Pressure relief valve
AssigneePrysmian Cables & Systems Limited
InventorsIan Griffiths, Paul Hubbard, Malcolm Jones
Life of this patent
Estimating the term…
Abstract
A pressure relief valve for blown fiber closures is provided having constituent components fabricated from plastic. An adaptor is provided for connection to a blown fiber closure, and a body welded to this adaptor, is provided to enclose a piston and a spring within, such that they are protected from the ingress of silt and water. The piston is arranged to provide a double seal such that a pressure relief valve plug and an opening in the enclosing body are closed or opened simultaneously to prevent the ingress of silt and/or water on the one hand and the unhindered escape of pressurized fluid on the other.
Claims13
A pressure release valve, comprising:
- a primary seal and a secondary seal, said primary and secondary seals surrounding an enclosure to be sealed, said secondary seal opening and closing together with the primary seal;
- an adaptor for connection to a blown fibre closure, said blown fibre closure being arranged at a first end of said adapter for connecting to a high pressure fluid source, said adaptor being provided at a second end thereof with a recess forming a valve seat;
- a piston adapted to be moveable between a first position in which the piston is arranged to block the valve seat and a second position in which the piston is arranged to unblock the valve seat, said piston being provided with a sealing plug;
- a spring adapted for urging the piston toward the first position;
- and
- a body enclosing the valve seat, spring and piston, said body being provided with an external opening, wherein the sealing plug is adapted to plug said external opening when the piston is in the first position and to unblock said external opening when the piston is in the second position,
- wherein the piston comprises a cylindrical spindle surrounded by elastomeric material shaped to form the valve plug and sealing plug.
Dependencies are inferred from the claim text.