| 摘要 |
<p>This invention relates to fillers and filler valves for filling open top containers with liquids or liquid bearing materials. The filler valve of the invention is particularly useful for filling containers with carbonated or other gas containing beverages, such as beer or the like. The valve has four major elements comprising a cylinder having a filling port, a foot valve, a piston having a charging port and a plug valve. The valves are piston-type elements and cooperate with cylindrical seating surfaces formed at their respective ports. The foot and plug valves are provided with resilient seals for seating with the aforesaid cylindrical seating surfaces. At the conclusion of the filling operation, the foot valve is raised from its open position into engagement with the plug valve while the latter is sealed with the charging port. The foot valve is then raised to lift the plug valve until the foot valve seals off the filling port while the plug valve remains seated. This traps gas at atmospheric pressure between the seals. The foot valve is raised an additional amount until the plug valve breaks its seal with the charging port of the piston while the seal between the foot valve and the cylinder filling port is maintained. Thus, the gas that was trapped at atmospheric pressure is readily displaced as liquid from the measuring chamber flows down into the space between the seals. In order to enlarge the measuring chamber slightly, when it is filled with carbonated beverage, to bring the pressure in the chamber to substantially atmospheric pressure, the foot valve is lowered slightly along its cylindrical seat, thereby reducing the pressure in the measuring chamber before initiation of a filling operation.</p> |
