Though many granular or pelleted products can be effectively filled into valve bags, the largest use of&#;valve bags have centered around powdered products or mixes including powders. Because the opening of a valve bag is much smaller than that of an open mouth bag, the flow of the powdered product can be better controlled.
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The earliest advantage of valve bags was that they were self-closing and reduced the labor required to fill and close (hand sew) the open mouth sacks of the day.
Despite many innovations in the valve design including film lock and double trap, the self-closing feature is far from a hermetic seal. For this reason, many of the bags used in the chemical and food industry are ultrasonically sealed after filling.
Other advantages of the valve bag include a more tightly filled bag and a squarer bag that will often make a better stack on the pallet (in comparison to other bag forms like open mouth and form-fill-seal).
Here are some of the key advantages of using valve bag filling equipment:
- Precise and consistent filling
- Reduce risk of contamination
- Bag integrity
- Efficient packaging
- Dust control
- Versatility
- Reduced material waste
- Consistent bag appearance
- Quick changeover
- Quality assurance
- Increased productivity
- Remote monitoring and control
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Overall, valve packers provide a cost-effective and efficient solution for packaging dry bulk materials while offering numerous advantages related to accuracy, cleanliness, versatility, and productivity.
The sanitary requirements of the process will govern the surface finishes and other sanitary options. We define our finishes as follows:
No surface finish (Ra) specified. Sometimes referred to as &#;mill finish&#; or &#;as cast&#;. Fabricated valves will only have the internal welds ground smooth and flush. Common in general industrial applications where cross contamination or cleanability are not a concern.
#2 finish &#; Ra 33 to 65 microinch &#; 150 to 180 grit. Also referred to as &#;buffed, blended or uniform appearance finish&#;. Often specified for the outside of equipment that will be washed down.
#4 polish &#; Ra 16 to 32 microinch &#; 180 to 240 grit. All fabrication and handling marks removed. Surface is buffed to a uniform satin finish. The #4 polish is typical for the interior of equipment that needs to be cleaned between batches to prevent cross contamination.
#7 polish &#; Ra 10 to 15 microinch &#; 240 to 320 grit. All surface imperfections are repaired. Often referred to as &#;pit free&#; and &#;mirror finish&#;. Used for high purity applications such as processing potent pharmaceutical actives. Also used for products that tend to adhere to surfaces.
For automatic cleaning, spray balls or jets should be considered. Another option is a valve that can be dismantled by hand for inspection and cleaning. For safety reasons the size of such valves are typically limited to an 8&#; port diameter due to the weight of individual components.
Contact us to discuss your requirements of stainless steel valve pump body casting export. Our experienced sales team can help you identify the options that best suit your needs.
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