Simple installation method for natural gas blind valve in chemical plant

　　1. Appearance inspection must be carried out before installation. For gate valves whose working pressure is greater than 1.0 MPa and have a disconnection function on the main rod pipe, tests on compressive strength and rigorous characteristics must be carried out before installation, and they can be used only after reaching the standard.

　　2. When installing the myopia glasses valve, attention should be paid to the orientation of the material fluidity. All normal fluidity orientation of the material should be consistent with the orientation of the arrow symbol marked on the oil circuit board, otherwise all normal fluidity of the material will be disconnected. The pump bottom valve should be installed at the bottom of the centrifugal pump moisture absorption pipe.

　　3. When the myopia glasses valve is closed, it will cause water hammer working pressure in the pipeline. In more serious cases, it will cause the destruction of gate valves, pipelines or machinery and equipment, especially for small-mouth or high-pressure pipelines, so check valves should be used Pay attention to the aspect ratio of the reader.

　　4. When the upper and lower valves are loosened, substances must flow out. To ensure safety, please turn off the liquefied gas disc valve in front of the blind valve when closing. In addition, please use natural ventilation and other safety precautions. .

　　5. The silicone sealing ring should not adhere to the oil circuit board or produce friction, so as to avoid destroying the silicone sealing ring and destroying the working characteristics of the gate valve.

　　6. ​​The pipeline should also have elastic deformation or offset considering the offset during the whole process of opening and closing the gate valve. It is recommended to install it in the following way.

　　The simple installation method of natural gas blind valve in chemical plant The installation method and maintenance of blind valve are as follows:

　　A. Before installation, check carefully whether the valve model, specification model, application material, and application temperature are consistent with the pipeline construction.

　　B. The arrow mark of the valve on the gate valve is consistent with the material flow in the pipeline.

　　C. Check that the gate valve is cleaned intact and undamaged during the whole process of transportation, and then the installation can be carried out.

　　D. In manual operation, clockwise is off, and the opposite direction is on. In actual operation, pay attention to the second hand or mark the inner diameter gauge.

　　E. When wiring, you must first check that the order of the electrical phases is correct, and then install it. After wiring, use the "start light" method to adjust carefully, and notify our company in advance.

　　f. After the electric pile is wired, the gate valve must be manually opened to the semi-closed position. When the power is switched on, the shaft is adjusted, and the power switch is accurate to determine whether the stroke arrangement, operation, and torque operation are reasonable, and then it can be declared Delivery and use, to avoid the incorrect opening and closing position of the data signal caused by the incorrect switching power supply and the motor zero line and the actual opening and closing positions, which may cause serious damage to the gate valve and cause a major safety accident. The gate valve must be fully opened when the pipeline is under working pressure and water pressure test.

　　G, butt welding flanges can be used as much as possible, and socket welding construction flanges can also be used. If the temperature of the material pipeline exceeds 100 ℃, a burn mark should be used on the gate valve. During the whole process of opening and closing of the blind plate valve, there is external leakage of substances. It is proposed to modify the butterfly valve and other pressure control systems before this valve to reduce the external leakage of the gate valve during the whole process of opening and closing. The blind plate valve is installed on the base of the valve. The anchor bolts should be fixed on the steel fence service platform or concrete basically. The blind plate valve has been adjusted in the original factory. It must be manually operated when the blind plate valve is in the middle position. The switching power supply starts the actual operation of the light, and observe whether it is the same as the loosening and clamping rotation of the gate valve.

　　H. Before adjustment, be sure to loosen the three anchor bolts around the expansion joint to ensure the expansion joint's expansion capacity.