Performance of the regulating valve performance testing: regulator, the following items should be focused on testing and calibration. 1) Basic error: 20 ~ 100 kpa signal steadily increase/decrease input air chamber ( Or locator) , measure each point of the tour value, calculate the 'signal - Journey 'relationship with each point error between the theoretical value, the maximum value is the basic error. Sites should be according to the signal range of 0%, 25%, 50%, 75%, 100%, five points and basic error measuring instrument should be limited to a quarter of the tested valve basic error limits. 2) Back to the poor: experiment method. On the same input signal is measured and stroke is one of the biggest difference back to the poor. 3) Always point deviation: experiment method. The signal limit ( Starting point) Is the starting point of basic error deviation; Signal threshold ( At the end) The basic error is the end point deviation. 4) Leakage test: test medium for the normal temperature water normally, when the valve pressure difference is less than 350 kpa, made to 350 kpa pressure experiment, when the valve working pressure difference is greater than 350 kpa made to allow differential pressure. Experimental medium should be in accordance with the provisions, flow into the valve, the Industrial Valves can be directly connected the atmosphere or connection export through atmospheric low head measuring device, upon confirmation of downstream of the valve and all take over completely filled with medium, before the acquistion leakage. The main valve, but also do crush test. 5) For supporting the valve positioner, before the installation, commissioning, shall be the scene debugging. Regulator on-site inspection maintenance regulator due to direct contact with the process medium, its quality directly affect the system performance and environmental pollution, so the valve must be regularly maintenance and preventive maintenance, especially for use conditions and important occasions more should pay attention to maintenance work. The key inspection maintenance parts: 1) For use in high pressure and corrosive medium occasion of regulating valve, the valve body wall, diaphragm often impacted by the media and corrosion, should focus on checking pressure, corrosion condition. 2) The fixed seat with screw thread, the inner surface is susceptible to corrosion and make the seat is loose, should check the parts mainly; To work under high pressure differential Industrial Valves should also check whether the seat sealing surface erosion and cavitation. 3) core by the medium of erosion, corrosion is most serious, carefully check whether maintenance by corrosion, wear and tear, especially under the condition of high pressure differential valve core due to cavitation phenomenon more serious wear and tear. 4) Check the diaphragm seal, 'O' type circle and other cracking or aging. 5) Ptfe packing, sealing grease should be paid attention to whether the aging, mating surface is damaged, should be replaced when necessary.
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