Regulator is particularly important and is very commonly used in the production of industrial control equipment, it is working properly or not is directly related to the entire unit production is normal or not. At present, with the changing of regulating valve technology, regulating valve manufacturers and form is various, function also vary, the following focuses on various types of regulating valve before installation and commissioning of the common problems should be paid attention to. Control valve body of water pressure test including body pressure test and water pressure test valve core seated when the leak test. Normally, when the design pressure of more than 10 mpa regulating valve, the valve pressure test must be conducted to test the body itself and the pressure of the valve cover on. 1, the regulator pressure test should pay attention to the question 1) Pressure test using manual testing pump to the valve body hydrostatic test, it is strictly prohibited the use of electric hydraulic test pump. 2) Test medium for clean water. 3) The test pressure as the design pressure of 1. 25 times. 4) Pressure test gauge shall be calibrated, the accuracy should not be lower than 1. Level 5, the appropriate scale limit 1 for testing pressure. 5 ~ 2 times. 5) Gas valve open during pressure test for valve valve core to open at least 20% of the opening, it is important to keep in mind that in order to prevent the valve core is unilateral damage pressure was too high. Normally regulating valve valve core is to allow certain leakage, according to the control valve leakage level difference, generally only requirements of elevation difference pressure regulator ( Grade V, VI leakage) Leak test. 2, the leak test should be pay attention to the question 1) Pressure test using manual testing pump to the valve body hydrostatic test, it is strictly prohibited the use of electric hydraulic test pump ( Grade VI leakage valve adopts pneumatic test) 2) Test medium for clean water, Grade VI leakage valve adopts clean air) 。 3) Leakage level test pressure when working for Industrial Valves design maximum differential pressure ( Check the design parameters) 。 4) Pressure test gauge shall be calibrated, the accuracy should not be lower than 1. Level 5, limit value of test pressure scale 1. 5 ~ 2 times. 3, the regulator of monomer calibration before the new installation of pneumatic control valve installation shall be set-up to unit. Calibration should reach the performance indicators: basic error: + / - 1. 5% return error: 1. 5% is not sensitive area: 0. 6% today, research section of the valve and electrical valve positioner manufacturers, different function, electric valve positioner tend to be intelligent, specific calibration method is different, there is no longer here. 4, the installation of control valve control valve installation are the key problems that should be paid attention to, the installation quality is directly related to the regulator's operation and performance. The installation process should pay attention to the following questions: 1) Regulating valve before installation, must be carefully remove the dust accumulated by the valve during storage, during the installation process will keep clean. Because dust impurities will make the seat and damage of internal parts. In order to protect the clean, usually in the incomplete opening flange end plate. 2) When regulator is installed, the arrow on the valve body shall be consistent with the medium flow direction. 3) Control valve is a precision component, if they are stress of the pipe deformation, will damage the normal work. Therefore, flange and pipe installation should be vertical and position accurately in order to avoid deformation of the pipeline. Wells and pipelines to the appropriate support to prevent it in bending deformation under the action of the valve weight. 4) When regulating valve and pipe welding must be especially careful. If not enough attention during regulating valve and pipe welding, failed to eliminate stress, will produce deformation. When welding, must strictly avoid welding slag splash into the valve, the existence of welding slag detrimental to the performance of the valve, if the splash splashing on the valve core directly, light directly affects the action of regulating valve, or damage to the valve core and valve seat. 5) Pipeline during pressure test and blow, the regulator should be removed, with the corresponding straight pipe connected to prevent welding slag, iron chips sundry card between valve core and valve seat. Remove the valve opening flange end application plastic cloth bandage firmly. 5, the linkage of the regulating valve test regulator after installed device linkage test must be conducted before driving. Linkage test should focus on the following points: 1) Regulating valve linkage test before the process piping must go through strict purging and qualified, purging not qualified pipeline it is forbidden to install regulator, because the pipe residues such as welding slag, dust and other hard stuff will damage the valve core and valve seat sealing surface. 2) The ends of the butterfly check valve in front of the linkage should not take pressure or blocking blind plate. 3) With the handwheel institutions regulating valve, the handwheel institutions should be 'release' position. Check valve gas supply pressure whether meet the requirements of the control valve of gas supply. 6, in the process of the installation of industrial automation instrument, valve installation and operation of the most complex and most difficult and the most vulnerable. In the whole process, instrument specialty and pipeline should coordinate with each other, support each other, close cooperation, reflected in a timely manner to solve the problems in time, in strict accordance with the requirements, according to the rules of operation, only in this way can guarantee the quality of the installation of the regulating valve and smoothly operation of the quality to ensure the smooth progress of the entire installation project went into operation and the industrial device.
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