coil assembly to the heatsink housing; anda valve arrangement disposed within the internal chamber at a side of the seal plate opposite the electromagnet arrangement and having a valve member driven by the armature to control flow between an inlet port and an outlet portwherein the coil assembly is held by the support member in an axially spaced relation with respect to the seal plate. 2. The servo valve of claim 1, wherein the valve arrangement has a lower thermal conductivity than the support member. 3. The servo valve of claim 1, wherein the support member extends from the bobbin and connects to the heatsink housing by mechanical fasteners. 4. The servo valve of claim 3, wherein the bobbin creates a thermal conduction path from the wire coil to the heatsink housing via the support member. 5. The servo valve of claim 4, wherein the bobbin is aluminum. 6. The servo valve of claim 1, wherein the plurality of fins of the heatsink housing define a plurality of emissive surfaces at ninety degrees to one another providing unobstructed thermal emission to ambient. 7. The servo valve of claim 1, wherein the electromagnet arrangement includes a shell in which the magnet assembly is mounted. 8. The servo valve of claim 7, wherein the shell has a hollow cylindrical body extending axially between first and second ends having radially inward extending surfaces, at least the first end having multiple circumferentially spaced radially inward extending surfaces. 9. The servo valve of claim 1, wherein the valve member interfaces with a valve seat defined by a base disposed at an end of the heatsink housing opposite to where the support member connects. 10. The servo valve of claim 9, wherein a majority of flow occurs along a flow path that extends only at the interface between the valve member and the valve seat. 11. The servo valve of claim 1, wherein the valve member is a clevis. 12. The servo valve of claim 11, wherein the valve arrangement includes a flexure pivot in which the clevis is mounted; wherein the electromagnet arrangement drives the armature to pivot the clevis about the flexure pivot to open the inlet port to the outlet port. 13. The servo valve of claim 12, wherein the clevis defines a metering edge on each side of a flow channel within the clevis which forms a part of a flow path between the inlet port and the outlet port. 14. A servo valve, comprising: a heatsink housing having a plurality of external fins and defining an internal chamber;an electromagnet arrangement disposed within the internal chamber and generating a flux field, the electromagnet arrangement having a magnet assembly, a coil assembly with a wire coil wound about a bobbin, and an armature acted upon by the flux field;a seal plate disposed within the internal;a valve arrangement disposed within the internal chamber at a side of the seal plate opposite the electromagnet arrangement and having a valve member driven by the armature to control flow between an inlet port and an outlet port; anda support member directly connecting the bobbin of the coil assembly to the heatsink housing to hold the bobbin in an axially spaced relation with respect to the seal plate. 15. The servo valve of claim 14, wherein the support member extends from the bobbin and the bobbin creates a thermal conduction path from the wire coil to the heatsink housing via the support member. 16. The servo valve of claim 14, wherein the valve member interfaces with a valve seat defined by a base disposed at an end of the heatsink housing opposite to where the support member connects; and wherein a majority of flow occurs along a flow path that extends only at the interface between the valve member and the valve seat. 17. A servo valve, comprising: a heatsink housing having a plurality of external fins and defining an internal chamber;an electromagnet arrangement disposed within the internal chamber and generating a flux field, the electromagnet arrangement having a magnet assembly, a coil assembly with a wire coil wound about a bobbin, and an armature acted upon by the flux field;a seal plate disposed within the internal chamber;a conductive support member directly connecting the bobbin of the coil assembly to the heatsink housing; anda valve arrangement disposed within the internal chamber and having a valve member driven by the armature to control flow between an inlet port and an outlet port at an interface between the valve member and a valve seat defined by a base disposed at an end of the heatsink housing opposite to where the support member connects, wherein the valve member is configured to contain a majority of the flow at the interface between the valve member and the valve seat;wherein the coil assembly is held by the support member in an axially spaced relation with respect to the seal plate. 18. The servo valve of claim 17, wherein the support member extends from the bobbin and the bobbin creates a thermal conduction path from the wire coil to the heatsink housing via the support member. 19. The servo valve of claim 17, wherein the valve arrangement has a lower thermal conductivity than the support member.
Ganzer Charles P. (Cumming GA) Hubbard Timothy M. (Canton GA) Osinaiya Taiwo T. (Stone Mountain GA) Ruse Paula E. (Norcross GA) Walsh John T. (Duluth GA), Apparatus for dispensing heated fluid materials.
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