Method and apparatus for detecting seal failure

F - Mech Eng,Light,Heat,Weapons – 16 – J

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F16J 15/18 (2006.01) F16J 1/08 (2006.01) F16J 15/32 (2006.01) F16J 15/56 (2006.01) F16N 29/00 (2006.01) G01M 3/28 (2006.01)

Patent

CA 2423506

Pumps and valves with movable parts, such as a plunger, typically have seals around the part. The seals may isolate one chamber from another to prevent leakage across the seals. The pressure in one chamber may be different from the pressure in another adjacent chamber, thereby creating a pressure differential across the seal. When the seal is working properly, the pressures in the adjacent chambers remain constant approximately. However, when a seal leaks, pressure will leak across the seal. As such, the chamber with the lower pressure will show an increase in pressure due to seal leakage. Thus, monitoring pressure changes in the chamber with low pressure, or pressure differentials between chambers, serves as an indicator for leakage across the seal and impending seal failure.

L'invention concerne des pompes et des clapets comportant des parties mobiles, comme un piston, qui possèdent généralement des joints d'étanchéité autour de la pièce. Les joints d'étanchéité peuvent isoler une chambre d'une autre pour empêcher la fuite à travers les joints d'étanchéité. Il se peut que la pression dans une chambre diffère de celle d'une autre cuve adjacente, créant ainsi une différence de pression à travers le joint d'étanchéité. Lorsque le joint d'étanchéité fonctionne adéquatement, les pressions dans les chambres adjacentes demeurent plus ou moins constantes. Toutefois, en cas de fuite au joint d'étanchéité, il y aura une fuite de pression à travers le joint d'étanchéité. Ainsi, la chambre ayant une pression inférieure connaîtra une augmentation de la pression en raison du suintement statique. Par conséquent, la surveillance des changements de pression dans la cuve à faible pression, ou des différences de pression entre les chambres, sert d'indicateur pour repérer tout suintement statique et toute défaillance imminente du joint d'étanchéité.

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