| 摘要 |
A test fixture for EGR valves has a support with a flat upper surface with a well opening through it spaced from the boundaries of the upper surface. A conduit, open at two ends, communicates with the atmosphere at one end and with the well intermediate its ends. A venturi tube communicates with the other end of the conduit. The venturi tube has a throat portion and an aspirating line communicating at one end with the throat portion of the venturi tube and at the other with a vacuum fitting for connection to the vacuum fitting of an EGR valve resting on the flat upper surface of the fixture. A pressure fitting is connected to the venturi tube to accommodate a complementary fitting from a source of gas under pressure. The venturi tube and conduit are dimensioned and arranged to deliver a vacuum to the vacuum fitting and a pressure to the well of a magnitude at which the EGR valve will operate normally if the EGR valve is in operating condition.
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