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Silvent 804

SILVENT 804: an energy-efficient Laval nozzle that is part of Silvent’s new “SILVENT SOFT™” series. The air nozzle is specially made in EPDM rubber to minimize the risk of scratches, such as on the surface of tools. The product meets the unique combination of demands for a scratch-free surface and high blowing force by applying Silvent’s patented Laval technology. Silvent Laval technology is achieved by surrounding a core of air traveling at supersonic speed with a protective sheath of air moving parallel to the central air jet. The SILVENT SOFT 804 is ideal for all industries in which equipment and products are handled that cannot be damaged during compressed air blowing.
Noise reduction 71%
Air/cost savings 41%


SI units US units  
Blowing force12.0 N2.6 lbs
Air consumption70.0 Nm³/h41.2 scfm
Sound level90 dB(A)
Blowing patternLaval
ConnectionG 3/8" 3/8"-18 NPT
Connection typeFemale
DimensionsØ28 x 35 mmØ1.10 x 1.38 inch
Weight0.027 kg0.060 lbs
Max temp70 °C158 °F
Max operating pressure1.0 MPa143.0 psi


Replace open pipe8 mm5/16 inch
Noise reduction [dB(A)]18 dB(A)71 %
Air/cost savings [Nm³/h]48 Nm³/h41 %
Meet the EU Machine directivesYes

Blowing properties at different pressures

SI units (kPa)2004006008001000
Blowing force (N)4.89.715.019.524.5
Air consumption (Nm³/h)35.258.981.8105.0127.8
Sound level (dB(A))
US units (psi)406080100120
Blowing force (oz)21.935.348.760.772.4
Air consumption (scfm)25.935.445.454.564.2
Sound level (dB(A))

Air cone patterns and velocity distribution

SI units (mm)50100200300400500
Blowing pattern (ø)82108162215268321
Velocity (m/s)249199101785651
US units (inch)248121620
Blowing pattern (ø)
Velocity (ft/s)817653331256184167

Blowing pattern

100 (4")
200 (8")
300 (12")
108 (4.21")
162 (6.32")
215 (8.4")