Patent ID: 9194507
Filing Date: 2015-11-24
Classification: F16K,F16L,G05D,Y10T

Abstract:
1. A surge suppressing shutter valve used to vent air from a liquid filled pipeline, the surge suppressing shutter valve comprising an elastic shutter element deployed in a vent passageway extending from the pipeline, said elastic shutter element being pre-shaped to a normally open position and configured to gradually deform to a closed position as a velocity of air flowing through said vent passageway increases, so as to dampen the force of the closure and prevent a pressure surge within the pipeline, wherein said elastic shutter element is configured to progressively close said vent passageway such that said shutter valve provides a first stage of air venting in which increasing pressure difference across the shutter valve results in a first maximum flow rate through the shutter valve, and such that a further increase in pressure difference across the shutter valve brings said elastic shutter element to said closed position, resulting in a second stage of air venting having a lower flow rate than said first maximum flow rate, wherein said elastic shutter element is configured such that said pre-shaped normally open position includes a “U” shaped cross-sectional contour with reentrant extremities.