Safety valve
AssigneeLind Finance & Development AB
InventorBjorn Lind
Life of this patent
Estimating the term…
Abstract
A method for a safety valve plus such a safety valve. The safety valve has the form of a valve body (6) axially displaceable in a cavity (2) with an inlet (3; 4) on either side of which are arranged outlets (4; 3), whereby liquid and/or gas flow takes place from the inlet and past the valve body (6) via a flow path to the outlet. The invention is distinguished in that on the valve body side, the flow path is provided with a surface (14, 15) that raises the friction in relation to the liquid and/or gas flow between the inlet and outlet.
Claims12
A method for a safety valve in the form of a valve body (6) displaceable in a cavity (2) with an inlet (3) on either side of which are arranged outlets (4), whereby liquid and/or gas flow takes place from the inlet via a flow path passing through the valve body (6) to the outlets characterised in that on the valve body side, the flow path is provided with a surface with such a structure in relation to the liquid and/or gas flow that the valve body (6) is forced by the force of friction from the liquid and/or gas flow acting on it primarily to be displaced towards an outlet (4) before the force, due to a pressure drop over the inlet and outlet is secondarily brought to seal the outlet during a break in a pipe connected to it.
A method for a safety valve in the form of a valve body (6) displaceable in a cavity (2) with an two inlets (4) and an outlet (3) arranged between them, whereby liquid and/or gas flow takes place from the respective inlet (4) via a flow path passing through the valve body (6) to the outlet (3) characterised in that on the valve body side, the flow path is provided with a surface with such a structure in relation to the liquid and/or gas flow that the valve body (6) is forced by the force of friction from the liquid and/or gas flow acting on it primarily to be displaced towards an inlet (4) before the force, due to a pressure drop over the inlets (4), is secondarily brought to seal the said inlet during a break in a pipe connected to it.
A safety valve in the form of a valve body (6) displaceable in a cavity (2) with an inlet (3) on either side of which are arranged outlets (4), whereby liquid and/or gas flow takes place from the inlet via a flow path passing through the valve body (6) to the outlet characterised in that the flow path on the valve body side is provided with a structure that increases friction so that the friction force of the liquid and/or gas flow acting on the valve body (6) initially dominates the force due to a pressure drop over the inlet (3) and outlet (4) during a break in a pipe connected to the outlets (4).
A safety valve in the form of a valve body (6) displaceable in a cavity (2) with an two inlets (4) and an outlet (3) arranged between them, whereby liquid and/or gas flow takes place from the respective inlet (4) via a flow path passing through the valve body (6) to the outlet (3) characterised in that the flow path on the valve body side is provided with a structure that increases friction so that the friction force of the liquid and/or gas flow acting on the valve body (6) initially dominates the force due to a pressure drop over the inlets (4) during a break in a pipe connected to one of the inlets.
The safety valve according to any of the previous claims characterised in that at at least one end of the valve body (6), there exists a space (12) separated from the cavity (2) and provided with a restricted connection with the cavity (2).
The safety valve according to any of the previous claims characterised in that the surface that increases friction has the form of transverse furrows (14).
Dependencies are inferred from the claim text.