Invention Grant
US08398050B2 Hold open configuration for safety valve and method 有权
保持安全阀的配置和方法

Hold open configuration for safety valve and method
Abstract:
An actuator and counterbalance system including a nonmobile carrier; a mobile carrier, mobile relative to the non mobile carrier; and a counterbalance system in operable communication with the mobile carrier and configured to counterbalance less than 100 percent of a return force of a tool actuated by the actuator and method.
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