Skip to main content Skip to search Skip to main navigation

ULTRA 35 – Ultra Performance non-return valve/ check valve: compact, quiet, ideal for low-pressure applications

Product information "ULTRA 35 – Ultra Performance non-return valve/ check valve: compact, quiet, ideal for low-pressure applications"

WITT non-return valves for reliable protection against dangerous gas backflow in installations and pipework systems. The flow-optimised valve system ensures very low pressure loss with minimal noise emission. Every backflow preventer is 100% tested. The backflow preventers are tested in accordance with DIN EN ISO 5175-2. 
Highlights :

  • Safety element: Gas non-return valve [NV]
  • every gas non-return valve is 100% tested
  • in accordance with DIN EN ISO 5175-2
  • Suitable for use in applications in accordance with EN 746-2
  • offer minimal pressure loss – thanks to a sophisticated valve system with very low opening pressures (approx. 3 mbar)
  • compact and lightweight: 90 x 145 mm, approx. 2,789 g
  • minimal noise emission
  • offer long service life thanks to protection against contamination from the gas supply – via a dirt filter at the inlet made of stainless steel wire mesh (100 μm)
  • the ambient temperature must be between a minimum of -20 °C and a maximum of 70 °C
  • minimal leakage – thanks to the use of a spring-loaded valve system with elastomer seals
  • wide range of applications – suitable for use with many technical gases
  • reduce planning effort through layer-independent installation

Special versions are not available in the shop, but can be supplied on request. If you have specific requirements or special requests, please contact us – we’ll be happy to help!
Blow-off flow rate: See data sheet (download area)
max. working pressure: 2 bar (as a backflow preventer for combustion with air in accordance with DIN EN ISO 5175-1), 16 bar (as a non-return valve for non-flammable gases in accordance with DIN EN ISO 5175-2)
Opening pressure: 3 mbarg
Connection Inlet: G 3 (internal thread)
Connection outlet: G 2 (female thread)
Housing material: Brass (CuZn39Pb3)
Temperature range: -20 °C / -4 °F to +70 °C / 158 °F
Weight: 2,8 kg