Backflow preventer with low-noise membrane
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
- water supply
- house installation
- cooling water systems
- pumping stations
Manufacturer, dealer, service provider
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Daniel Rohrer
CEO - Lasso Technik AG
CEO - Lasso Technik AG