CPC F16K 31/002 (2013.01) [F16K 1/48 (2013.01); F16K 17/383 (2013.01); F16K 27/02 (2013.01)] | 18 Claims |
1. A slam shut valve assembly, comprising:
a dual-diaphragm subassembly comprising an upper diaphragm and a lower diaphragm; and
a spacer comprising a threaded hole;
a threaded thermal screw device comprising a thermal fuse installed in said threaded hole of said spacer;
wherein the slam shut valve assembly is configured to shut off the gas flow: (i) when a sensing pressure applied underneath the lower diaphragm of the dual-diaphragm subassembly exceeds a predetermined pressure threshold, and (ii) when product temperature exceeds a predetermined temperature threshold that is a function of a melting point of the thermal fuse causing the thermal fuse to rupture and allow communication of the sensing pressure past the thermal fuse to an area underneath the upper diaphragm.
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