The valve actuator is widely used in machinery for food, packaging, petrochemical, metallurgy, painting, vehicles, printing and dyeing, etc. Features: The valve actuator adopts a lightweight design, with an exquisite appearance, compact structure and excellent performance.

The filling valve is a on-off valve that precisely and quantitatively controls the flow rate. The valve actuator is widely used in machinery for food, packaging, petrochemical, metallurgy, painting, vehicles, printing and dyeing, etc. Features: The valve actuator adopts a lightweight design, with an exquisite appearance, compact structure and excellent performance.

There are not many major domestic manufacturers of filling valves. Filling valves are renowned for their fast filling speed, convenience, flexibility, precision and stability.

I. General Steps for Filling Valve Design

1. Draft a structural plan

Determine the number of valves in the valve body

According to the selected filling method and its corresponding technological process. Determine the number of valves required and their relative positions among the liquid chamber, gas chamber and container. For the structure of the pre-vacuuming valve (pre-vacuuming means first extracting about 90% of the original air in the bottle to be filled - and then filling with other gases for isobaric filling). In addition to setting up one liquid valve, three gas valves are also required. That is, a valve used for inflation and return air is located close to the air chamber of the liquid storage tank. One valve for pre-vacuuming and one valve for pressure relief are both located near the valve end and connected to the neck.

For the structure of the three-chamber long tube threshold, in addition to setting up one liquid valve, three valves also need to be set up. That is, a valve for inflation and a valve for accelerating exhaust and achieving rapid filling. A valve for pressure relief, all of which should be located close to the valve end and connected to the neck.

(2) Determine the structural layout of the valve body

According to the opening and closing form of the valve, determine the structural layout of the movable and immovable components of the valve body, as well as the sealing form between the surfaces that are in relative motion.

In comparison, the movable wide, especially the flat sealing structure, is easier to achieve a tight spring seal. Due to the large cross-section of the flow channel, few bends, and relatively simple structural shape of the parts, it is conducive to increasing the filling speed and is also convenient for cleaning. However, it has a relatively large number of parts, and once the sealing spring fails. Filling would be difficult to carry out. The rotary valve has a small number of parts and a certain degree of reliability. However, it is difficult to ensure that broken bottles will not be filled, especially with a sealing structure that uses a sealing surface. Once the sealing material is worn, it cannot be compensated and has to be replaced, which is prone to leakage. Therefore, it is not widely used.

(3) Determine the structural layout of the valve end

According to the process requirements of the filled liquid, the valve end structure of the long pipe or the short pipe can be determined. The central tube of the long tube structure is inserted close to the bottom of the bottle for liquid intake, such as a three-chamber long tube valve. The central pipe of the short pipe structure is inserted into the bottleneck position for inflation or exhaust, such as a pre-vacuum valve. In addition, to ensure quantitative accuracy and stable outflow, etc., it is also necessary to rationally layout certain structural elements at the valve end. As shown in Figure 4-35, the valve end structure of the short pipe structure features an adjustable threaded connection between the return gas pipe 19 and the liquid valve 5. The liquid valve formed between the rubber gasket 21 at the bottom of the valve and the valve seat 8 is as close as possible to the valve end. It helps to improve the quantitative accuracy. During filling, the dispersion hood 20 of the air pipe is precisely located at the point where the liquid material enters the bottleneck. Above the diversion ring, an inverted conical annular gap is adopted, and the valve seat is in a concave ring shape. This can prevent the liquid gate from being deflated when opened.

(4) Structural forms of opening and closing valves

The opening and closing structure of a valve should be appropriately selected based on its position in the valve body and the mode of its opening and closing movement. 2. Calculate the basic parameters of the flow channel

Based on the initially determined structural dimensions, accurately calculate the flow velocity at the outlet interface of the filling valve to form a stable laminar flow as much as possible. Based on this, the required filling time is obtained. Then, considering the main shaft speed of the filling machine and the Angle occupied by the filling area, the designed valve is checked and corrected. Make it conform to the given production capacity. Only when these requirements are met can the structural dimensions of the filling valve be finally determined. Draw the blueprint.