Excess pressure safety relief valve

摘要

A liquid pressure control valve includes at least one 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 which junction controls a bleed passage between. The first component is threadingly engaged within the second component. The valve includes a chamber intended to contain liquid up to a required pressure during operation of the valve. The valve includes at least one annular impingement element mounted about a reduced diameter section, relative to the sealing section, of the first component and adjacent thereto with the impingement element. The impingement element includes 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 it will be compressed at least partly into the bore of the impingement element and away from the O ring's first sealing position to take up a second non-sealing position and, with release of the excess pressure, return to its first sealing position.

主权项

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.