What are flanged and welded non-return valves?

The overall lengths of flanged non-return valves conform to standard dimensions, so replacement of broken valves can be done without pipe modifications. In new installations, it is often more economical to use non-return valves installed between flanges, as they are lighter in construction and more cost-effective.

In waterworks construction, flanged ball non-return valves remain a viable option if the medium contains material that clogs a conventional non-return valve.

Selection of flanged and welded non-return valves

We assist in selecting a non-return valve that meets the requirements of your application. Our sales representatives can provide you with detailed information on the opening characteristics of each valve, as well as support with sizing if needed.

Also, check out our Konwell Academy webinar on selecting and sizing non-return valves.

For steam, condensate, process media, gases, and liquid fuels

In many processes, it is essential to ensure that the non-return valve does not leak from the flange seal. For such applications, welded non-return valves suitable for a variety of materials with pressure classes up to PN 500 are appropriate.

Our product range also covers ASME non-return valves up to a pressure class of 2500#, including those that lock in the open position and sealing non-return valves.

For cryogenic media

Cryogenic non-return valves require specialized design solutions to meet exceptional cold resistance requirements. Our HEROSEN non-return valves are made from stainless steel and bronze.

Cryogenic non-return valves are available in sizes DN 10-200. They can withstand pressures up to 50 bar at operating temperatures of -196…+120°C. We can size the appropriate non-return valve based on your process data.