Safety valve
AssigneeLind Finance & Development AB
InventorBjörn Lind
Life of this patent
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Abstract
In a method for a safety valve plus such a safety valve, the safety valve has the form of a valve body axially displaceable in a cavity with an inlet on either side of which are arranged outlets, whereby liquid and/or gas flow takes place from the inlet and past the valve body via a flow path to the outlets. On the valve body side, the flow path is provided with a structure that raises the friction in relation to the liquid and/or gas flow between the inlet and outlets.
Claims32
A method for a safety valve comprising the steps of:
- (a) providing a housing defining a cavity with an inlet on either side of which are arranged outlets;
- (b) providing a valve body displaceable in the cavity;
- (c) providing a surface with such a structure in relation a fluid flow through the housing that the valve body is forced by friction force from the fluid flow acting thereon primarily to be displaced towards one of the outlets before a force due to a pressure drop over the inlet and the one outlet is secondarily brought to seal the one outlet during a break in a pipe connected thereto;
- and
- (d) providing the fluid flow from the inlet via a flow path passing through the housing to the outlets.
The method for a safety valve comprising the steps of:
- (a) providing a housing defining a cavity with two inlets and an outlet arranged therebetween;
- (b) providing a valve body displaceable in a cavity;
- (c) providing a surface with such a structure in relation to a fluid flow through the housing that the valve body is forced by friction force from the fluid flow acting thereon primarily to be displaced towards one of the inlets before a force due to a pressure drop over the inlets is secondarily brought to seal the one inlet during a break in a pipe connected thereto;
- and
- (d) providing the fluid flow from the inlets via a flow path passing through the housing to the outlet.
A safety valve comprising:
- (a) a housing defining a cavity with an inlet on either side of which are arranged outlets;
- (b) a valve body displaceable in the cavity whereby a fluid flow can take place from the inlet via a flow path passing through the housing by the valve body to the outlets;
- and
- (c) a surface with a structure in relation to the flow path adjacent the valve body for increasing friction so that friction force of the fluid flow acting on the valve body initially is greater than a force due to a pressure drop over the inlet and one of the outlets during a break in a pipe connected to the one of the outlets.
A safety valve comprising:
- (a) a housing defining a cavity with two inlets and an outlet arranged between them;
- (b) a valve body displaceable in the cavity whereby a fluid flow takes place from the inlets via a flow path passing through the housing by the valve body to the outlet;
- and
- (c) a surface with a structure in relation to the flow path adjacent the valve body for increasing friction so that friction force of the fluid flow acting on the valve body initially is greater than a force due to a pressure drop over the inlets during a break in a pipe connected to one of the inlets.
Dependencies are inferred from the claim text.