Abstract: There is disclosed herein a gas pressure regulator having valve means for stopping the flow of gas downstream through the regulator when the pressure of the incoming gas is higher or lower than predetermined acceptable values even though acceptable pressure is subsequently restored, and manually operated means for resetting the valve means after it is determined that the pressure of the gas flowing to the inlet of the regulator has returned to said predetermined acceptable values, provision being made for maintaining a high pressure shutoff valve closed even though pressure of gas in the regulator returns to acceptable pressure by manually operable means not accessible to inexperienced persons.

Abstract: There is disclosed herein a gas pressure regulator having valve means for stopping the flow of gas downstream through the regulator when the pressure of the incoming gas is higher or lower than predetermined acceptable values even though acceptable pressure is subsequently restored, and manually operated means for resetting the valve means after it is determined that the pressure of the gas flowing to the inlet of the regulator has returned to said predetermined acceptable values, provision being made for maintaining a high pressure shut-off valve closed until manually opened even though pressure of gas in the regulator returns to acceptable pressure.

Abstract: There is disclosed herein methods and apparatus for proof testing fluid meters, particularly gas meters of the positive displacement, diaphragm-operated type in which the number of cycles of operations of the valve mechanism of the meter is used as a factor in proving the accuracy of the meter, the number of said cycles being determined by sensing a series of pressure waveforms in the test gas entering and leaving the diaphragm chambers of the meter, which waveforms are characteristic of the particular meter being tested and occur in each cycle and reoccurring cycle of operation of the meter when operating, detecting a characteristic waveform in each series of waveforms amplifying and shaping the characteristic waveform and counting a predetermined number of cycles of said waveforms and comparing the volume of test gas which has passed through the meter as measured by a meter prover with the amount that should have passed during that predetermined number of cycles of operations of the meter.

Abstract: There is disclosed herein a gas pressure regulator having valve means for stopping the flow of gas downstream through the regulator when the pressure of the incoming gas is lower than a predetermined acceptable value even though acceptable pressure is subsequently restored, and a unique method and means, generally not available for use by unauthorized persons, adapted to be manually operated for resetting the valve means after it is determined that the pressure of the gas flowing to the inlet of the regulator has returned to said predetermined acceptable value.

Abstract: There is disclosed methods and apparatus for proving fluid meters, particularly gas meters of the positive displacement, diaphragm-operated type in which the number of cycles of operations of the valve mechanism of the meter is used as a factor in proving the accuracy of the meter, the number of said cycles being determined by sensing a series of pressure waveforms in the test gas entering and leaving the diaphragm chambers of the meter, which waveforms are characteristic of the particular meter being tested and occur in each cycle and reoccuring cycle of operation of the meter when operating, detecting a characteristic waveform in each series of waveforms, amplifying and shaping the characteristic waveform and counting a predetermined number of cycles of said waveforms and comparing the volume of test gas which has passed through the meter as measured by a test bell with the amount that should have passed during that predetermined number of cycles of operations of the meter.