| 摘要 |
<p>619186 A liquid pressure control valve includes at least one O-ring seal (11) mounted, in a first sealing position, on a sealing section of a first component thereof to seal a junction between that first component (16) and a second component (1b) which junction controls a bleed passage (9) 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 (20) 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 (as shown). With release of the excess pressure the O-ring returns to its first sealing position. In the second non-sealing position the fluid is released through an entrance (21), up through the bleed passage (9) formed by the interstice gap of the threaded connection, and out through the exit aperture (22), thereby relieving the excess pressure.</p> |
