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The installation of gas relief valves must ensure safety, ensure performance, ease of operation and maintenance, and save installation costs. The following points will discuss the specific issues that need to be addressed during installation. The inspection of the gas pressure reducer before installation mainly includes the following contents: appearance, static characteristics, leakage, total no-load time, pressure strength, insulation performance, airtightness and tightness, among which the first five items are mandatory inspection items. . Of course, there are certain requirements for the place of inspection. For example: the ambient temperature requirement is between 10 and 35°C; the relative air humidity is not more than 75%; the venue has enough space and there is sufficient light or lighting conditions; the surrounding can not have severe vibration source and strong magnetic field interference; the power source and air source are in compliance Requirements and so on. Before the gas pressure reducer and accessories are shipped from the factory to the installation, they are subjected to random vibrations and various impacts during loading and unloading, as well as changes in the temperature and humidity of the environment during transportation and storage. May cause changes in the performance of gas regulators and accessories. Therefore, it is necessary to perform partial performance inspection before installation. In the installation, about 20% to 30% of the costs are generated by these two items. For example, in order to meet the needs of continuous production equipment, many industrial systems are installed shut-off valve and bypass valve, cut-off valve used to cut off the gas pressure reducer, need to use the bypass valve for maintenance, add a cut-off valve or bypass Valves, it is necessary to increase the corresponding connecting pipeline, which will increase the cost; and some piping solutions, only one shut-off valve can be used to repair the entire role of the gas pressure reducer, this piping scheme will save some installation costs . Installation of Drainage Valves Any one of the piping design and installation will inevitably accumulate high pressure fluids when shut off. If the potential energy for accumulation of fluids is high, discharge valves should be installed on both sides of the gas pressure reducer. After the system is shut off, the energy of the high-pressure fluid remaining in the gas pressure reducer can be released to protect the safety of the personnel, which is beneficial to the maintenance of the gas pressure reducer, and the use of a discharge valve capable of limiting the flow can also be considered.
Preventing Leakage The installation process does not allow the gas pressure reducer to leak. During use, leaks may occur if gaps or micro-holes are formed in the packing lining, flange gasket, etc. If the operating conditions of the fluid medium are severe, such as high temperature, high pressure, and corrosive fluid, the damage will be exacerbated and the risk of leakage will be greater. There are many ways to prevent leakage. In the installation process, the choice of packing, the choice of sealing method, and the selection of gas pressure reducer with good sealing performance are all factors that must be considered. When the gas pressure reducer is disassembled and repaired, the bypass valve can be used to operate the production process. When the controlled flow is too large and the gas pressure reducer can not be normally adjusted, the bypass valve can also be used as a parallel connection scheme of the gas pressure reducer to control the process as an emergency measure. To reduce costs, large-diameter gas pressure reducers are equipped with handwheel actuators that can be used instead of bypass valves. The installation of the bypass valve should be easy to operate. It forms a gas pressure reducer group together with the gas pressure reducer and the upstream and downstream shut-off valves. Therefore, when installing the gas pressure reducer, it should be considered with the shut-off valve and the bypass valve, and the construction and installation should be completed at the same time. The nominal diameter of the bypass valve is the same as the nominal diameter of the pipeline, and the withstand voltage level is also consistent with the process withstand voltage level. The length of the straight pipe section between the installation of the upper and lower shut-off valves and the bypass valve of the gas pressure reducer, and the downstream shut-off valve and the gas pressure reducer shall take into account the pipe resistance and the influence on the fluid flow state. The long length of the straight section is beneficial to the stability of the fluid after the shut-off valve, the smooth flow of the fluid, the reduction of turbulence effects and the reduction of noise; the length of the straight section is short, and the fluid enters the gas pressure reducer after it has not been stabilized after the shutoff valve. The noise increases, but the short straight pipe length is beneficial to reduce the pipeline resistance, increase the pressure drop across the gas pressure reducer, and reduce the distortion of the flow characteristics, which is conducive to the stable operation of the control system. Therefore, we should weigh the pros and cons and consider it comprehensively. According to experience, there is usually a straight pipe section of 10D to 20D on the upstream side, and a straight pipe section of 3D to 5D on the downstream side (D is the pipe diameter), and a rectifying device should be provided if necessary. Connection of the gas pressure reducer output signal The gas pressure reducer output signal is a valve position signal, which may be an analog signal or a digital signal. When checking the gas pressure reducer input signal, check that the valve position signal is correct. When using HART or smart electric valve positioner, check whether the valve position status information can be transmitted correctly.
The gas pressure relief valve should pay attention to the installation process
The reducing valve uses the opening degree of the opening and closing member in the control valve body to regulate the flow of the medium, reduces the pressure of the medium, and at the same time adjusts the opening degree of the opening and closing part by means of the pressure of the valve to make the pressure behind the valve. Keep within a certain range, and spray cooling water into the valve body or behind the valve to reduce the temperature of the medium. This type of valve is called a decompression desuperheating valve. The characteristic of this valve is to keep the exit pressure and temperature within a certain range under the constant change of inlet pressure. Pressure reducing valve is an essential part of pneumatic control valve, the main role is to decompress and stabilize the pressure of the air source to a fixed value, in order to adjust the valve to obtain a stable air power for adjustment control. This type of valve should generally be installed horizontally in the pipeline.
Stainless steel ball valve