| 摘要 |
<p>A valve actuator assembly (100), counter-biased by a working fluid (or gas) pressure, is disclosed. The valve actuator assembly (100) comprises a valve (200) and a pneumatic or hydraulic actuator (216). A port (210) is defined axially through the valve (200) and actuator (216) that communicates a working fluid (or gas) pressure acting on the valve face to a counter-biasing chamber (226,228) inside an actuator housing. This design eliminates, reduces, or overcomes a force acting on a face of the valve (212) by communicating a common working pressure of the fluid (or gas) to a substrate (220) on the actuator with a resultant force vector opposite the valve face (212).</p> |
