| 摘要 |
The inventive locking-releasing head is designed for pumped powder fire extinguishers which eject a fire extinguishing powder at a positive pressure and can be used as primary fire extinguishing means for fighting fires of class A (solid substances), class B (liquid substances) and class C (gaseous substances), fires of electrical installations when at voltage of up to 1000 V as well as fires at road, railway and river transport. Said locking-releasing head for a powder fire extinguisher comprises a body ( 1 ) provided with elements for fixing to the container of said fire extinguisher, a handle connected to the body ( 1 ), a locking unit provided with a rod ( 16 ) carrying a valve fixed thereto, a control lever ( 13 ), a siphon tube ( 21 ), a pressure indicator ( 2 ) and a spraying nozzle ( 19 ). Said pressure indicator ( 2 ) is arranged on the valve rod ( 16 ) in which rod ( 16 ) a hole is provided to communicate the under-membrane cavity of the indicator with the under-valve cavity of the head. The inventive structural design ensures high technical and economic characteristics, keeps pressure for a long time and makes it possible to carry out an impulse operation mode.
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