Drop Cut-off

Form of valve-gear for producing an abrupt stop of the admi ion of steam to an engine-cylinder, by releasing the admi ion valve so that it closes by gravity. The Corli and Sickles cut-offs are of this type. The valve is pushed open by the suitable rod, but at the proper time a latch is tripped by which the valve is released from connection with the rod, and a weight or spring shuts the valve quickly, while the rod completes its slower stroke. DASH POTS (q.v.) are usually provided for valves of this type.