- pneumatic ball valve Adjust the pneumatic valve performance testing and maintenance

regulating pneumatic valve performance testing: adjust the performance of the pneumatic valve, the following items should be focused on testing and calibration. ） Basic error: ~ kPa signal increase/decrease input air chamber (smoothly 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 %, %, %, %, %, points out basic error measuring instrument should be limited to be tested/pneumatic valve basic error limits. ） 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. ） 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. ) Leak test: test medium for the normal temperature water, usually when the differential pressure of the pneumatic valve is smaller than the kPa, test pressure in kPa, when pneumatic valve working pressure difference is greater than the kPa made to allow differential pressure. Experimental medium should be in accordance with the provisions, flow into the pneumatic valve, pneumatic valve can be directly connected the atmosphere or connection export through atmospheric low head measuring device, upon confirmation of pneumatic valve and downstream all over completely filled with medium, before the acquistion leakage. The main pneumatic valve, but also do crush test. ) To form a complete set of pneumatic valve positioner, before the installation, commissioning, shall be the scene debugging. On-site inspection maintenance adjustments of the adjustment of pneumatic valve pneumatic valve due to direct contact with the process medium, its quality directly affect the system performance and environmental pollution, so to adjust the pneumatic valve must be regularly maintenance and preventive maintenance, especially for use conditions and important occasions more should pay attention to maintenance work. Its key check maintenance parts:) For use in high pressure and corrosive medium occasion regulating pneumatic valve, pneumatic valve body wall, diaphragm often hit from the medium and corrosion, should focus on checking pressure, corrosion condition. ) Fixed pneumatic seat with screw thread, the inner surface is susceptible to corrosion and make the pneumatic valve seat is loose, should check the parts mainly; To work under high pressure difference of pneumatic valve should also check whether the pneumatic valve seat sealing surface erosion and cavitation. ) Pneumatic valve core by the medium of scouring and corrosion is most serious, carefully check whether maintenance by corrosion, wear and tear, especially under the condition of high pressure differential pneumatic valve core due to cavitation phenomenon more serious wear and tear. ） Check the diaphragm seal, 'O' type circle and other cracking or aging. ） 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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