| |
 •
Long Venturi Nozzles
• Short Venturi Nozzles
• Straight Nozzles
• Rules for the Selection and
Maintenance of Nozzles
• Table of Consumption of Compressed
Air/Abrasive Material
• Nozzles for Internal Pipe Blasting
• Nozzles for Internal Pipe Blasting
w/one outlet
• Wet Blasting Nozzles (Long Venturi)
Injection Nozzles
• "Bazooka" type Long Venturi Nozzles
• Nozzles for Suction Blasting
Machines
• Injection
Nozzles
The CMV blasting nozzles
feature a hard metal core (tungsten dicarbide) with very
high resistance to abrasion. Several designs have been
developed in order to obtain the best efficiency of
compressed air, abrasive material, and manpower, in several
applications. The housing system protects the core against
occasional shocks (impacts). The fastening system meets the
international standards, and enables the use of CMV nozzles
on equipment of other brand names. We can optionally supply
nozzles with a core in boron carbide or silicon carbide.
LONG VENTURI
NOZZLES
Of high output, they
produce abrasive material acceleration, which comes out at an
approximate speed of 724 km/h (450 mph). With this, an excellent
productivity is achieved, which reduces labor and compressed air
costs. These nozzles have housing in plastic material, which
ensures excellent protection of the hard metallic core against
shocks.
|
HOLE |
TOTAL LENGTH |
STOCK CODE |
|
MM |
"
|
MM |
"
|
W/THREAD |
W/O THREAD |
|
4,8 |
3/16" |
114 |
4.1/2" |
0434-0 |
0454-5 |
|
6,3 |
1/4" |
140 |
5.1/2" |
0431-6 |
0451-0 |
|
7,9 |
5/16" |
146 |
5.3/4" |
0432-4 |
0452-9 |
|
9,5 |
3/8" |
171 |
6.3/4" |
0433-2 |
0453-7 |
|
12,7 |
1/2" |
232 |
9.1/8" |
0435-9 |
0455-3 |
SHORT VENTURI
NOZZLES
Of medium output, they produce
abrasive acceleration, which comes out at an approximate speed of
400 km/h (248 mph). With this, a good productivity is achieved.
These nozzles are produced with steel housing, when threaded, and
with aluminum housing, when flanged, in both cases with insulation
against shock, in plastic resin.
|
HOLE |
TOTAL LENGTH |
STOCK CODE |
|
MM |
" |
MM |
" |
W/THREAD |
W/O THREAD |
|
3,2 |
1/8" |
38 |
3.1/4" |
0149-0 |
0436-7 |
|
4,8 |
3/16" |
85 |
3.3/8" |
0150-3 |
0437-5 |
|
6,3 |
1/4" |
89 |
3.1/2" |
0242-9 |
0438-3 |
|
7,9 |
5/16" |
92 |
3.5/8" |
0350-6 |
0433-2 |
|
9,5 |
3/8" |
95 |
3.3/4" |
0430-8 |
0450-2 |
STRAIGHT NOZZLES
Of low acquisition cost, they
are indicated for applications where no high productivity is
required. They are produced with a steel housing, with insulation
against shocks, in plastic resin.
|
HOLE
|
TOTAL LENGTH |
STOCK CODE |
|
MM
|
"
|
MM
|
"
|
W/THREAD |
W/O THREAD |
|
2,5 |
3/32" |
29 |
1.1/8" |
0140-6 |
0144-9 |
|
3,0 |
7/64" |
32 |
1.1/4" |
0141-4 |
0145-7 |
|
4,0 |
5/32" |
44 |
1.3/4" |
0146-5 |
0142-2 |
|
4,8 |
3/16" |
47 |
1.7/8" |
0147-3 |
0143-0 |
|
6,3 |
1/4" |
50 |
2" |
0148-1 |
0240-2 |
|
7,9 |
5/16" |
50 |
2" |
- |
0241-0 |
RULES FOR THE SELECTION AND
CORRECT MAINTENANCE OF BLASTING NOZZLES
Today, the user of pressurized
blasting equipment has several options regarding blasting nozzles,
as to size, type and composition, to comply with the most
different applications. Much confusion, however, can be eliminated
by following the rules below:
1)
First, decide which blasting fan in necessary: The shape of the
nozzle orifice (profile) determines its blasting fan. In general,
the blasting nozzles have a relatively narrow blasting fan, which
is excellent to blast smaller areas such as small lattice works,
stairs, handrails, welding seams, etc. The nozzles with a venturi
profile produce a wider blasting fan and considerably increase the
outlet speed of the abrasive material. The long venturi nozzles
even increase the speed of the abrasive material by up to 100%,
thus significantly improving productivity when blasting larger
surfaces.
2) Make sure the compressed air supply will meet the outflow needs
of the nozzle: The air compressor must provide a production of
compressed air (outflow) equal to or higher than the one indicated
in the table below.
3) Select the correct diameter of the nozzle: For higher
productivity, choose the largest nozzle diameter that is possible
to actuate with your compressed air installation (availability).
4) Choose the correct nozzle material: Do not choose only based on
price, or based on which nozzle is more resistant to wear. Cheaper
nozzles can be of a lower quality, which may significantly
decrease their useful life. On the other hand, boron or silicon
carbide nozzles are extremely resistant to wear resulting from
abrasion, but are brittle, and therefore they should not be used
in manual blasting operations, where they would be subject to
shocks and consequent breakages. Tungsten carbide is the material
that has been having a better performance, because it combines
resistance to abrasion with a reasonable tenacity.
5) Check the abrasive material to be used: When we use aluminum
oxide or silicon carbide as abrasive material in automated
blasting operations, we should try to use nozzles with a boron or
silicon carbide core, which will offer a longer useful life, in
these cases.
6) Check and replace the nozzles frequently: The blasting nozzles
are wear items that need to be replaced quite frequently. The wear
translates into pressure reduction and into the consequent loss of
blasting speed. For every pound of lost power, there is a loss of
1.5% in productivity.
TABLE OF
CONSUMPTION OF COMPRESSED AIR / ABRASIVE MATERIAL
|
NOZZLE |
AIR CONSUMPTION
DISPLACEMENT |
EFFECTIVE AIR CONSUMPTION |
NECESSARY POWER |
SAND CONSUMPTION |
|
MM |
" |
CFM |
m3/h |
CFM |
m3/h |
HP** |
Kg/H |
|
2,5 |
3/52" |
17 |
29 |
14 |
24 |
5/- |
35 |
|
3,0 |
7/64" |
26 |
44 |
20 |
34 |
7,5/- |
50 |
|
3,2 |
1/18" |
31 |
53 |
23 |
39 |
7,5/- |
56 |
|
4,0 |
5/32" |
47 |
80 |
35 |
60 |
10/- |
84 |
|
4,8 |
3/16" |
68 |
116 |
51 |
87 |
15/- |
125 |
|
6,3 |
1/4" |
117 |
200 |
88 |
150 |
30/25 |
220 |
|
7,9 |
5/16" |
182 |
311 |
137 |
234 |
40/30 |
368 |
|
9,5 |
3/8" |
266 |
455 |
200 |
342 |
60/45 |
484 |
|
12,7 |
1/2" |
453 |
774 |
340 |
581 |
100/75 |
890 |
*Data on the
consumption of air / abrasive material, considering a working
pressure between 7/8 kg/cm2 (80/100 PSI).
** Electric motor power necessary to drive the compressor, for
alternative (piston) or screw compressor, respectively.
NOZZLES FOR PIPE
BLASTING
Indicated
for blasting pipes with an internal diameter of 30-50 mm, they
feature an outlet with an angle of 45º. They are fastened through
a thread with a diameter of 3/4" - 14 NPSM. Total length is 55 mm
(2.3/18").
|
HOLE |
No OF OUTLETS |
STOCK CODE |
|
MM |
" |
|
3,2 |
1/8" |
1 |
0382-4 |
|
3,2 |
1/8" |
3 |
0377-8 |
|
4,8 |
3/16" |
1 |
0383-2 |
|
4,8 |
3/16" |
3 |
0384-0 |
|
6,3 |
1/4" |
1 |
0385-9 |
NOZZLES FOR PIPE
BLASTING WITH ONE OUTLET
Indicated for the internal blasting of pipes with an internal
diameter starting at 40 mm, they feature an angled outlet, and are
fastened through a thread with a diameter of 3/4" - 14 NNPSM.
|
HOLE |
STOCK CODE |
|
MM |
" |
|
4,8 |
3/16" |
0386-7 |
|
6,3 |
1/4" |
0387-5 |
|
7,9 |
5/16" |
0388-3 |
|
9,5 |
3/8" |
0389-1 |
WET BLASTING NOZZLES (LONG VENTURI)
Indicated for blasting of concrete, facades or metals located
outdoors.
They totally inhibit dust, with a minimum consumption of water at
the pressure of 2kg/cm2 (normal from the public water supply),
thus ensuring excellent productivity. They incorporate a valve to
control the water flow, and are coated with aluminum.
|
HOLE
|
TOTAL LENGTH
|
STOCK CODE |
|
MM |
" |
MM |
" |
|
6,3 |
1/4" |
146 |
5.3/4" |
0374-3 |
|
7,9 |
5/16" |
159 |
6.1/4" |
0375-1 |
|
9,5 |
3/8" |
171 |
6.3/4" |
1376-0 |
|
12,7 |
1/2" |
229 |
9" |
0379-4 |
"BAZOOKA" TYPE LONG VENTURI NOZZLES
These
nozzles provide a very high output, with similar characteristics
to the common long venturi nozzles, but with an intake cone with a
larger diameter (1.1/4 - 31.75mm) which ensures a better air /
abrasive material flow, thus obtaining a production that is
approximately 15% higher than that of conventional long venturi
nozzles. They have a brass-coated polyurethane housing which
ensures total protection to the core.
|
HOLE
|
TOTAL LENGTH
|
STOCK CODE |
|
MM |
" |
MM |
" |
|
7,9 |
5/16" |
146 |
5.3/4" |
0378-6 |
|
9,5 |
3/8" |
171 |
6.3/4" |
0380-8 |
|
12,7 |
1/2" |
232 |
9.1/8" |
0381-6 |
NOZZLES FOR SUCTION
BLASTING MACHINES
With a design especially
idealized for this application, they ensure excellent productivity.
These nozzles are produced with housings in steel, with insulation
against shocks, in plastic resin.
|
HOLE
|
TOTAL LENGTH |
STOCK CODE
W/ 1.1/4"NF THREAD |
|
MM |
" |
MM |
" |
|
4,8
|
3/16"
|
47
|
1.7/8"
|
0750-1
|
|
6,3
|
1/4"
|
50
|
2"
|
0751-0
|
|
8,0
|
5/16"
|
50
|
2"
|
0752-8
|
|
9,5
|
3/8"
|
53
|
2.1/8"
|
0753-6
|
|
11,1
|
7/16"
|
56
|
2.1/4"
|
0754-4
|
|
12,7
|
1/2"
|
59
|
2.3/8"
|
0755-2
|
NOTE: The air
consumption by suction equipment is determined by the nozzle /
injector.
INJECTION NOZZLES
|
HOLE
|
STOCK CODE
BLAST CABINET |
|
MM |
" |
|
2,0
|
5/64"
|
0756-0
|
0018-3
|
|
2,5
|
3/32"
|
0757-9
|
0019-1
|
|
3,0
|
1/8"
|
0758-7
|
0020-5
|
|
3,5
|
9/64"
|
0759-5
|
0021-3
|
|
4,5
|
11/64"
|
0760-9
|
0022-1
|
|
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