THERMALLY ACTIVATED PRESSURE RELIEF VALVE

摘要

The thermally activated pressure relief valve (10) has a piston (14) normally retained in a closed position and being movable to an open position in case the valve (10) is exposed to an abnormally high temperature. An elastic slotted spring sleeve (20) is disposed within a sleeve (18) of fusible material. In a non-activated state the fusible sleeve (18) maintains the spring sleeve (20) in a radially compressed condition wherein it has a smaller inner diameter effective to retain the piston (14) in the closed position. When the fusible sleeve (18) melts the spring sleeve (20) radially expands to a larger diameter permitting movement of the piston to the open position wherein it is partly received in the spring sleeve (20) .