The adjustment and calibration of the sanitary valves
1, In the gas test bed, by adjusting the load imposed on the valve to correct the health of the valve opening pressure. Lever-type sanitary valve need to be adjusted by the hammer, spring-style sanitary valve need to be adjusted the amount of spring compression. Sanitary valve opening pressure should be consistent with the boiler, pressure vessel safety and technical supervision of the relevant regulations.
2, In the container, by adjusting the sanitary valve adjustment valve ring and valve clearance, to adjust the sanitary valve discharge pressure and back seat pressure. If the sanitary valve in the open pressure only leak but not take-off, but although the pressure drop after a violent shake and "beep" sound, the gap is too large, it should be adjusted smaller. If the back seat pressure is too low, it is the gap adjustment ring is too small, should be properly adjusted. Steam sanitary valve discharge pressure should be less than or equal to 1.03 times the opening pressure, opening and closing pressure should not exceed the opening pressure of 10%. Air or other gases with sanitary valves, the discharge pressure should be less than or equal to 1.10 times the opening pressure, opening and closing pressure is not greater than 15% of the opening pressure.
3, Sanitary valve calibration and pressure adjustment, there must be the use of the unit in charge of the boiler and pressure vessel safety technical personnel presence, adjustment and calibration device with the accuracy of the pressure gauge should not be less than 1, online adjustment should There are security measures.
4, The calibration process, the calibration staff should be a timely record. Checking the qualified sanitary valves, installation of the relevant accessories should be sealed after the device to prevent the change has been adjusted to a good state.