New Solenoid Valve Design for Demanding Cryogenic Applications

Nadi L90 solenoid valve

Nadi L90 solenoid valve

The L89 cryogenic solenoid valve from Nadi Srl of Milan has been successfully employed in liquid gas installations around the world for many years, often to improve reliability on plants using valves from other manufacturers

Last year, Nadi were approached by an Italian manufacturer of climate chambers to offer a solution as they had solenoid valves from a major valve manufacturer that were failing.

Conventional valve ‘sticking’ in liquid gas applications is caused by vapour or dirt freezing at cryogenic temperatures and bridging the close tolerances of the moving components.

Upon investigation it was found that there wasn’t actually a mechanical problem with the existing valves, it was just that they could not cope with the particular application and were only partially opening thus restrictingthe flow. Analysis of this problem showed that instead, the complex flow path of the LN2 regulation circuit in conjunction with the fluid density, pressure and cycle rates were preventing the valve from operating correctly.

Nadi took this information and developed a completely new valve design based on their existing L89 model but encompassing some radical changes to the internal parts to overcome the problem in this application. Subsequent testing demonstrated that the new design removed the partial opening problem and offered a significant performance increase for cryogenic gas systems over the original L89 design.

This higher performance valve assembly has now been standardised as the L90, completely superseding the L89 model and all body material, size and certification options from the L89 are carried forward with the new valve.

The L90 is currently available in sizes from 3/8” to ¾” for safe or hazardous area installations and stainless steel body versions are available in the most popular ½” and ¾” sizes.

The Nadi range of solenoid valves including the L90 is exclusively available in the UK from Red Dragon Ltd in South Wales.

Red Dragon Ltd
Tel: +01443 772500
www.reddragonvalves.co.uk


Published: 14th May 2015

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