Earthquake safety valve
Patent
·
OSTI ID:6350562
This patent describes a shock sensitive self-closing safety valve for a gas pipeline. It comprises: a valve body of a non-magnetic material having inlet and outlet flow passageways with an annular, generally horizontal valve seat between them; a valve element of a magnetic material above the valve seat; a permanent magnet in the shape of a valve stem in the valve body above the valve element and movable therein toward and away from the valve element to engage and suspend same above the valve seat; spring means biasing the magnet away from the valve element; and a spacer gap of a non-magnetic material secured to the bottom of the magnet to establish the magnetic gap between the magnet and the valve element with the valve element to enable horizontal movement of the valve element while suspended by the magnet.
- Assignee:
- NOV; EDB-91-000979; NOV-90-043114
- Patent Number(s):
- A; US 4960146
- Application Number:
- PPN: US s 7-514762
- OSTI ID:
- 6350562
- Country of Publication:
- United States
- Language:
- English
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