Safety valve of a high pressure storage, in particular a hydrogen storage tank
View Patent ↗A safety valve for a compressed gas storage tank ( 12 ) includes a relief conduit ( 16, 18 ) provided for fluid connection to an interior chamber ( 14 ) of the compressed gas storage tank ( 12 ), and a closing member ( 22 ) sealing the relief conduit ( 16, 18 ); a retaining device ( 24 ) being provided which, in a normal condition, locks the closing member ( 22 ) in place and which, in safety-critical conditions, opens a cross-sectional flow area ( 30 ) in such a manner that the relief conduit ( 16, 18 ) is open to the atmosphere. In accordance with the present invention, the closing member ( 22 ) is connected to an adjustor ( 26 ) which adjusts the cross-sectional flow area ( 30 ) of the relief conduit ( 16, 18 ) as a function of an upstream interior pressure.
1. A safety valve for a compressed gas storage tank comprising:
a relief conduit for fluid connection to an interior chamber of a compressed gas storage tank and having a cross-sectional flow area in safety-critical conditions;
a closing member sealing the relief conduit;
a retaining device, the retaining device in a normal condition locking the closing member in place and, in safety-critical conditions, opening the relief conduit to the atmosphere, and
an adjustor connected to the closing member and located in a fluid flow path within the relief conduit for adjusting the cross-sectional flow area as a function of an upstream interior pressure; and
a stop inside the relief conduit capable of providing a defined minimum cross-section area of the cross-sectional flow area in which gas can flow in safety-critical conditions.
2. The safety valve as recited in claim 1 wherein the stop includes a porous material.
3. The safety valve as recited in claim 2 wherein the porous material is a mesh, a foam, or a perforated plate.