| 摘要 |
<p>The valve includes a sleeve having a water inlet and a water outlet. There is a stem movable within the sleeve, to control the flow of water from the inlet to the outlet. A pressure piston is positioned within the sleeve and coaxially arranged with the stem. The pressure piston is fixed relative to the sleeve and is within the path of flow from the sleeve inlet to the sleeve outlet. A fixed seal is positioned between the stem and the pressure. A seal of equal diameter, is carried by the stem and is in sealing engagement with the sleeve.</p> |
