Non Return Valves

Non-return valves are safety devices to prevent backfeeding of gases. WITT non-return valves protect plants, pipelines and outlet Non-return valvepoints against reverse gasflow. They can also be used in accordance with EN 764 section 2 in applications where the maximum temperature does not exceed 70° C (158° F).

Witt have a significant range of Non-Return Valves with thread connections from 1/8″ BSP to flange DN 200 and flows up to 26,800 m3/h (rated in air) (NV2000). They are suitable for a range of technical gases (for acetylene, NRV 650 only). The sophisticated valve technology of WITT non-return valves provides small pressure drops making them also suitable for applications with smallest opening pressures. A high-quality sealing system with elastomeres prevents leakages and dirt filters at the inlet point assure long service life of the non-return valves. Benefits

* the non-return valves prevent backfeeding of gases which could lead to flammable mixtures being formed

* minimum pressure drops result from low opening pressures. eg. Model NV 200 is approximately 4 mbar (0.058 psi)

* the valve mechanism is protected by a mesh filter

* the valves are suitable for use with most non-corrosive gases

* the spring loaded valve is not affected by gravity and may be installed in any position

Maintenance In common with safety equipment non-return valves should be tested at least once a year for function and body leak tightness. Testing equipment is available on request. Witt non-return valves should only be serviced by Witt or approved repairer. The dirt filters however can be replaced by the user.

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