| 摘要 |
<p>An apparatus is provided for a valve actuator assembly (16) comprising an actuator housing (32), a piston (34), and a spring (36). The piston (34) is disposed within the actuator housing (32). The piston (34) is configured to couple to a valve element (14), and includes an inner cylindrical section (46) and an outer cylindrical section (48). The outer cylindrical section (48) of the piston (34) is spaced apart from the inner cylindrical section (46) to define a recess (50). The piston (34) is further configured to move within the actuator housing (32) in a first direction and a second direction, to thereby move the valve element (14) toward a first position and a second position, respectively. The spring (36) is disposed within the actuator housing (32), and is configured to supply a bias force that urges the piston (34) to move in the first direction. The spring (36) is at least partially disposed within the recess (50), and at least partially surrounding the inner cylindrical section (46).
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