| http://www.w3.org/ns/prov#value | - ownwardly; means for abuttingly connecting said second cylinder to said valve-actuator sleeve, whereby upon failure of said first cylinder to move said valve-actuator sleeve downwardly, pressured fluid supplied to said second cylinder through said second fluid conduit will shift said valve-actuator sleeve downwardly to open said valve closure member; and latching means including a collet having a
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