Heat-sensitive cut-off for gas conduits and the like, and method of manufacture
Patent
·
OSTI ID:5200510
This patent describes an improvement in a heat sensitive cut-off for blocking flow through z gas conduit or the like. It is of the type comprising: first and second cut-off members disposed in the conduit which co-operate to block flow through the conduit when they are brought together, the first cut-off member having a socket therein; means for biasing the cut-off members together; a spacer between the first and second cut-off members for separating the cut-off members to permit flow through the conduit, the spacer having a portion penetrating partway into the socket in the first cut-off member; and a plug of a relatively low melting point material in the bottom portion of the socket for temporarily preventing the spacer from penetrating further into the socket, the socket and the spacer being configured so that when the plug melts the spacer can penetrate further into the socket sufficiently to allow the biasing means to move the cut-off members together to block the flow through the conduit. The improvement comprises means for preventing the spacer from separating from the first cut-off member the first cut-off member being positioned in the conduit upstream relative to the second cut-off member.
- Assignee:
- NOV; NOV-91-015385; EDB-91-150656
- Patent Number(s):
- A; US 4974623
- Application Number:
- PPN: US 7-479859
- OSTI ID:
- 5200510
- Country of Publication:
- United States
- Language:
- English
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