Gas regulator installation, you must ensure safety, ensure the use of performance, ease of operation and maintenance, saving installation costs. Here are four points to talk about the installation of the need to pay attention to the specific issues. Gas pressure reducer before the installation of the inspection include the following: appearance, static characteristics, leakage, no-load full travel time, compressive strength, insulation, air tightness and tightness, of which the first five items to be seized . Of course, there are certain requirements for the place of inspection. For example: the ambient temperature is required at 10 ~ 35 ℃; air relative humidity is not more than 75%; the venue has enough space, and the light is sufficient or lighting conditions; around can not have strong vibration and strong magnetic field interference; Requirements and so on. Gas pressure reducer and accessories from the factory to the installation before, during transport by the random vibration caused by the transport and loading and unloading of various shocks, as well as transport and storage process, the environment temperature and humidity changes, which are May cause changes in the performance of gas regulators and accessories. Therefore, it is necessary to test some of the performance before installation. In the installation, about 20% to 30% of the cost of these two are produced. For example, many industrial systems are equipped with shut-off valves and bypass valves to meet the needs of continuous plant production. Shut-off valves are used to shut off gas pressure reducers. By-pass valves are required for maintenance and an additional shut-off valve or bypass Valve, it is necessary to increase the corresponding connecting pipelines, which will increase the cost; and some piping options, just a shut-off valve can play the role of gas-cut off the entire gas cut off, such piping will save some installation costs . Any design and installation of the bleed valve should be avoided. High-pressure fluids are inevitably accumulated in the shut-off. If the potential energy for accumulating fluid is high, install bleed valves on both sides of the gas pressure reducer. After the system is cut off, the energy of the residual high-pressure fluid in the gas pressure reducer can be released, the safety of personnel is protected, the gas pressure reducer is repaired, and the discharge valve capable of limiting the flow rate is also considered. Prevent Leakage The gas pressure reducer is not allowed to leak during installation. In use, if the filler culvert, flange gasket and other parts of the formation of cracks or pores may leak. If the operating conditions of the fluid medium are harsh, such as high temperature, high pressure, corrosive fluid, then the damage will be aggravated, the risk of leakage even greater. There are many ways to prevent leakage. In the process of installation, the choice of packing, the choice of sealing method, the selection of gas pressure reducer with good sealing performance and so on are all factors that must be considered. Gas pressure reducer removal and maintenance, the bypass valve can be used to operate the production process. When the controlled flow is too large, the gas regulator can not be properly adjusted, as a contingency measure, the bypass valve can also be used as a gas pressure reducer parallel connection scheme, the process control. To reduce costs, large diameter gas pressure reducer installed hand wheel actuator, can replace the bypass valve to operate. Bypass valve installation should be easy to operate, it and the gas pressure reducer and upstream and downstream shut-off valve together to form a gas pressure reducer group. Therefore, the installation of gas pressure reducer and shut-off valve should be supporting the consideration of the bypass valve, and at the same time to complete the construction and installation. The nominal diameter of the bypass valve is the same as the nominal diameter of the pipe, and the withstand voltage level is also consistent with the withstand voltage of the process. Gas pressure reducer, the downstream cut-off valve and bypass valve installation, the downstream cut-off valve and the gas pressure reducer between the straight pipe length should be considered and resistance to the flow of fluid flow state. Long straight pipe length is conducive to the stability of the fluid after the shut-off valve, the fluid flow can be smooth and reduce the impact of turbulence and reduce noise; straight pipe length is short, the fluid is not stabilized after the shut-off valve into the gas pressure reducer, However, the length of the straight pipe is short, which helps to reduce the pipeline resistance and increase the pressure drop at both ends of the gas pressure reducer, so as to reduce the distortion of the flow rate and facilitate the stable operation of the control system. Therefore, the pros and cons should be weighed and taken into consideration. According to experience, usually the upstream side should have 10D ~ 20D straight pipe section, the downstream side of 3D ~ 5D straight pipe section (D for the pipe diameter), if necessary, should be set rectifier device. Gas pressure reducer output signal connection Gas pressure reducer output signal is the valve position signal, which can be an analog signal or digital signal. Should check the gas pressure reducer input signal at the same time, check the valve position signal is correct. When using HART or smart electrical valve positioners, check that the valve position information is correctly transmitted. Gas pressure reducer full stroke operation should pay attention to the valve core and seat are mechanical vibration and abnormal noise. Gas pressure reducer input signal connection, usually check with the valve positioner. Gas pressure reducer input signal from the controller, the controller output a starting signal to check whether the gas pressure reducer at the starting position; output an end signal to check whether the gas pressure reducer in the end position. To do this, check the pressure of the supply air source, filter the pressure reducer work, the hydraulic pressure supplied by the hydraulic system, the power supply is normal, the output signal is correct, etc., and at least 5 points in the measurement range to check the input signal and valve position Whether to meet the desired relationship. Should check the gas, gas off the role of the right way, whether to meet the process requirements of the production process. Line commissioning is used to check the connection of signal lines, gas lines or hydraulic lines to the gas pressure reducer. Hand wheel mechanism debugging Check the hand wheel mechanism can rotate and move correctly, limit and lock device is easy to use. When the deviation exceeds the allowable deviation limit, the corresponding debugging should be carried out. For example, change the position of the position switch and check for leaks in the wiring or piping. Gas pressure reducer check gas pressure reducer pressure drop check in the water simulation debugging. During the entire operation of the gas pressure reducer, check whether the pressure drop at the two ends of the gas pressure reducer changes, whether cavitation or flashover occurs, how the flow changes, and whether the flow characteristics of the original design are met. The control system should meet the negative feedback requirements. The controller, the detection transmitter, the gas pressure reducer (including the valve positioner) and the controlled object should be considered together and the positive and negative effects of the controller should be set. The negative feedback criterion is that the total gain of open-loop control system is positive. Set the controller positive and negative reaction, the controller can measure the end of the analog input signal to increase or decrease, observe the controller output changes in line with the mode of action requirements, and check the gas decompressor action is correct, Is it possible to change the controlled variable to a decreasing direction? Response time checking Some control systems have strict requirements on the response time of the gas pressure reducer. At this time, the response time of the gas pressure reducer should be checked. Timing begins when the controller output signal changes, until the gas pressure regulator valve reaches 63% of its final steady-state position, which is the response time, which should meet the operational requirements of the process. System Debugging Gas Regulator is the terminal control unit of the implementation of the system, before running the need for system debugging. System debugging work should be carried out with the process operation. Valve positioner installation Valve positioner valve position detection device and the gas pressure reducer stem or valve shaft directly connected, therefore, the installation should ensure that the feedback signal to correctly and timely reflect the valve position signal and changes. Normally, the valve positioner is supplied with the gas pressure reducer and the connection between the two is done by the manufacturer. When the production process control valve positioner needs to be added, valve positioner valve position detection device should ensure that the action is correct, reliable and flexible, mechanical feedback lever fulcrum gap should be as small as possible, the valve positioner signal lines should be connected properly, the gas source Pipeline and output lines, the input line should be marked; valve positioner valve position signal should be conducive to the operation and maintenance personnel observation. SAFETY PIPELINES Before installing the gas pressure reducer, install all fittings and piping clean, as sand, scale and iron filings in the piping can damage the inner surface of the gas pressure reducer, especially the most demanding sealing surfaces. When the system pressure fluctuations, it is recommended to install buffer facilities in the pipeline. If the fluid being discharged is a noxious gas or liquid, the line used to discharge the fluid must be connected to a safe location or to a safe, special container to protect personnel from harm and to the environment. To ensure that the performance of gas regulator installed, we should try to ensure that its performance is not affected. This effect disrupts the various factors considered when selecting gas regulators. Search Keyword: More Valve Technical Articles Valve Products Supply Information
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