| 摘要 |
<p>An improved hydraulic valve for a camera dolly includes a valve pin having an extension within a valve housing to reduce vibration and noise and to reduce hydraulic closing forces. The valve pin is resiliently supported by e.g., rubber o-rings at both ends. Valve performance is improved as reducing hydraulic forces on the valve pin results in smooth valve operation, especially when opening the valve under heavy loading.</p> |
