| 摘要 |
A non-chattering, float-controlled, pilot-operated diaphragm valve for controlling the flow of liquids from a conduit under pressure to a tank where the surface is in turbulent condition. The lightweight float and pilot valve follow the relatively high frequency fluctuations of level and the diaphragm valve responds causing a rapid opening and closing of the main flow through the conduit into the tank. The chattering is eliminated by the insertion of operative means between the float closure means and the movable diaphragm. A small diameter rod of selected length is positioned between the diaphragm and the closure means so that when the main flow through the conduit starts, the movement of the diaphragm away from the conduit forces the pilot valve to open and submerge the float to a considerable depth. While the float rises, the pilot valve remains open permitting the main flow to continue, and raising the level in the tank a substantial amount so that there is a continuing pressure on the float to maintain a closed pilot. This prevent the immediate reopening of the conduit and therefore, removes the rapid chattering action.
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