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Inspection before installation of pipeline valve and precautions during installation

by:Sino Valves     2021-02-27
(1) Check before installation. There are many types and specifications of commonly used valves. Which valve to use should be based on the purpose of the valve, the characteristics of the medium, the maximum working pressure, the maximum temperature, and the flow rate and flow rate of the medium or the nominal diameter of the pipeline. select. Before installation, carefully check whether the models and specifications of all valves meet the design requirements. According to the valve model and factory instructions, check whether they can be used under the required conditions, and perform water pressure or air pressure test if necessary. In addition, check whether the packing is intact, whether the gland bolts have sufficient adjustment margin, and whether the intermediate rods and valve discs are flexible, whether they are stuck or skewed. The sealing surface of the valve disc must be closed tightly. For the threaded valve, the thread quality should be checked. Unqualified valves cannot be installed and should be stacked or marked separately. (2) Things to pay attention to when installing the valve. When handling the valve, it is not allowed to throw it by hand to avoid damage and deformation. When stacking, carbon steel valves should be separated from stainless steel valves and non-ferrous metal valves. When hoisting the valve, the wire rope should be tied to the connecting flange of the valve body and the bonnet, and never tied to the handwheel or valve stem to prevent frequent damage to the valve skewer and handwheel. The exposed stem valve cannot be directly buried in the ground to prevent corrosion of the stem. It can only be installed in a covered floor. The valve should be installed at a 9t position that is convenient for operation, inspection, disassembly, maintenance and operation. The valve installation position should not hinder the disassembly, maintenance and operation of equipment, pipelines and the valve itself. The installation height should be convenient for operation and maintenance. Generally, the valve handle should be 1~1.2m above the ground. For valves with more operations, when they must be installed more than 1.8m from the operating surface, a fixed operating platform should be installed; when they must be installed above or below the operating surface, an extension rod should be installed or the valve stem should be installed horizontally, and then Install a handwheel or remote control device with a transmission device. The angle between the axis of the valve drive device should not be greater than 30°, and the joint should be flexible to rotate, flexible and easy to use during operation, and instructions are difficult to confirm. For valves with thermal displacement, the transmission should have compensation measures. For horizontal pipelines, it is best to install the valve vertically upwards or install the valve stem within the upper semicircle, but do not install the stem downwards. The valve skewer and hand wheel on the vertical pipeline must be installed along the direction of the fine line. When possible, the valve should be installed as centralized as possible to facilitate abduction. The valves on the tower area pipelines above 4m above the ground should not be installed outside the platform to facilitate installation and operation. For directional valves, the installation direction should be determined according to the flow direction of the pipeline during installation. For example, when installing a shut-off valve, the medium should flow from below the valve disc to above, commonly known as low inlet and high outlet. When installing the cock and gate valve, allow the medium to flow out from either end. When installing a check valve, special attention must be paid to the flow direction of the medium to ensure that the valve disc can automatically open. In important situations, an arrow should be clearly marked outside the valve body to indicate the flow direction of the medium. For swing check valves, ensure that the rotation pivot of the insert plate is installed in a horizontal position. For lift check valves, ensure that the center line of the valve disc is perpendicular to the horizontal plane. For valves with special requirements, be familiar with the installation requirements. For example, when installing a lever type safety valve and a pressure reducing valve, the center line of the valve disc and the horizontal plane must be perpendicular to each other, and correction must be made when it is found to be inclined. When installing a threaded valve on the pipeline, a connector must be installed near the valve for easy disassembly and assembly. A shut-off valve should be set for the auxiliary system pipeline entering the workshop, which can be cut off from the main pipeline when the workshop is stopped for maintenance. The installation height of these valves is generally high and should be arranged together as much as possible in order to set up a fixed operating platform. Before installing the high-pressure valve, the product certificate and test records must be reviewed. High-pressure valves are mostly angle valves. They are often used in series with two in series. When opened, the starting force is large. A valve frame must be set to support the valve and reduce the starting stress. The installation height is preferably 0.6-1.2m. The pipe connections on pumps, heat exchangers, towers and containers should not bear the weight of valves and pipes. Valves with a nominal diameter of DNu003e 80mm should be equipped with brackets. Lining, spraying and non-metallic valves have high quality and low strength. In addition to considering the process requirements, they should be arranged as centralized as possible to facilitate the design of the valve frame. Even a single valve should be fixed on the valve frame. When installing heavy valves on horizontal pipes, consider installing brackets on both sides of the valve. When installing flanged valves, ensure that the end faces of the two flanges connected to it are parallel and coaxial with the valve flange. Especially when installing a valve with brittle materials such as cast iron, it is necessary to avoid damage to the valve due to incorrect installation position and uneven force. When tightening the flange screws, a symmetrical or criss-cross method should be adopted, and the screws should be tightened gradually in several times.
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