| 摘要 |
<p>PCT No. PCT/FI94/00045 Sec. 371 Date Dec. 30, 1994 Sec. 102(e) Date Dec. 30, 1994 PCT Filed Jan. 31, 1994 PCT Pub. No. WO94/16772 PCT Pub. Date Aug. 4, 1994A valve for a fire fighting installation has an inlet into a valve body for connection to a primary source of a first liquid under a first pressure, a liquid space in the valve body for connection to a secondary source of a second liquid under a second pressure, an outlet from the valve body for connection to an out-going line for the first and second liquids, and a connection from the inlet to the outlet and a movable spindle in the valve body for closing the connection with one end of the spindle when the spindle is in a stand-by position and opening the connection when the spindle is in an activated position. An opposite end of the spindle is in the liquid space for the second pressure of the second liquid to urge the spindle toward the stand-by position, the spindle having a shoulder for pressing by the first pressure of the first liquid to urge the spindle toward the activated position, the relative areas of the shoulder and opposite end of the spindle being such that the first pressure can be higher than the second pressure for the second pressure still to urge the spindle sufficiently to hold the spindle in the stand-by position against the urging of the first pressure. A channel extends through the spindle from the one end to the opposite end of the spindle for supplying the second liquid to the outlet even when the connection is closed.</p> |
