Pressure relief valve

摘要

Described herein is an improved externally mounted pressure relief valve that is especially adapted for rail tank cars or other large closed containers that contain or transport fluids, including liquids and gases. The pressure relief valve comprises a plurality of spring assemblies, and each spring assembly contains a pre-determined number of spring leaves. Each spring assembly is coiled upon a corresponding spring drum, and each spring drum is penetrated by a corresponding spring drum bolt. The spring assemblies are preferably aligned in at least two horizontal planes that are parallel to each other and normal to the vertical length of a spring block. The spring block and sealing disk are mounted vertically over the valve seat and within the confines of vertically extending spring brackets.

主权项

1. A pressure relief valve comprising constant force spring assemblies, a sealing disc, and a single adjustment screw,
said pressure relief valve further comprising a single integral one component spring block, said single spring block comprising a single larger upper integral solid polyhedral segment and a single smaller integral solid polyhedral lower segment, said single larger upper integral solid polyhedral segment being larger than said single smaller integral solid polyhedral lower segment, said single upper integral solid polyhedral segment being vertically aligned with said single smaller integral solid polyhedral lower segment, said spring block comprising a first plurality of aligned apertures along a first horizontal plane through said single larger upper integral solid polyhedral segment, and a second plurality of said aligned apertures being aligned along a second horizontal plane through said single lower smaller integral solid polyhedral lower segment, and said first horizontal plane and said second horizontal planes being in spaced vertical alignment with each other, said pressure relief valve further comprising only a first spring bracket and a second spring bracket, said pressure relief valve further comprising a first spring bracket brace bar and said second spring bracket brace bar, said first spring bracket brace bar and said second spring bracket brace bar each mechanically attaching said first spring bracket to said second spring bracket.