| 摘要 |
<p>The invention relates to a gate valve (20) with an integrated hydraulic actuator (30), of the type comprising a body or housing (2), with the body (3) of the hydraulic actuator (30) fixed to its upper end, for controlling the valve (20) by a stem (4) that slides axially in response to pressures within the chamber (B) of the piston of the actuator (30); the stem (4) has two metal backseats (10, 11), an upper one on the side of the actuator (30) and a lower one on the side of the valve (20); said backseats (10, 11) being adapted to seal against corresponding stem (4) guiding bushes (7A, 7B) which are located within the corresponding hole for receiving the body (3) of the actuator (30).</p> |
