Pressure relief valve for pressurized furnace
AssigneePrimetals Technologies Austria GmbH
InventorsBernard GILL, Gareth KAPS
Life of this patent
Estimating the term…
Abstract
A pressure relief valve system has a fluid outlet (1) from a pressure vessel; a flexible expansion piece (4) at an end of the fluid outlet remote from the pressure vessel; a primary pressure relief valve has a valve seat and a valve lid (7). The valve seat has a flange (5) mounted on the expansion piece and the valve lid forms a valve seal with the flange. A fluid off-take (13) is connected to the fluid outlet (1) and a secondary pressure relief valve (11) receives fluid from the fluid off-take. The secondary pressure relief valve has an outlet (12) coupled to a valve opening actuator (15), whereby passage of fluid through the secondary pressure relief valve (11) causes the opening actuator to operate to open the valve lid (7).
Claims14
A pressure relief valve system for a pressure vessel, the system comprising:
- a pressure vessel;
- a fluid outlet from the pressure vessel;
- a flexible expansion piece at an end of the fluid outlet remote from the pressure vessel;
- a primary pressure relief valve comprising a valve seat and a valve lid, the valve seat comprising a flange mounted on the flexible expansion piece;
- and the valve lid is configured to form a valve seal with the flange;
- and
- a fluid off-take connected to the fluid outlet;
- a secondary pressure relief valve to receive fluid from the fluid off-take;
- the secondary pressure relief valve further comprising an outlet coupled to a valve opening actuator, whereby passage of fluid through the secondary pressure relief valve causes the valve opening actuator to operate to open the valve lid.
A system according to any preceding claim, wherein the lid is coupled to the opening actuator by an over-center linkage and the linkage being for selectively moving the lid to form the valve seal or to open the lid after the over-center linkage passes over-center.
A method of relieving pressure in a pressurized vessel, wherein the vessel comprises a fluid outlet and at least one primary pressure relief valve comprising a valve seat and a valve lid;
- and
- the method comprising supplying fluid from the fluid outlet to a secondary pressure relief valve;
- detecting pressure of the fluid in the secondary pressure relief valve;
- when the detected pressure exceeds a predetermined threshold, opening the secondary pressure relief valve to permit the passage of the fluid to a valve opening actuator, for causing a valve opening cylinder to move an operating lever, and an over-center linkage coupled between the operating lever and the valve lid, such that the valve lid opens upon a movement of the operating lever.
Dependencies are inferred from the claim text.