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Check valves with plastic diaphragms

  • Non-return valves
  • Non-return armatures
Low-wear check valves from the manufacturer with plastic diaphragms to protect against the backflow of liquid, pasty and gaseous media.

Technical features of our non-return armatures

Our non-return valves are equipped with a diaphragm to prevent the discharge of liquid and gaseous fluids. The special feature of the latter is a silent closing without water hammer. This anti-return device guarantees the waterproofing essential for optimal fluid management, even with granular or sandy water. Non-return valves serve as raw filters and thus secure your equipment. In addition, they do not have moving moving parts subject to wear and tear, which guarantees a long service life.

Check valves - Technical data

  • Nominal pressure up to 16 bar
  • Temperature ranges: -20° to +200°C (no steam)
  • Fluid velocity: 2.5 m/sec.
  • Gas velocity: 15 m/sec
  • Nominal size: from DN 20 to DN 600
  • Liquid: water, oils, acids and bases

Materials of non-return valves

Check valves have a diaphragm whose material must be chosen according to its use.
Check valves with ethylene-propylene-diene rubber diaphragm EPDM:

  • For hot and cold water
  • Suitable for steam sterilization for short periods of time
Check valves with a Viton® Fluorcarbon membrane:

  • For chemical industry
  • Acid resistant
  • Temperature resistant -20 to +220 °C
Check valves with nitrile rubber diaphragm NBR:

  • for solar technology
  • for thermal cogeneration plants
  • for petrochemistry
Check valves with a fluorosilicone membrane FVMQ:

  • weather-resistant
  • unalterable
  • temperature-resistant
  • ozone-resistant
Check valve with silicone diaphragm VMQ:

  • Hot air temperatures up to +210°C
  • Cold resistance down to approx. -60°C
  • Water temperatures up to 100°C
  • For food industries and drinking water

Installation examples of non-return armatures

The membrane is fixed in the perforated support cone and its sealing lip rests on the inner surface of the cone. When the pressure increases, the membrane deforms and allows the fluid to pass through. In the event of a pressure drop, the diaphragm returns to its initial position and closes the non-return valve.

Check valve AS 54 - DN 40 to DN 200

  • fast and cheap
  • for retrofitting
  • without structural changes

Check valve AS 41 - DN 25 to DN 200

  • for standard fittings
  • for mounting in flat-sealing unions

Check valve SFL Flange - DN 40 to DN 200

  • for flange valves from 40 to 200mm
  • hot-dip galvanized, powder-coated or stainless steel

Check valve MKV multi-cone - DN 150 to DN 600

  • for pipe diameters from 150 to 600mm
  • powder coated or stainless steel
  • as welded construction

Check valve AS NU - DN 25 to DN 100

  • for sanitary and industrial fittings
  • for small flange diameters
  • with O-ring on the outside of the flange

Check valves - application areas

Non-return valves from Lasso Technik AG have a wide range of applications
  • fire protection systems
  • petrochemistry
  • process engineering
  • solar technology
  • food industry
  • irrigations
  • water treatment
  • groundwater pumps
  • heating installations
  • waterworks
  • sanitary facilities
  • chemical industry

Further areas of application for our non-return valves

  • pumping stations
  • water supply
  • house installation
  • cooling water systems
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Mr. Daniel Rohrer
Managing Director of Lasso Technik AG
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Lasso Technik AG
Niklaus von Flüe-Strasse 33
4059 Basel
Switzerland
+41 61 331 40 90
lasso@lasso.ch
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