Cone check valves with rubber diaphragm
Cone check valves with stainless steel valve cone and high-quality rubber diaphragm for silent use in drinking water pipes.
Technical features of our cone check valves
Our Stop Silent check valves are equipped with a diaphragm that prevents the back flow of liquid and gaseous fluids. The valve closes silently and without water hammer. This anti-reflux device ensures the required tightness even in the presence of dirty or granular fluids such as sand for example. The valve also acts as a raw filter and protects your systems. In addition, they do not have any moving mechanical parts subject to wear, which guarantees a long service life.
Cone check valves - Technical data
- Flow velocity: (fluids) 2.5 m/sec.
- Flow velocity: (gases) 15 m/sec
- Installation sizes: from DN 20 to DN 600
- Liquid: water, oils, acids and bases
- PN nominal pressure: 16 bar
- Heat degree: -20° to +200°C (no steam)
Installation examples of non-return valves
The membrane is located in the perforated support cone and the sealing lips rest 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 moves to the initial position and closes the cone check valve.
Non-return valve AS 54 - DN 40 to DN 200
- without structural changes
- for retrofitting
- fast and cheap
Non-return plug valve AS 41 - DN 25 to DN 200
- for standard fittings
- for mounting in flat-sealing unions
Non-return valve 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
Cone 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 multiple plug - DN 150 to DN 600
- powder coated or stainless steel
- for pipe diameters from 150 to 600mm
- as welded construction
Materials of the cone check valves
Our cone check valves are equipped with a diaphragm whose materials are to be chosen according to its use
Check valves with nitrile rubber diaphragm NBR:
- for thermal cogeneration plants
- for petrochemistry
- for solar technology
Check valves with silicone diaphragm VMQ:
- Water temperatures up to 100°C
- For food industry and drinking water
- Cold resistance down to approx. -60°C
- Hot air temperatures up to +210°C
Check valves with ethylene-propylene-diene rubber diaphragm EPDM:
- short term sterilisation with steam possible
- for hot and cold water
Check valves with a Viton® Fluorcarbon diaphragm:
- Temperature resistant -20 to +220 °C
- for chemical industry
- Acid resistant
Check valves with a fluorosilicone diaphragm FVMQ:
- weatherproof
- resistant to high and low temperatures
- unalterable
- ozone resistant
Stop Silent - Applications
Cone check valves from Lasso Technik AG have a wide range of applications
- irrigations
- process engineering
- food industry
- petrochemistry
- solar technology
- water treatment
- Chemical industry
- waterworks
- groundwater pumps
- sanitary facilities
- fire protection systems
- heating installations
Further areas of application for cone check valves
- house installation
- pumping stations
- cooling water systems
- water supply
Manufacturer, dealer, service provider
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Daniel Rohrer
CEO - Lasso Technik AG
CEO - Lasso Technik AG