Patent ID: 7988130

Claim:
A method of operating a valve in a vacuum exhaustion system, comprising the steps of: (a) disposing a valve on a vacuum exhaustion fluid passage in a vacuum exhaustion system, wherein the valve comprises i. a first body having a valve seat formed on a bottom face of a valve chamber in communication with a first fluid passage connected to a flow-in passage and to a flow-out passage; ii. a metal diaphragm valve body permitted to rest on or move away from the valve seat; and iii. a driving assembly operating to allow the valve body to rest on or move away from the valve seat so that the first fluid passage is closed or open, respectively, wherein the driving assembly controls fluid flow by allowing the valve body to rest on, or move away from, the valve seat respectively, wherein an aluminum passivation is applied on surfaces of the first body having contact with fluid; (b) heating an inside wall of the first fluid passage of the valve to a high temperature; and (c) preventing dissociation of fluid in the first fluid passage and preventing adherence of moisture to an inside wall of the first fluid passage.