Non-Return Valves | wittgas.com

Non-Return Valves

WITT Non-return valve 600H-ES

Non-Return Valve 600H-ES

Non-return valve stainless steel for the prevention of unintended gas mixtures, for flow rates up to to 67,067 scfh (air), up to 580 psi, G 1/2 - G 1

WITT Non-return valve NV300

Non-Return Valve NV300

Non-return valve for the prevention of unintended gas mixtures, for flow rates up to flow rates up to 322,118 scfh (air), up to 232 psi, for use in thermal processing plants, certified to EN746-2, G 1 - G 1.1/4

WITT Non-return valve 338-ES

Non-Return Valve 338-ES

Non-return valve, stainless steel, for the prevention of unintended gas mixtures, for flow rates up to 285,916 scfh (air), up to 232 psi for use in thermal processing plants, certified to EN746-2, G 1 - G 1.1/4

WITT Non-return valve NV400

Non-Return Valve NV400

Non-return valve for the prevention of unintended gas mixtures, for flow rates up to 285,916 scfh (air), up to 232 psi, for use in thermal processing plants, certified to EN746-2, G 1.1/2 - G 2

Witt Non Return Valve Nv400 Intermediate Flange Version

Non-Return Valve NV400 intermediate flange version

Non-return valve (intermediate flange version) for the prevention of unintended gas mixtures, for flow rates up to 8100 m³/h (air), up to 16 bar, for use in thermal processing plants, certified to EN746-2, DN 40/50

WITT Non-return valve 339-ES

Non-Return Valve 339-ES

Non-return valve, stainless steel, for the prevention of unintended gas mixtures, for flow rates up to 285,916 scfh (air), up to 232 psi for use in thermal processing plants, certified to EN746-2, G 1.1/2 - G 2

Witt Non Return Valve 339 Es Intermediate Flange Version

Non-Return Valve 339-ES intermediate flange version

Non-return valve stainless steel (intermediate flange version) for the prevention of unintended gas mixtures, for flow rates up to 8100 m³/h (air), up to 16 bar, for use in thermal processing plants, certified to EN746-2, DN 40/50

Witt Non Return Valve 800 Es

Non-Return Valve 800-ES

Non-return valve, stainless steel, for the prevention of unintended gas mixtures, up to 4,351 psi, 1/4" NPT

Witt Non Return Valve Rv80 Nv800

Non-Return Valve NV800

Non-return valve for the prevention of unintended gas mixtures, for flow rates up to 494,176 scfh (air), DN 80

Witt Non Return Valve Rv320 Nv2000

Non-Return Valve NV2000

Non-return valve for the prevention of unintended gas mixtures, for flow rates up to 945,994 scfh (air), for use in thermal processing plants, certified to EN746-2, DN 80-200

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A safe gas supply with gas non-return valves

WITT gas non return valves (check valves) are used to protect plants, piping systems and outlet points against dangerous gas backflow and unwanted gas mixtures. Key features of WITT’s unique design are their very low opening pressures and very low pressure drop, so they are particularly suited to low operating pressure applications. A high-quality sealing system with elastomers prevents leaks. Dirt filters at the inlet ensure the long service life of these devices.

Non-return valves are also known as gas back-flow valves or check valves. WITT gas non-return valves can be installed in any orientation. They are available with various connections, in brass or stainless steel, and can be used for all technical gases such as oxygen, nitrogen, methane, hydrogen and compressed air. The WITT product range offers a wide selection of nominal sizes (up to DN 200) and flow rates.

WITT non-return valves in thermal processing plants

WITT non-return valves conform to EN 746-2 and are particularly suitable for use in thermal processing plants. Various WITT non-return valves are specially certified by the DVGW (Deutscher Verein des Gas- und Wasserfaches) as not needing any additional flame arrestor in the line when burning methane in air – thereby reducing costs and pressure drops. The low opening pressure of only 3 mbar and the high flow rate provide ideal protection for burner systems and prevent gas backflow and flashbacks.

WITT non-return valves can be installed in the air or oxygen line as well as in the fuel gas supply, thus reducing acquisition and storage costs. WITT non-return valves are 100% tested to EN 730-2 prior to delivery and offer the highest level of safety.

Safe biogas plants with WITT gas non-return valves

In the air delivery lines to fermenters and biogas lines, WITT gas non-return valves are also characterized by their ultra-low opening pressures. WITT stainless steel valves with DVGW approval for operation in biogas plants allow an air flow only in one direction and thus avoid unwanted and dangerous gas mixtures. Due to their low pressure losses, the use of small pipe cross-sections is possible, which reduces the operating costs for the compressor performance. WITT check valves are particularly leak-tight and therefore particularly safe. The valves are 100% tested and conform to DIN EN ISO 5175-2. The use of stainless steel in the gas return valves ensures a long service life, as these materials are extremely resistant to corrosion. They can also be retrofitted into existing air and gas supply lines.

Flyer: Non-return valves in thermal processing plantsFlyer: Non-return valves in biogas plants

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Headquarters: +49 (0)2302-8901-0
WITT USA: +1 770-664-4447

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