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US Patent: 1,806,301
Pressure controlled valve
Patentee: John Le Valley (exact or similar names) - Painted Post, NY USPTO Classifications: 137/102, 137/494, 137/516.25 Tool Categories: industrial tools : pressure regulators industrial machines : pneumatic : air compressors : compressor relief valves Assignees: Ingersoll-Rand Co. - Jersey City, NJ Manufacturer: Ingersoll-Rand Co. - Jersey City, NJ Witnesses: Unknown	Patent Dates: Applied: Jan. 14, 1928 Granted: May 19, 1931 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for Ingersoll-Rand Co.
Description: Improvements to the valve of patent 1,138,278 "to enable the valve to be closed and opened more positively."

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