Importance

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Abstract

A flush fire protection sprinkler has a body with an outlet for delivering fire protection fluid under pressure. The body defines a seat about the outlet and a coaxial rim with an inner lip. A spring seal engages upon the seat. A thermal response assembly includes a plate with a conical rim having slots extending from the rim edge, a retainer having a hub and fingers terminating in fingertips defining engagement structure, the fingers engaging in the slots with the fingertips outside the rim, a thermal response element between the plate and hub, and a loading element mounted to the hub. Initial adjustment of the loading element draws the hub away from the plate, with the rim surface urging the fingertips outward, to engage with the lip. Further adjustment pressures the seal in sealing engagement upon the seat. The thermal response element, in a fire condition, actuates, and fire protection fluid flow urges the plate away from the outlet, permitting the fingers to contract inward, disengaging from the lip, and the thermal response assembly disengages from the body and moves away from the outlet.

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First Claim