Bimetal valve with integral fuse
A bimetal valve has a valve seat movable intermediate a closed and open configuration relative to a port. An arm is connected to the valve seat having at least a bimetal portion. An electric heater selectively applies heat to the bimetal portion to transition the valve from closed to open, with many embodiments being biased in the closed configuration. A built-in fuse is provided in series with the heater between first and second electrical connections providing an electric supply to the electric heater.
1. A valve comprising:
a valve seat connected to an arm;
a port, said valve seat moved by the arm intermediate a closed configuration and an open configuration, wherein when in said closed configuration, the valve seat contacts the port preventing fluid flow through the port, and when in the open configuration, the valve seat is at least partially displaced from the port thereby permitting the flow of fluid through the port;
the arm having at least a bimetal portion;
a heater selectively applying heat to the bimetal portion;
first and second terminals selectively receiving an electrical voltage from an electrical source in communication with the heater when installed; and
a built-in fuse intermediate the first and second terminals, in series with the heater, whereby if current exceeds a predetermined value for a predetermined time, built-in the fuse creates an electrical open between the first and second terminals preventing further heat application from the heater.
2. The valve of claim 1 wherein the built-in fuse is a fusible link.
3. The valve of claim 2 wherein the fusible link is a Nichrome member having a predetermined cross sectional area designed to separate at a predetermined electrical condition maintained for a predetermined time.
4. The valve of claim 1 wherein the arm is cantileveredly mounted to extend from a base, said base spaced apart from the port.
5. The valve of claim 4 wherein the base is connected to a mount.
6. The valve of claim 5 wherein the arm extends parallel to the mount.
7. The valve of claim 4 wherein the first and second terminals extend oppositely relative to the base on the mount.
8. The valve of claim 4 wherein the first second terminals connect respectively to an anode and a cathode extending through the base.
9. The valve of claim 8 wherein the built-in fuse connects to one of the anode and the cathode at a first end and the heater at a second end.
10. The valve of claim 8 wherein the fuse is a fusible link.
11. The valve of claim 10 wherein the fusible link is a Nichrome member having a predetermined cross sectional area designed to separate at a predetermined electrical condition maintained for a predetermined time.
12. The valve of claim 4 wherein the arm extends perpendicularly from the base.
13. The valve of claim 5 further comprising a gas connection connected to a gas supply, said gas connection in communication with the port.
14. The valve of claim 13 wherein the gas connection is oppositely disposed form the port relative to the mount.
15. The valve of claim 4 wherein the bimetal portion of the arm connects to the base.
16. The valve of claim 15 wherein the bimetal portion of the arm connects to an extension, said the extension connects to the valve seat.
17. The valve of claim 1 wherein the heater is an electrical resistance heater.
18. The valve of claim 17 where in the electrical resistance heater has an insulator thereabout.
19. The valve of claim 18 wherein the insulator is a fiberglass sheath, and the electrical resistance heater is wrapped about the bimetal portion.
20. The valve of claim 1 wherein the valve seat is normally biased in the closed configuration.