Check valve plate with anti-pressure surge device
AssigneeGoodwin International Limited
InventorRichard Stanley Goodwin
Life of this patent
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Abstract
An ant-pressure surge device mounted in or on a closure member (1) of a check valve to eliminate overpressure and reduce shock waves in a pipeline when the check valve closes. The anti-pressure surge device comprises a fast acting flow relieving valve having a flow path sufficient in the open position to relieve the reverse flow on closure of the check valve closure member and is designed to open when the back pressure shock wave on the downstream side of the valve approaches a predetermined value. A suitable anti-pressure surge device comprises a poppet comprising a piston portion (7) and a sealing element (7A) moveable by the back pressure shock wave against resilient disk springs (10).
Claims22
An anti-pressure surge device mounted in or on a closure member of a check valve to permit flow in the upstream direction the check valve is supposed to prevent when subject to a back pressure shock wave on the downstream side of the valve, the device comprising a fast acting flow relieving valve having flow paths sufficient in the open position to relieve at least 5% of the reverse flow on closure of said check valve closure member.
A check valve comprising at least one anti-pressure surge device mounted in or on a closure member of said check valve to permit flow in the upstream direction the check valve is supposed to prevent when subject to a back pressure shock wave on the downstream side of the valve wherein the aggregate flow path cross section in the open position of the at least one anti-pressure surge device is between 2% and 20% of the flow path cross section in the open position of the check valve.
A pipeline comprising at least one anti-pressure surge device mounted in or on a closure member of a check valve to permit flow in the upstream direction the check valve is supposed to prevent when subject to a back pressure shock wave on the downstream side of the valve the anti-pressure surge device opens to permit flow in the upstream direction when the pressure differential between the downstream and upstream side of the check valve exceeds by a predetermined percentage the maximum stagnant flow pressure on the downstream side of the check valve.
A pipeline comprising at least one check valve comprising at least one anti-pressure surge device mounted in or on a closure member of said check valve to permit flow in the upstream direction the check valve is supposed to prevent when subject to a back pressure shock wave on the downstream side of the valve wherein the aggregate flow path cross section in the open position of the anti-pressure surge devices is between 2% and 20% of the flow path cross section in the open position of the check valve.
Dependencies are inferred from the claim text.