| 摘要 |
A shear fitting for coupling a downstream vertical conduit to an upstream vertical conduit in, for example, an underground suction-type fuel delivery system, includes a hollow body defining a fluid flow passage between an inlet in an upstream body portion and an outlet in a downstream body portion. The upstream body portion is configured to be removably coupled to the upstream conduit, and the downstream body portion is configured to be removably coupled to the downstream conduit. The body has a peripheral shear groove defining a frangible annular wall portion that fractures in response to a shear force of more than a predetermined magnitude. A test port extends from the flow passage to the exterior of the body, the port being sealed by a removable closure. Removal of the closure results in a loss of prime in a suction-type fuel delivery system only if there is no check valve in the conduit upstream from the shear fitting, thereby allowing verification of the absence of such a check valve.
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