Inflatable stopping bags
AssigneeCrane Co.
InventorAndrew Welfare
Life of this patent
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Abstract
A method of controlling the fluid pressure of an inflatable stopping bag used to block the fluid flow through a fluid conduit comprises pressurising the bag using a pressure regulator which operates to regulate the pressure of the bag as a function of the instantaneous pressure in the pipe upstream of the stopping bag.
Claims16
A method of controlling the fluid pressure of an inflatable stopping bag used to block the fluid flow through a fluid conduit, the method comprising:
- pressurising the bag upon a pressure regulator which operates to regulate the pressure of the bag as a function of the instantaneous pressure in the pipe upstream of the stopping bag;
- wherein:
- the pressure of the fluid in the pipe upstream of the stopping bag is transmitted to the pressure regulator, the pressure providing the force required to pressurize the stopping bag.
Apparatus for regulating the pressure in an inflatable stopping bag for use in blocking a fluid conduit, the apparatus comprising a pressure regulator which automatically regulates the pressure in the stopping bag when in use in response to the instantaneous pressure within the fluid conduit upstream of the stopping bag, and means for transmiting the pressure of the fluid in the pipe upstream of the stopping bag to the pressure regulator, said transmitted pressure providing the force required to pressurise the stopping bag.
Dependencies are inferred from the claim text.