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In chemical, pharmaceutical, food, lithium battery, and fine chemical production, one persistent challenge often limits centrifuge efficiency:
Residual filter cake left inside the basket after discharge.
Even a small amount of remaining solids can lead to:
To address these challenges, many manufacturers are turning to PGD Bag-Shaking Bottom Discharge Scraper Centrifuges, an advanced automatic centrifuge designed to achieve more complete cake discharge while improving filter cloth regeneration.
This guide answers the most common questions about PGD centrifuges and helps determine whether they are the right solution for your separation process.
A PGD centrifuge is an automatic vertical scraper centrifuge equipped with an additional pneumatic bag-shaking system.
Like conventional automatic scraper centrifuges, it performs:
However, the key difference is what happens after normal scraper discharge.
Once the scraper removes most of the filter cake, the integrated pneumatic bag-shaking device repeatedly moves the filter cloth up and down, dislodging residual solids that would otherwise remain attached to the filter medium.
This enables:
Many production facilities underestimate the impact of residual solids.
In pharmaceutical and specialty chemical production, even a small amount of leftover material may contaminate subsequent batches.
Residual solids gradually clog the filter cloth, increasing filtration resistance and reducing productivity.
Operators often need to stop production and manually clean the basket.
Incomplete discharge accelerates wear on filtration components and increases labor requirements.
For high-value products, these issues can significantly increase operating costs.
The separation process follows several stages:
The suspension enters the rotating basket through the feed pipe.
Under centrifugal force:
Wash liquid is introduced to remove impurities from the cake.
The basket continues rotating at high speed to reduce moisture content.
The scraper removes most of the filter cake from the basket wall.
The filter cloth is pulled and released repeatedly by a pneumatic system.
This motion breaks loose residual solids attached to the cloth surface.
The result is:
The most significant advantage is the secondary discharge mechanism.
Traditional scraper centrifuges rely entirely on the scraper blade.
PGD centrifuges add:
This additional discharge stage helps remove residual solids that scrapers cannot reach.
The shaking action helps restore filtration performance without manual intervention.
Less manual cleaning means higher equipment utilization.
More complete discharge reduces contamination risks.
For facilities handling sticky, crystalline, or difficult-to-discharge materials, these advantages can significantly improve production efficiency.
PGD centrifuges are widely used in industries where complete discharge and product purity are critical.
Suitable for:
Used for:
Common applications include:
Suitable for:
Used in sludge and resource recovery processes.
PGD centrifuges feature a fully enclosed discharge hopper.
This design:
For pharmaceutical and hazardous material applications, enclosed discharge systems are often preferred to meet stricter environmental and GMP requirements.
Frequent filter cloth replacement can become a major maintenance burden.
PGD centrifuges address this through:
Benefits include:
This feature is especially valuable for facilities running multiple products.
Yes.
A wide range of optional configurations are available, including:
Suitable for solvent-based processes and hazardous environments.
Including:
Featuring:
Supporting:
Optional lining materials include:
These options help adapt the centrifuge to highly corrosive or GMP-regulated processes.
PGD centrifuges are available in multiple sizes:
| Model | Basket Diameter | Maximum Load |
|---|---|---|
| PGD800 | 800 mm | 135 kg |
| PGD1000 | 1000 mm | 230 kg |
| PGD1250 | 1250 mm | 500 kg |
| PGD1600 | 1600 mm | 1000 kg |
| PGD1800 | 1800 mm | 1500 kg |
This wide range allows both medium-scale and large-scale production facilities to select an appropriate model.
Different processes require different discharge technologies.
For example:
For applications where residual cake removal is the primary concern, PGD centrifuges provide an additional advantage through their unique bag-shaking discharge mechanism.
As production requirements become stricter, manufacturers are increasingly focused on:
The PGD Bag-Shaking Bottom Discharge Scraper Centrifuge addresses these objectives through its combination of:
For facilities struggling with incomplete discharge and frequent cleaning interruptions, it offers a practical solution to improve both productivity and process reliability.
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