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Cryogenic valves introduced by Boiswood

17 January 2012

A new range of novel cryogenic valves from Stoehr has been introduced by Boiswood. An advantage of the patented FREES valves for vacuum jacketed pipes is that they can be installed in any position, making it possible to reduce the length of pipework required.

Positioning the valves horizontally for example can allow installation in height restricted locations.

Another advantage is that valves' clearance volume is reduced by up to 80 per cent, making them cleaner to operate and quicker to purge as there is less dead space to retain media or contaminants.

Most cryogenic valves have a relatively large clearance volume as they incorporate the whole spindle chamber and evaporation space. Their valve spindles also have to be a certain length to minimise heat conduction into the media, which also increases their clearance volume. However, with the FREES design, dead space is greatly reduced since the whole spindle chamber including evaporation space is separated from the media.

A further benefit is that the smaller clearance volume makes the valves faster to evacuate, leading to quicker start-up after maintenance and thereby saving costs throughout the lifetime of the valve. To make purging easier, the valves can be supplied with an integrated purge connection.

FREES valves are available in stainless steel as well as specialty materials such as titanium, Hastelloy and Monel.


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