Distribution head valve bridging for Vacuum Drum Rotary Filters
Distribution head valve bridging (also known as a main valve, diverter valve, or air-liquid distribution disc) of a rotary vacuum drum filter is a core component that enables zoned vacuum/blow switching and air-liquid separation & discharge for the drum. It directly determines the filtration efficiency and operational stability of the filter.
The drum surface of a vacuum drum filter is divided into multiple working chamber, including Regeneration chamber, cake detachment chamber, washing filtrate discharge chamber, dewatering, and filtrate discharge chamber. The core function of the distribution head valve bridging assembly is to precisely distribute vacuum or compressed air to these different zones.
- Yinuo offers customized designs tailored to clients’ specific requirements, ensuring that the distribution head valve achieve optimal compatibility with vacuum drum filters of various specifications and types, thus meeting the diverse production needs of different customers.
Features
Rational Structural Design
A flat-contact distribution valve with segments aligned to drum zones divides the circumference into vacuum and blind zones. Positioned above filter cloth detachment and below slurry level, blind zones block air ingress, preventing vacuum loss and keeping slurry adhered to the drum mesh.
High-Quality Materials
The valve body is constructed from stainless steel, offering excellent corrosion resistance and wear resistance. The rotating and stationary discs utilize wear-resistant materials paired with stainless steel for friction surfaces, minimizing wear during long-term operation and significantly extending the service life of the diverter valve.
Superior Sealing Performance
Contact surface pressure is regulated by external end springs, maintaining optimal sealing between wear and bridge plates. This reduces air leakage and enhances vacuum drum filter efficiency. Additionally, Yinuo uses advanced testing equipment for rigorous sealing inspections, ensuring consistent product quality.
primary core function
The drum surface of a RVDF is divided into multiple working zones, including filtration, washing, dewatering, and discharge. The core role of the distribution head valve is to precisely distribute vacuum or compressed air to these different zones, with specific functions as follows:
- Zoned Air Supply/Vacuum Extraction: Via the internal annular air channels of the Distribution head valve, external vacuum systems and compressed air systems are connected to different compartments of the drum. As the drum rotates, each compartment sequentially enters its corresponding working zone (e.g., vacuum extraction in the filtration zone, compressed air injection in the discharge zone).
- air-Liquid Separation and Discharge: In the filtration zone, the distribution head valve separates the “filtrate + vacuum” drawn into the compartments: filtrate is directed to storage tanks through liquid channels, while vacuum is recirculated to the vacuum pump. This prevents air-liquid mixing from reducing pump efficiency or contaminating the filtrate.
- Sealing and Leak Prevention: The valve assembly forms a tight seal with the drum’s end face (typically fitted with wear-resistant sealing rings), preventing cross-flow of vacuum/air between zones. This ensures stable pressure in each working zone—for instance, insufficient vacuum in the filtration zone would increase cake moisture content.
Custom Parameter Specification Sheet
| Category | Parameter Item | Specification / Filling Instructions | Example Value |
| Basic Specifications | Adaptive Drum Diameter | Must match the nominal diameter of the vacuum drum filter’s drum (Unit: mm) | 1000mm, 1600, 1850, 2350, 2640, 3170, 3430 |
| Adaptive Drum Compartment Quantity | Corresponding to the number of independent compartments inside the drum, which determines the number of air channel partitions of the valve disk | 16 units | |
| Disk Body Diameter | Nominal diameter of the valve disk body, which must cover the opening range of the drum end-face compartments (Unit: mm) | 1300mm | |
| Disk Body Thickness | Designed according to strength requirements, must be suitable for the drum installation space (Unit: mm) | 80mm | |
| Air Channel & Channel Design | Number of Air Channel Partitions | Matches the drum working process (e.g., filtration, washing, dehydration, discharge zones; at least 4 partitions) | 5 partitions (Filtration + Washing + Dehydration + Discharge + Standby) |
| Air Channel Angle of Each Partition | Central angle corresponding to a single air channel, must be consistent with the angle of the drum working zone (Unit: °) | Filtration zone 120°, Discharge zone 30° | |
| Vacuum Channel Caliber | Inner diameter of the channel connecting the external vacuum pump, designed according to vacuum flow requirements (Unit: mm) | DN50 (Inner diameter 50mm) | |
| Compressed Air Channel Caliber | Inner diameter of the channel connecting the external air compressor, designed according to the pressure requirements for discharge air blowing (Unit: mm) | DN40 (Inner diameter 40mm) | |
| Filtrate Discharge Channel Caliber | Inner diameter of the channel connecting the filtrate storage tank, must be suitable for the filtrate viscosity (larger caliber is required for high-viscosity media) (Unit: mm) | DN65 (Inner diameter 65mm) | |
| Material Selection | Disk Body Material | Selected according to the corrosiveness of the filtering medium (e.g., stainless steel 304/316L, cast iron, PTFE coating) | Stainless steel 316L |
| Sealing Friction Pair Material | Must be wear-resistant and suitable for operating temperature (e.g., graphite, silicon carbide, filled polytetrafluoroethylene) | Graphite – silicon carbide pairing | |
| Sealing Ring Material | Auxiliary sealing component, must be resistant to medium corrosion (e.g., nitrile rubber, fluororubber) | Fluororubber | |
| Performance Parameters | Maximum Operating Vacuum Degree | Maximum vacuum pressure that the valve disk can withstand (Unit: kPa) | -93kPa (Absolute pressure 8kPa) |
| Maximum Operating Air Pressure | Maximum allowable pressure for discharge air blowing (Unit: MPa) | 0.6MPa | |
| Applicable Operating Temperature | Must cover the temperature range of the filtering medium (Unit: ℃) | -10℃~120℃ | |
| Leakage Rate | Leakage between adjacent air channels under normal temperature and pressure (Unit: mL/min) | ≤5mL/min (@0.5MPa air pressure) | |
| Installation & Maintenance | Installation Method | Fixing method (e.g., flange connection, bolt fastening), the number of mounting holes and hole diameter must be specified | Flange connection (8 M16 mounting holes) |
| Recommended Maintenance Cycle | Recommended cycle for seal replacement and surface cleaning (adjusted according to usage frequency) | Inspection after 3000 hours of continuous operation | |
| Application Scenarios | Adaptive Filtering Medium Type | Specify the characteristics of the applicable suspension (e.g., corrosiveness, viscosity range, solid particle size) | Weakly corrosive liquid, viscosity ≤50cP |
| Adaptive Equipment Model | Corresponding specific model of the vacuum drum filter (to be filled in if it is a customized part) | G2/1, G5/1.6, G10/1.85, G20/2.35, G30/2.64, G40/3.17, G45/3.17, G60/3.43 |
