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Priority to ES381868ApriorityCriticalpatent/ES381868A1/en
Publication of ES381868A1publicationCriticalpatent/ES381868A1/en
Improvements in hydraulic gas servo valves, especially for water heaters that consume gas, and which comprise a hydraulic double-acting control device, connected to the gas valve and one of whose enclosures is part of the water circuit, while the another is connected to a negative pressure point of a venturi disposed downstream of the first enclosure, characterized essentially by the fact of inserting in said water circuit a valvular retention device installed to close the water passage in the opposite direction to that of circulation and arranged to operate automatically in response to pressure variations occurring downstream of said first enclosure, so that it opens automatically upon establishment of the functional water circulation and closes when back pressure occurs. (Machine-translation by Google Translate, not legally binding)
ES381868A1970-06-221970-06-22Improvements in hydraulic gas servovalles. (Machine-translation by Google Translate, not legally binding)
ExpiredES381868A1
(en)
Pressure regulator valve for braking and control systems operated by a pressure medium with a seat. (Machine-translation by Google Translate, not legally binding)