Spraytech DASA Series Full Cone Siphon Air Atomizing Spray Nozzles

Description

2. Siphon Principle
Siphon principle is utilized to lift liquid from a certain height from the spray nozzle, suitable where a pump or pressurized container of liquid is not available. 3. Gravity Head Principle
Gravitational head of liquid is utilized to feed liquid to the spray nozzle, suitable where a pump or pressurized container of liquid is not available.
Choice of Spray Nozzles
Each spray set-up consists of an air cap and liquid cap which provide a specific spray pattern capacity and coverage performance.

Inside Body Mixing
Liquid and air streams meet within the nozzle and are mixed together and expelled through the same orifice. This internal mixing means the streams are not independent; a change in air flow will affect the liquid flow. This makes precise metering of the liquid more difficult than with an External Mix Set-up. Internal Mix set-up is able to produce the finest atomization of any of the XA set-ups, but they are generally not suitable for use with liquids which have a viscosity that is above 200 centipoise.
Outside Body Mixing
The air and liquid streams exit the nozzle independently and are combined and mixed outside of the nozzles. Because there is no connection between the air and liquid lines within the nozzles, the air and liquid flow rates can be controlled independently, allowing precise metering of the liquid. The atomization can be controlled by adjusting the air flow rate; more air produces finer atomization. In most cases, these set-ups do not atomize as finely as Internal Mix Setups. External Mix Set-up may be used with liquid having a viscosity above 200 centipoise and for abrasive suspensions. Spraytech provides Engineering guidance for spraying high viscosity liquids.

DESIGN / SPRAY CHARACTERISTICS

• Lowest flow available
• Very fine atomization
• Narrow spray angle (12°- 25°)
• Full cone pattern
• Short to moderate forward spray projection

Flow Rates and Dimensions
Siphon-fed, External Mix, Round Spray Pattern, 1/8" and 1/4" Pipe Sizes, BSP or NPT

Pipe Size	Spray Set-up Number	ATOMIZING AIR		Liquid Capacity in l/h (Liters Per Hour)								Spray Dimensions at 200 mm. Siphon Height
				Gravity Head			Siphon Height
		Air (bar)	Nm3 h	450 mm	300 mm	150 mm	100 mm	200 mm	300 mm	600 mm	900 mm	“B” Effective Spray Length (mm)	Max. Spray Length (m)
		1/8 or 1/4	DASA 050	0.7 1.5 3.0 4.0	0.66 1.02 1.68 2.16	1.5 1.8 2.1 2.2	1.3 1.7 1.9 2.0	1.1 1.5 1.7 1.8	0.9 1.3 1.5 1.6	0.7 1.2 1.4 1.5	0.5 1.1 1.3 1.4	0.6 1.1 1.2	0.8 0.9	280 280 300 360	1.8 1.9 2.3 2.6
1/8 or 1/4	DASA 150			0.7 1.5 3.0 4.0	0.78 1.20 1.92 2.46	2.4 2.8 3.4 3.7	2.1 2.6 3.1 3.4	1.7 2.4 2.9 3.3	1.5 2.1 2.8 3.1	1.2 1.9 2.6 2.9	0.8 1.6 2.4 2.7	0.9 1.7 2.1	1.1 1.5	300 330 380 430	2.1 2.3 2.6 3.0
				1/8 or 1/4	DASA 200	0.7 1.5 3.0 4.0	1.38 2.16 3.48 4.44	2.5 2.9 3.4 3.7	2.3 2.8 3.3 3.6	2.0 2.5 3.2 3.5	1.6 2.2 2.9 3.4	1.4 2.0 2.8 3.3	1.1 1.7 2.5 3.0	0.9 1.9 2.5	1.2 2.0	300 330 380 430	2.4 2.7 3.4 4.0
						1/8 or 1/4	DASA 250	0.7 1.5 3.0 4.0	1.14 1.86 3.00 3.90	4.5 5.3 6.0 5.7	4.0 4.9 5.6 5.4	3.4 4.4 5.0 5.0	2.1 3.5 4.4 4.2	1.8 2.9 4.0 3.9	1.4 2.7 3.4 3.5	1.8 2.4 2.8	1.2 1.9	380 410 460 510	3.0 3.4 4.0 4.6
		1/8 or 1/4	DASA 400					1.5 3.0 4.0 5.6	3.48 5.28 6.66 8.82	22 25 26 26	19.9 23 24 24	16.3 19.5 21 22	12.3 16.7 18.4 19.7	10.5 14.2 15.7 17	8.3 11.5 12.9 14.6	2.8 6.4 7.9 9.8	2.8 4.5 6.1	460 510 530 580	3.7 4.3 4.9 5.5
1/8 or 1/4	DASA 450							2.0 3.0 4.0 5.6	8.64 11.4 14.4 18.9	44	43 42	40 39	27 30 31 31	22 26 28 28	16.8 21 23 24	11.0 16.7	8.3	510 530 580 630	6.7 7.0 7.6 8.2