Constant pressure filling valve

Abstract

The invention discloses a constant pressure filling valve. The constant pressure filling valve comprises a valve body installed at a discharging port in the bottom of a liquid tank. A filling head isarranged at the bottom of the valve body. A liquid inlet channel is arranged in the valve body. A first sealing surface is formed in the liquid inlet channel. An exhaust channel is arranged inside thevalve body. A valve element is arranged in the liquid inlet channel. A first sealing plug is arranged at the lower end of the valve element. A gas return channel is arranged inside the valve element.A gas return pipe is arranged at the bottom of the valve element. A second sealing surface is formed in the gas return channel. A gas filling rod is arranged in the valve element. The lower end of the gas filling rod is provided with a second sealing plug. A gas storage cavity communicating with the gas return channel below the second sealing surface is further arranged inside the valve element.The gas storage cavity is located above the liquid level in the gas return channel of the valve element when filling is stopped and the exhaust channel is blocked. By means of the gas storage cavity,when filling is stopped and the exhaust channel is opened, after gas between the liquid level in the valve element and the second sealing surface is expanded, materials in the gas return channel of the valve element and the gas return pipe can be completed pressed out. The constant pressure filling valve has the advantage that the filling efficiency is high.

Description

technical field [0001] The invention relates to the technical field of liquid filling equipment, in particular to an equal pressure filling valve. Background technique [0002] Isobaric filling, also known as pressure gravity filling method, is a commonly used filling method: when filling, fill the bottle to be filled with a gas (such as: carbon dioxide) that is greater than atmospheric pressure, and at the same time There is also the same pressure, and the material flows into the bottle to be filled by its own weight. [0003] Isobaric filling valve is a key component of isobaric filling, such as figure 1 As shown, the structure of the isobaric filling valve currently used is: a valve body 2 installed at the outlet of the bottom of the liquid cylinder 1, and the lower space in the liquid cylinder 1 stores the filling liquid 3 (hereinafter referred to as "material") ), the upper space stores the back pressure gas 4 with a pressure greater than atmospheric pressure, a filli...

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Problems solved by technology

[0011] The disadvantage of the current isobaric filling valve is that after the filling is completed, there will be residual materials in the return air passage of the valve core and the return air pipe, and the residual materials must be blown out through the purging process, which not only wastes materials, but also The ejected material will also cause the presence of sugar in the environment, pollute the filling environment, and affect the filling efficiency; at the same time, it also wastes the back pressure gas and increases the production cost of the enterprise

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