Patent ID: 9353883
Filing Date: 2016-05-31
CPC Classification: F16K,Y10T

Claim Text:
1. A liquid pressure control valve for pressure relief, including an O-ring seal mounted, in a first sealing position, on a sealing section of a first component thereof to seal a junction between that first component and a second component, the junction forming part of a bleed passage extending through a region of actual threaded engagement between a first component thread of the first component and a second component thread of the second component, wherein when the first component thread and the second component thread are threadably engaged they combine to define an outer perimeter of at least a portion of the bleed passage extending therebetween, a chamber to contain liquid up to a required pressure during operation of the liquid pressure control valve, an impingement element mounted about and adjacent to a reduced diameter section, relative to the sealing section, of the first component, and the impingement element including a bore that tapers away from the O-ring seal, whereby with a pressure in excess of the required pressure acting on the O-ring seal, the O-ring seal will be compressed at least partly into the bore of the impingement element and away from its first sealing position to take up a second non-sealing position in which the liquid pressure control valve is configured to allow liquid through the bleed passage, the liquid pressure control valve is configured such that after the release of the excess pressure the O-ring seal returns to the first sealing position in which the O-ring seal blocks the bleed passage.