US 11,988,299 B2
Slam shut thermally triggered valve
Chuang Ji, Columbiana, OH (US)
Assigned to BELLOFRAM CORPORATION, Newell, WV (US)
Filed by Bellofram Corporation, Newell, WV (US)
Filed on Dec. 17, 2021, as Appl. No. 17/554,114.
Claims priority of provisional application 63/199,290, filed on Dec. 18, 2020.
Prior Publication US 2022/0196174 A1, Jun. 23, 2022
Int. Cl. F16K 31/00 (2006.01); F16K 1/48 (2006.01); F16K 17/38 (2006.01); F16K 27/02 (2006.01)
CPC F16K 31/002 (2013.01) [F16K 1/48 (2013.01); F16K 17/383 (2013.01); F16K 27/02 (2013.01)] 18 Claims
OG exemplary drawing
 
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.