Drop-Thru Rotary Airlock Valves
The Drop Thru Rotary Airlock valve is our standard unit and is utilized in most applications. These valves are available in a round or square design.
Carolina Conveying’s rotary airlocks are a heavy duty design with thick castings, thick blade rotors with oversized shafts, outboard re-greaseable bearings, and gland type shaft seals.
Numerous rotor options are available:
- Open end, closed end, fixed blades, adjustable blades, beveled edges, scalloped pockets, reduced volume, quick release, Teflon coated, abrasion resistant tips, flexible rubber tips, and more.
Sizes available:
- 5, 6, 8, 10, 12, 14, 16, 18, 20, 24, 30 and 36 inch.
Applications vary from the bottom of dust collectors to pneumatic conveying.
Related products
Drop Thru Rotary Airlock Valves
The Drop Thru Rotary Airlock valve is our most popular unit and utilized in most applications. These valves are available with both round and square flanges, and Cast Iron or Stainless Steel construction.
Carolina Conveying’s rotary airlocks are a heavy duty design with robust castings, thick blade rotors with oversized shafts, outboard re-greaseable bearings, gland type shaft seals and high efficiency drive packages.
Numerous rotor options are available:
- Open-end, closed-end, fixed blades, adjustable blades, beveled edges, scalloped pockets, reduced volume, quick release, Teflon coated, abrasion resistant tips, flexible rubber tips, and many more.
Sizes available:
- 4, 5, 6, 8, 10, 12, 14, 16, 18, 20, 24, 30 and 36 inch.
- Special rectangular flanges are also available.
Applications vary from the bottom of dust collectors to pneumatic conveying.
Drop Thru Rotary Airlock Valves Features & Benefits:
- Heavy Duty Castings for Body and End Covers.
- Rotor robustly constructed with thick vanes and large shafts to ensure tight tolerances are held.
- An unlimited number of rotor options are available including open end, closed end, fixed blades, adjustable blades, beveled edges, scalloped pockets, reduced volume, quick release, polished finishes, special coatings, abrasion resistant material, flexible rubber tips and many more.
- End covers are spigot located into the body for concentricity.
- The body, end covers and rotor are precisely machined in CNC center to ensure tight tolerances, minimal clearances between the rotor and housing, maximum pressure differential sealing, and minimal leakage.
- Body vents for releasing pressurized air on return rotor pockets.
- Re-greasable, ball type bearings, mounted outboard.
- Gland type shaft seals with multiple rows of packing and design flexibility for air purging.
- Standard drives package includes high efficiency helical gearboxes that will accommodate any C Flange motor whether it is TEFC, explosion proof, chemical duty, inverter duty, wash down duty etc. Helical gear reducers transmit more torque than the industrial standard worm type reducers used by most of our competitors - requiring less power consumption and providing more energy savings.
- Compact assembled units deliver ready to be installed.
- Wide range of sizes available from stock for quick shipment.
Options:
Carolina Conveying Inc. has designed three types of Rotary Airlocks to meet industry demands:
- Drop Thru Valves
- Blow Thru Valves
- Side Entry Valves
Drop Thru:
The most common applications from pneumatic conveying to dust collection systems for powders and granules. Widest range of sizes and options available.
Side Entry:
Eliminates shearing and jamming, ideal for plastics, pellets, regrind and larger particles.
Blow Thru:
Pneumatic conveying applications with maximum efficiency and compact design, convey line air blows through the rotor pockets.
Airlocks have three main functions:
- Feeder applications with no pressure used purely to feed products from a bin or hopper at a controlled rate.
- Filter applications e.g. cyclones, baghouses and various collectors where fine dust must be collected while maintaining an air seal.
- Pneumatic conveying applications feeding material into a system against pressure or vacuum.
Carolina Conveying has the philosophy of meeting these demands with Heavy Duty Airlocks as standard.
Furthermore, with the introduction of sophisticated CNC machining equipment, volume sales and stock production - needs can be achieved with prompt delivery and competitive price.
All offered at the highest quality standards.
| Specifications | |
|---|---|
| Heavy Duty Cast Construction | Precision Machined with Tight Tolerances |
| Cast Iron or Stainless Steel | Round or Square Flanges |
| Pressure Differentials to 20 psi | High Temperature to 1500 F |
| 4” through 36” Size Range | Special Sizes Available |
| INDUSTRIES | ||
|---|---|---|
| Food | Plastics & Petrochemical | Animal Feed |
| Energy | Mining & Minerals | Chemical |
| Systems | ||
|---|---|---|
| Pneumatic Conveying | Dust Collection | Bulk Material Handling |
| Functions | ||
|---|---|---|
| Airlock only | Metering only | Airlock & Metering |
| Square Drop Thru Rotary Airlocks | |||||||||||||||||||
| Size | A | B | C | D | E | F | G | H | J | K | L | M | N | O | P | R | T | V | HP |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 6 | 6 | 9 7/8 | 1/2 | 5 1/2 | 11 | 8 1/4 | 8 1/4 | 11 1/2 | 16 | 10 1/4 | 8 1/4 | 1 1/4 | 5 5/8 | 12 | 1/2 | 1/4 | 3 | 2 3/4 | 0.5 |
| 8 | 8 | 11 7/8 | 1/2 | 6 1/2 | 13 | 7 1/4 | 9 1/4 | 12 1/2 | 16 | 11 1/4 | 9 1/4 | 1 1/4 | 5 5/8 | 12 | 1/2 | 1/4 | 3 | 3 9/16 | 0.5 |
| 10 | 10 | 13 1/4 | 9/16 | 7 1/2 | 15 | 8 5/8 | 10 3/8 | 13 5/8 | 18 1/4 | 12 5/8 | 10 5/8 | 1 1/2 | 6 3/8 | 12 | 9/16 | 3/8 | 3 | 4 | 1 |
| 12 | 12 | 15 3/4 | 3/4 | 9 1/8 | 18 1/8 | 7 1/4 | 11 5/8 | 14 7/8 | 18 7/8 | 13 1/4 | 11 3/4 | 1 1/2 | 7 3/4 | 12 | 1/2 | 3/8 | 3 | 4 11/16 | 1 |
| 14 | 14 | 18 1/2 | 3/4 | 10 1/8 | 20 1/4 | 7 | 12 | 15 1/4 | 20 1/4 | 14 1/4 | 12 1/8 | 1 1/2 | 8 3/4 | 12 | 1/2 | 3/8 | 3 | 5 1/2 | 1 |
| 16 | 16 | 21 5/8 | 3/4 | 11 7/8 | 22 13/16 | 4 3/4 | 14 5/8 | 19 | 24 5/8 | 18 | 14 7/8 | 2 1/2 | 9 1/4 | 12 | 11/16 | 5/8 | 3 | 6/12 | 1.5 |
| 18 | 18 | 24 | 3/4 | 12 3/4 | 24 13/16 | 3 3/4 | 15 5/8 | 20 | 24 5/8 | 19 | 15 7/8 | 2 1/2 | 11 1/4 | 12 | 11/16 | 5/8 | 3 | 7 3/8 | 1.5 |
| 20 | 20 | 25 5/8 | 3/4 | 13 3/8 | 26 3/8 | 5 1/4 | 16 5/8 | 21 | 27 1/2 | 19 7/8 | 16 7/8 | 2 1/2 | 11 3/8 | 14 | 11/16 | 5/8 | 4 | 5 13/16 | 2 |
| 24 | 24 | 29 1/2 | 3/4 | 15 | 29 1/2 | 3 1/4 | 18 5/8 | 23 | 27 1/2 | 21 7/8 | 18 1/4 | 2 1/2 | 13 1/4 | 14 | 11/16 | 5/8 | 4 | 6 13/16 | 3 |
| Round Drop Thru Rotary Airlocks | ||||||||||||||||||
| Size | A | B | C | D | E | F | G | H | J | K | L | M | N | O | P | Q | R | HP |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 6 | 6 | 11 1/4 | 1/2 | 5 1/2 | 11 | 8 1/4 | 8 1/4 | 11 1/2 | 16 | 10 1/4 | 8 1/4 | 1 1/4 | 5 5/8 | 8 | 7/8 | 9 1/2 | 1/4 | 0.5 |
| 8 | 8 | 13 1/2 | 1/2 | 6 1/4 | 12 1/4 | 7 1/4 | 9 1/4 | 12 1/2 | 16 | 11 1/4 | 9 1/4 | 1 1/4 | 5 5/8 | 8 | 7/8 | 11 3/4 | 1/4 | 0.5 |
| 10 | 10 | 16 | 9/16 | 7 7/8 | 15 | 8 5/8 | 10 3/8 | 13 5/8 | 18 1/4 | 12 5/8 | 10 5/8 | 1 1/2 | 6 3/8 | 12 | 1 | 14 1/4 | 3/8 | 1 |
| 12 | 12 | 19 | 3/4 | 9 1/2 | 18 5/16 | 7 1/4 | 11 5/8 | 14 7/8 | 18 7/8 | 13 1/4 | 11 3/4 | 1 1/2 | 7 3/4 | 12 | 1 | 17 | 3/8 | 1 |
| 14 | 14 | 21 | 3/4 | 10 5/8 | 20 1/2 | 7 | 12 | 15 1/4 | 20 1/4 | 14 1/4 | 12 1/8 | 1 1/2 | 8 3/4 | 12 | 1 1/8 | 18 3/4 | 3/8 | 1 |
| 16 | 16 | 23 1/2 | 3/4 | 11 7/8 | 22 13/16 | 4 3/4 | 14 5/8 | 19 | 24 5/8 | 18 | 14 7/8 | 2 1/2 | 9 1/4 | 16 | 1 1/8 | 21 1/4 | 5/8 | 1.5 |
| 18 | 18 | 25 | 3/4 | 12 5/8 | 24 5/8 | 3 3/4 | 15 5/8 | 20 | 24 5/8 | 19 | 15 7/8 | 2 1/2 | 11 1/4 | 16 | 1 1/4 | 22 3/4 | 5/8 | 1.5 |
| 20 | 20 | 27 1/2 | 3/4 | 13 3/8 | 26 3/8 | 5 1/4 | 16 5/8 | 21 | 27 1/2 | 19 7/8 | 16 7/8 | 2 1/2 | 11 3/8 | 20 | 1 1/4 | 25 | 5/8 | 2 |
| 24 | 24 | 32 | 3/4 | 15 3/16 | 29 15/16 | 3 1/4 | 18 5/8 | 23 | 27 1/2 | 21 7/8 | 18 1/4 | 2 1/2 | 13 1/4 | 20 | 1 3/8 | 29 1/2 | 5/8 | 3 |
Calculating Your Correct Valve Size
Valve size is based on volume. Throughput is usually expressed in lbs/hour or tons/hour, but for valve selection, the rate must be converted into cubic feet/hour.
∴ To calculate a valve throughput per hour:
Throughput lbs / hr
= cu. ft. / hr. capacity
Bulk Density lbs / cu. ft.
∴ Based on, say, 240,000 lbs / hr. at a bulk density of 80 lb /cu. ft.
Valve throughput required =
240,000 lb / hr
80 lb / cu. ft.
= 3000 cu. ft. / hr.
- The chart below shows valve size in the first column
- The top row lists the practical fill efficiency for most applications
- The bottom row lists the rotor RPM
- Comparing the valve size to the rotor RPM, the corresponding discharge rate is shown based on the practical fill efficiency
On this application two valves can be selected:
(a) 24” Valve @ 10 RPM @ 90% fill efficiency
(b) 20” Valve @ 20 RPM @ 78% fill efficiency
For products with very light bulk density (< 20 pcf), a lesser fill efficiency must be used to calculate valve size.
| Practical Capacity in Cubic Feet per Hour (CFH) | |||||||||||||||
| SIZE | CFR | 100% | 100% | 100% | 98% | 95% | 90% | 88% | 86% | 84% | 81% | 78% | 74% | 71% | 68% |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 24 | 5.683 | 341 | 682 | 1364 | 2005 | 2591 | 3069 | 3601 | 4105 | 4583 | 4971 | 5319 | 5551 | 5810 | 6029 |
| 20 | 3.233 | 194 | 388 | 776 | 1141 | 1474 | 1746 | 2048 | 2336 | 2607 | 2828 | 3026 | 3158 | 3305 | 3430 |
| 18 | 2.333 | 140 | 280 | 560 | 823 | 1064 | 1260 | 1478 | 1685 | 1881 | 2041 | 2184 | 2279 | 2385 | 2475 |
| 16 | 1.667 | 100 | 200 | 400 | 588 | 760 | 900 | 1056 | 1204 | 1344 | 1458 | 1560 | 1628 | 1704 | 1768 |
| 14 | 1.017 | 61 | 122 | 244 | 359 | 464 | 549 | 644 | 735 | 820 | 890 | 952 | 993 | 1040 | 1079 |
| 12 | 0.7 | 42 | 84 | 168 | 247 | 319 | 378 | 444 | 506 | 564 | 612 | 655 | 684 | 716 | 743 |
| 10 | 0.38 | 23 | 46 | 91 | 134 | 173 | 205 | 241 | 275 | 306 | 332 | 356 | 371 | 389 | 403 |
| 8 | 0.19 | 11 | 23 | 46 | 67 | 87 | 103 | 120 | 137 | 153 | 166 | 178 | 186 | 194 | 202 |
| 6 | 0.069 | 4 | 8 | 17 | 24 | 31 | 37 | 44 | 50 | 56 | 60 | 65 | 67 | 71 | 73 |
| 5 | 0.039 | 2 | 5 | 9 | 14 | 18 | 21 | 25 | 28 | 31 | 34 | 37 | 38 | 40 | 41 |
| 1 | 2 | 4 | 6 | 8 | 10 | 12 | 14 | 16 | 18 | 20 | 22 | 24 | 26 | ||
| Rotor Speed in RPM | |||||||||||||||
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