Products

Blow-Thru Rotary Airlock Valves

Our Blow-Thru Rotary Airlock Valve is used only for pneumatic conveying applications – both positive pressure and vacuum. This unit is also very helpful in applications that have height limitations. Convey line adapters are provided to suit the application.

Instead of your typical outlet, blow-through rotary airlocks include two ports on the sides of the valve near the bottom of the valve. The conveying line pipe connects directly to the valve-end covers, with the air stream flowing through the rotor pockets.

This design is highly efficient and works well with materials that tend to hang-up in the rotor pockets. However, this valve is not recommended on abrasive products, as the vanes will quickly wear.

Sizes include:

6, 8, 10, 12 and 16 inch.

Categories: Valves, Rotary Tags: Valves, rotary airlock, blow thru

Blow Thru Rotary Airlock Valves

The Blow Thru Rotary Airlock Valve is used in pneumatic conveying applications, both positive pressure, and vacuum systems.

Instead of an outlet throat, the blow thru airlock has ports on the sides of the end covers that connect directly to the convey line pipe. The convey line air blows through the rotor pockets which is very efficient and cleans the pockets.

Since an outlet convey line adapter is not required, the blow thru airlock is also very compact and requires less space for installation.

The valve comes with adapters to match the line size, both standard schedule pipe and OD tubing are available.

A typical connection is via compression couplings, but adapters are also available with flanges and threaded couplings.

Sizes include:

6, 8, 10, 12, and 16 inch Round.

Numerous rotor options are available:

Open-end, fixed blades, adjustable blades, beveled edges, scalloped pockets, reduced volume, quick release, Teflon coated, abrasion-resistant tips, and many more.

View Info Dimensions Capacity chart Contact

Blow Thru Rotary Airlock Valve 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 Table
Heavy Duty Cast Construction	Precision Machined with Tight Tolerances
Cast Iron or Stainless Steel	Round Flanges
Pressure Differentials to 20 psi	6” through 16” Size Range

INDUSTRIES
Food	Plastics & Petrochemical	Animal Feed
Energy	Mining & Minerals	Chemical

Systems
Pneumatic Conveying

Functions
Airlock only	Airlock & Metering

Size	A	B	C	D	E	F	G	H	J	K	L	M	N	O	P	Q	R	T	OD	HP
	Round Blow Thru Rotary Airlocks
6	6	11	1/2	5 1/2	10 5/8	8 7/8	7 5/8	10 3/4	14 3/8	10 1/4	8 13/16	1 1/4	5 5/8	8	7/8	9 1/2	1/4	11 5/8	2 3/8	0.5
8	8	13 1/2	1/2	6 5/16	12 3/16	7 7/8	8 5/8	11 7/8	14 3/8	11 1/4	9 7/8	1 1/4	5 5/8	8	7/8	11 3/4	1/4	12 5/8	2 7/8	0.5
10	10	16	9/16	7 7/8	15	9	9 15/16	13 9/16	17 3/8	12 5/8	11 1/4	1 1/2	6 1/8	12	1	14 1/4	3/8	13 15/16	3 1/2	1
12	12	19	3/4	9 7/16	18 5/16	7 7/8	11 1/8	14 7/8	18 7/8	13 3/4	12 3/8	1 1/2	7 11/16	12	1	17	3/8	15 1/8	4	1
16	16	23 1/2	3/4	11 13/16	22 13/16	8 3/16	13 3/4	18 3/4	23 1/4	18	15 3/4	2 1/2	9 1/4	20	1 1/8	21 1/4	5/8	17 11/16	5 9/16	1.5

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.

SIZE	CFR	100%	100%	100%	98%	95%	90%	88%	86%	84%	81%	78%	74%	71%	68%
	Practical Capacity in Cubic Feet per Hour (CFH)
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