| 摘要 |
The invention refers to improvement of construction at overground and underground Fire Hydrants. Solutions are shown:
- how to dislocate the screw part of the gate valve and the bearing of axial forces of the gate valve, out of water current,
- bearings of axial forces of the gate valve by rolling bearings,
- activation of Hydrant without additional tools, by direct hands acting on hydrant cap,
- mechanical blockade against an unauthorized activating,
- mechanical limitations of the position of gate valve when the water flow is biggest,
- problem of the level of water lagging behind and sur-pressure in the hydrant body, when the hydrant is closed,
- drainage valve which is activated by the effect of water pressure, being independent of any part of the gate valve. |
