Using one incorrectly can cause machinery to suffer undue wear and operate less efficiently. It can also lead to increased costs due to extra maintenance and operator working hours. In the worst case, it can cause equipment to break or malfunction to the point that downtime is necessary. Wear-and-tear to the rotor, housing, or both is one of the leading causes of airlock valve failure. Processing abrasive materials causes cumulative damage to the surfaces inside the valve.
Surface drag abrasion occurs when materials are trapped between two surfaces moving in different directions. It can also be the result of any kind of surface-on-surface contact where abrasive materials are between the two planes. This misdirected air can cause significant loss of efficiency and issues with material flow.
This wayward air can also carry with it abrasive particles that can cause unnecessary damage to valve components. The experts at Streamline Industries can find or fabricate the perfect valve for your needs. They also perform repairs on existing valves, and will give you honest answers about whether repair or replacement is the better option in your situation. The material leakages [8]. Therefore, the construction material being handled enters the pockets at the top, through the inlet considerations are taken seriously.
As the blades and III. The schematic diagram of rotary airlock A. Components The airlock application considerations are not to be taken lightly. While simple by design, airlocks are a very important element in material conveying and processing systems.
Because an improperly applied airlock can lead to poor efficiency, extra maintenance and operator manpower, product degradation, equipment wear and replacement, and lost production due to process shutdowns [5].
The concepts in design of the rotary airlock valve components to improve its performance and be able to perform properly are showed in Table 1. Figure 1: Schematic diagram of rotary airlock feeder In operation, material enters the inlet and drops into a rotor pocket. As the blades rotate, the material is carried in the pocket toward the outlet. To achieve a uniform feed and airlock feeding without leaking , shaft seals prevent air and material from leaking into or out of the valve [6].
Keep shaft deflection to a minimum. Blade Should tolerate high temperature and pressure. Flange Should tolerate high temperature and pressure. Housing In a drop-through valve body, a full-length inspection panel allows access to the side of the valve to clean out foreign material that may have jammed the rotor, with removing the panel also permits accurate adjustment of rotor tips to the valve body, compensating for wear.
Without a panel, the valve must be removed in order to set tips. Packing seal Concept of minimum air leakage around the gap between rotor shaft and bearing housing Closed blade Concept of being type of closed blade. The Rotary Airlock Valve Designed External view The developed rotary airlock valve has six pockets and it has a rotor diameter of 12 inches, a rotor length of 17 inches, and a square inlet dimension of 6 inches by 6 inches.
The clearance between the rotor and the housing is approximately 0. To vary the speed of the rotary airlock valve, a three phase frequency inverter was used to change the power frequency and three speeds were used: 26, The rotary airlock valve developed is shown in Fig.
Components in the rotary airlock valve, as shown in Fig. The rotor is supported by bearings, and a motor and drive turn the rotor shaft, causing the rotor to rotate inside the housing. The material of construction of each component is described in the legend of Fig. Design and construct hopper, and then equip with the clearance between the blade tips and the housing, and the rotary airlock valve. Run the motor and adjust its speed as designed. A variety of test runs were carried out and some 4.
Observe the rotation of the motor and its speed if it is comparison test results between the modified rotary airlock working as designed or not. Weight the material released from a pocket opening.
Materials used in testing are sawdust and bagasse. The tests 6. Follow step 2 through 5 again, but change the speed to are performed following three topics. The test for evaluating airlock performance, at the 7. Test again in the same manner, but change material rotary speed of 0 rpm. The test for evaluating airlock performance, at the C. The Test Results rotary speed of 26, Figure 4 shows the lines representing the relation 3.
The test for evaluating material handling capacity, at between the pressure as dropping from the leakage of the the rotary speed of 26, Equipments for Ttesting and Measuring drop, in which a length of time varies as a result of change in 1.
Pulley 20, 25 and 35 cm diameter the pressure dropping. V belt pulley B65 B70 and B75 The graph shows the length of time the pressure takes to 3. The average 4. Tachometer length of time that the rotary airlock valve can hold the 5. Alternating current AC Motor, Single phase, V, pressure until the pressure drop to 0 bar is minutes. Machined with a stainless steel rotor and chrome coatings, this rotary valve is built to last.
Put your own spin on our customizable valves to get the best valve for your application, material and industry. Our most popular stories of the year cover topics like airlock leakage, air purge kits, common flow issues, and material characteristics.
Downloads Our literature library contains product datasheets, brochures and technical schematics available for download. Literature This link opens in a new tab. Types of Rotors Our suite of rotors work with the demands, challenges and regulations involved with a wide range of materials.
BT Series - Spec Sheet The BT Series valves ensure optimal bulk density and throughput of hard-to-convey material; a return-side vent vents leaked air, maximizing air flow through the rotor, improving material flow. DC Series: Rotary Valve for Dust Collection, Feeding, and Metering Applications The DC Series valves are built to application-specific requirements, including: custom rotor configurations, factory-applied internal coatings, and sanitary materials of construction.
Discharge Trough Feeder Valve DTFV Series - Spec Sheet For extremely high-volume material handling applications where short-length screw conveyors or conventional rotary valve material handling capacities are not sufficient. DR-S Series: Rotary Valve for Metering, Feeding and Airlock Applications The DR-S Series valves are built to application-specific requirements, including: custom rotor configurations, factory-applied internal coatings, and sanitary materials of construction.
Gravity Diverter Valve, Y-style Series - Spec Sheet 2-way, Y-style, gravity diverter valve provides automated control of bulk material flow direction; improves efficiency of material feeding and loading operations. Maintenance Slide Gate - CI Valve - Air Operated - Spec Sheet Designed for gravity-flow applications; variable slide gate actuation settings enable partial material flow, as well as full-open or closed settings. Maintenance Slide Gate - CI Valve - Manually Operated - Spec Sheet Designed for gravity-flow applications; variable slide gate actuation settings enable partial material flow, as well as full-open or closed settings.
Maintenance Slide Gate for MD - Air Operated - Spec Sheet Designed for gravity-flow applications; variable slide gate actuation settings enable partial material flow, as well as full-open or closed settings. Maintenance Slide Gate for MD Valves - Manually Operated - Spec Sheet Designed for gravity-flow applications; variable slide gate actuation settings enable partial material flow, as well as full-open or closed settings.
Micro-ingredient valve The micro-ingredient valve from ACS Valves is designed for testing pilot conveying equipment, and for accurately metering small amounts of fine-grained material into larger batches. Mini 19 Series - Spec Sheet The Mini 19 Series valves are built to application-specific requirements, including: custom rotor configurations, factory-applied internal coatings, and sanitary materials of construction.
P Series: Rotary Valve - Spec Sheet The P Series valves, available with round or square flange, are built to application-specific requirements, including: custom rotor configurations, factory-applied internal coatings, and sanitary materials of construction.
Pressure Blower Package Spec Sheet Blower system design provides pressure conveying functions for dry bulk material handling operations requiring optimal balance of blower power and energy efficiency.
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