Ham-Let H-285 Needle Valve With Rupture Disc.
The H-285 forged valve body, union bonnet and knob handle with rupture disc, is designed to be mounted on our sample cylinders.
The Rupture disc provides protection against over pressure in sampling units by venting the media to the atmosphere on a certain nominal rupture values (1900, 2850 PSI). The rupture disc element is welded to a carrier that is assembled to the valve with an O-ring seal. A rupture disc unit can be easily replaced in the field while the valve remains connected to the sampling unit.
Please see attached datasheet for further information