Backflow preventer from the manufacturer with low-noise silicone membrane for use with fluids, drinking water and gases.
Technical features of our non-return valves
Our check valves are equipped with a diaphragm to prevent the return of liquids and gases. When the membrane is closed, a very low noise level is generated and water hammer is avoided. The backflow prevention valve also provides a reliable closure for granular liquids (e. g. with sand). Our device also acts as a raw filter, protecting pumps and systems. In addition, we guarantee a long product life as there are no mobile electronic or mechanical modules subject to damage.
Backflow preventer - Technical data
Installation sizes: from DN 20 to DN 600
Aqueous, oily, acidic and basic liquids
Pressure: 16 bar
Heat degree: -20° to +200°C (no steam)
Flow velocity: (fluids) 2.5 m/sec.
Flow velocity: (gases) 15 m/sec
Installation examples of non-return valves
The diaphragm lies unloaded in the perforated support cone and the sealing lips on the inner surface of the cone. With increasing pressure, the diaphragm deforms and allows the medium to flow through. When the pressure drops, the diaphragm moves to the initial position and closes the backflow preventer.
Backflow preventer SFL Flange - DN 40 to DN 200
hot-dip galvanized, powder-coated or stainless steel
for flange valves from 40 to 200mm
Backflow preventer AS 41 - DN 25 to DN 200
for standard fittings
for mounting in flat-sealing unions
Backflow preventer AS NU - DN 25 to DN 100
for small flange diameters
with O-ring on the outside of the flange
for sanitary and industrial fittings
Backflow preventer MKV multi-cone - DN 150 to DN 600
powder coated or stainless steel
for pipe diameters from 150 to 600mm
as welded construction
Backflow preventer AS 54 - DN 40 to DN 200
without structural changes
for retrofitting
fast and cheap
Backflow preventer materials
Backflow preventer have a diaphragm made of approved materials depending on the application.
Backflow preventer with ethylene-propylene-diene rubber membrane EPDM:
short term sterilisation with steam possible
for hot and cold water
Backflow preventer with silicone diaphragm VMQ:
Cold resistance down to approx. -60°C
Water temperatures up to 100°C
For food industry and drinking water
Hot air temperatures up to +210°C
Backflow preventer with a fluorosilicone membrane FVMQ:
ozone resistant
weather-resistant
temperature-resistant
unalterable over time
Backflow preventer with a Viton® Fluorcarbon membrane:
Temperature resistant -20 to +220 °C
For chemical industry
Acid resistant
Backflow preventer with nitrile rubber diaphragm NBR:
for thermal cogeneration plants
for petrochemistry
for solar technology
Backflow preventer - Applications
Backflow preventer of Lasso Technik AG have a wide application spectrum
process engineering
solar technology
Chemical industry
food industry
petrochemistry
irrigations
water treatment
groundwater pumps
heating installations
fire protection systems
waterworks
sanitary facilities
Further areas of application of the backflow preventer