| 摘要 |
A pressure relief valve which will move to a fully open position as soon as a predetermined pressure is established within a vessel in which the valve is mounted. The valve comprises a housing mountable in the vessel with its inner end opening inwardly of the vessel and its outer end opening outwardly of the vessel. A pressure relief passage opens through the housing and a valve member is slidably mounted with respect to the housing for movement between a first position closing the pressure relief passage and a second position in which the pressure relief passage is open to permit full flow through the pressure relief passage. Locking means is provided for releasably interlocking the valve member and the housing to retain the valve member in its first position. Pressure responsive lock release means is mounted on the valve and movable in response to an increase in pressure above a predetermined minimum pressure to release the lock means to free the valve member and thereby permit the valve member to move to the full flow first position without requiring any increase in pressure in the vessel above the predetermined pressure.
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