Control apparatus or system for purged and pressurized enclosures for electrical equipment
Patent 5101710 Issued on April 7, 1992. Estimated Expiration Date: 
May 14, 2010. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
May 14, 2010. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3016813 3210547 Electric arc spray metalizing apparatus Patent #: 4720044 InventorAssigneeApplicationNo. 522992 filed on 05/14/1990US Classes:454/238, Pressure regulation454/184, ELECTRONIC CABINET454/239, Including automatic control means454/359Including backdraft preventerExaminersPrimary: Joyce, HaroldAttorney, Agent or FirmInternational ClassesF24F 007/007F24F 011/00 AbstractA control apparatus or system for purged and pressurized electrical equipment provides rapid, controlled exchange of pressurizing or purging gas to an electrical enclosure. The control system or apparatus for NFPA Type Y and Type Z electrical equipment enclosures has a source of pressurizing gas, a rapid exchange pressure control filter/regulator, rapid exchange pressure gauge, vent control valve and a manual inlet valve providing for rapid exchange of purging gas to the electrical enclosure during start up, an enclosure control valve, enclosure pressure indicator, a venturi providing controlled leakage from the system, and a pressure loss control alarm or switch. Another embodiment of the control system or apparatus for NFPA Type X electrical equipment enclosures has a rapid exchange pressure control filter/regulator, rapid exchange pressure gauge, vent control valve and an automatic inlet valve providing for rapid exchange of purging gas to the electrical enclosure during start up, and enclosure control valve, enclosure pressure indicator, a venturi providing controlled leakage from the system, and a pressure loss control alarm or switch. | |
