why-sp-hl-pressure-vessel-conveyor-is-the-right-choice-to-convey-foundry-silica-sand
The RIECO-KLEIN pressure vessel conveyor SP-HL was conceived for the continuous conveying of dry, granular, and pourable bulk material such as silica sand and similar products. The Klein SP-HL vessel is a unique pneumatic conveyor, designed to convey granular products up to 500 feet (150 meters) at a low velocity (100 – 400 ft/min | 0.5 – 2 m/s). A distinctive two- part pressure vessel inserts slugs of material into the line for continuous movement. A smooth and continuous conveying process is ensured by extremely short filing cycles and constant air injection into conveying line.
In contrast, conventional conveyors employ a conveying process which is interrupted in order to decrease the conveying pressure and refill the pressure vessel. Thus, the advantages of the SP-HL in contrast to conventional conveyors are:
Advantages Include:
- Higher conveying capacity
- Up to 45 % reduction in compressed air compared to other “Dense Phase” Conveyors
- Low Energy / Low Compressed Air Usage
- Minimal Pipeline Wear
- Minimal Product Degradation
- Compact design
- Less air wastage and less strain on the filter
- Low maintenance, less expenditure
- Excellent accessibility of wearing parts.
- Air-flushed cone valve
The operating mode of KLEIN pressure vessel conveyors SP-HL: Continuous, Simple, Smooth
1. Filling stage
- The inlet valve is open and the material enters the pressure vessel. The filling process is time-controlled. The flap of the discharge valve is pressed against the sealing edge of the discharge opening by the closing spring and the air pressure prevailing in the conveying line.
3. Conveying stage
- After the inlet valve has closed, air continues to flow from the nozzle ring and builds up the required con- veying pressure in the pressure vessel. As soon as the pressure prevailing in the conveying line is exceeded, the discharge valve opens and the material is supplied into the conveying line.
3. Closing stage
- A bellow cylinder forces the inlet cone towards the cone seal, the valve area being simultaneously flushed with air from the nozzle ring. This ensures air-tight closing of the inlet with a minimum of wear.
4. Switching / Exhaust stage
- After the pressure vessel has been emptied, a leaf spring presses the flap of the discharge valve against its seat so that the inductive min. probe is activated. The air feed into the pressure vessel is interrupted and the bellow cylinder of the inlet valve is exhausted. The ventilation valve opens and the pressure in the pressure vessel drops until the inlet cone is lowered by its own weight. Thus, clearing the passage for the next filling cycle.
Advantages Include:
- Foundry Sand Conveying
- Abrasive Granular Material Conveying
- Granular products greater than 80 ASF in size
- Ceramic and Glass beads