The precision valve was returned for evaluation.Device history record (dhr) - product code 82-5465 with lot 3959742, conformed to the specifications when released to stock.Failure analysis - the valve is a precision valve with 5 dots.The valve was visually inspected: no defects were noted.The valve was hydrated.The valve was leak tested and no leaks noted.The valve passed the test for occlusion, reflux, siphon guard and pressure.No root cause could be determined as the technician could not confirm any problem with the valve at the time of investigation.The possible root cause for the issue reported by the customer, could be due to biological debris and protein build up interfering with the valve mechanism, at the time of investigation no functional issues were noted.
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