Document Type and Number:
Japanese Patent JPH023884
Kind Code:
B2
Abstract:
A safety device for gas welding is provided between a gas supply source and a burner torch to prevent counter-flow and back-fire from the burner torch in the direction of the gas supply source, and further, to positively cut off the flow path, so that explosion of the gas supply source is prevented. The gas welding safety device comprises a socket-side coupling providing a flow path, a plug-side coupling separably connected with the socket-side coupling and having a flow path communicating with the flow path of the socket-side coupling, and a mechanical mechanism for separably connecting both couplings. Within the flow path of the socket-side coupling, a movable valve seat confining a movable valve body for cutting off the normal gas flow are incorporated. The valve body has a valve seat portion and in turn houses a check valve for preventing dangerous counter-flow. If counter-flow pressure is generated, the check valve actuates and prevents the counter-flow and the counter-flow pressure also actuates the movable valve seat, which in turn actuates the mechanical mechanism, automatically physically separating both couplings.
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Inventors:
ABE TSUTOMU
Application Number:
JP26502785A
Publication Date:
January 25, 1990
Filing Date:
November 27, 1985
Export Citation:
Assignee:
SANKI KOGYO JUGENGAISHA
International Classes:
F23D14/82; A62C2/04; B23K37/00; F16L37/23; F16L37/35; F17C13/12
Next Patent: JPH023885