Opening and closing device for auxiliary path port in antiexcess overflow valve unit
JPS55166574A
Device for dropping out ball valve pressed upon valve seat of overflow preventing valve housed in gas tube joint by inductive action of permanent magnet
JPS55152975A
Improvement of cylinder for overflow preventive valve device
JPS55139571A
Device for separating ball valve from valve seat of excessive outflow prevention valve unit in cock by turning open/close handle to open said ball valve and restore it into reusable state
JPS5583516A
Cutting method of sub-route port and fastening projection in anti-overflow valve to cut them in one stroke
JPS5655767A
Valve dropping device which resets to initial state for reuse by dropping spherical valve due to air pressure difference of which valve seat is closed by operation of excessive effluence preventing valve
JPS5563076A
Full opening-closing device of plug cock which automatically full opens and closes plug hole by turning handle of plug cock
