发明名称 Fail-safe closure system for remotely operable valve actuator
摘要 <p>A fail-safe closure system for one or a plurality of springless process valve actuators is disclosed. An accumulator is provided with an urging means, such as a spring for pressurizing fluid stored therein. A source of pressurized fluid is also provided. Supply pressurized fluid is applied to an opening chamber of one or a plurality of process valve actuators while a flow path is opened to a vent from the closing chamber of the one or more actuators. For closing the actuator or actuators, a flow path is established by which pressurized fluid from the accumulator is applied to the closing chamber of the actuator or actuators while the opening chamber is vented. Control valves are arranged so that if or when they fail, they fail in a position which allows the process valve actuators to close as described.</p>
申请公布号 AU734396(B2) 申请公布日期 2001.06.14
申请号 AU19980083848 申请日期 1998.07.01
申请人 FMC CORPORATION 发明人 CHRISTOPHER E. CUNNINGHAM
分类号 E21B34/10;F15B20/00;(IPC1-7):F16K31/12 主分类号 E21B34/10
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