First, must pay attention to inspection before installation
1. Carefully check whether the valve model and specifications meet the requirements of the drawings.
2. Check if the valve stem and the valve flap are open and whether they are stuck or skewed.
3. Check whether the valve is damaged, and whether the threads of the threaded valve are correct and intact.
4. Check whether the joint between the valve seat and the valve body is firm, the connection between the valve disc and the valve seat, the valve cover and the valve body, and the valve rod and the valve flap.
5. Check that the valve gasket, packing and fasteners (bolts) are suitable for the nature of the working medium.
6. The obsolete or long-lasting pressure reducing valve should be disassembled, and dust, sand and other debris should be cleaned with water.
7. Clear the vent cover and check the seal. The disc must be closed tightly.
Second, pay attention to the general provisions of the installation
1. The position where the valve is installed should not interfere with the operation, disassembly and maintenance of the equipment, pipes and the valve body itself, and at the same time, the appearance of the assembly should be considered.
2. The valve on the horizontal pipe, with the stem installed upwards, or inclined at a certain angle, cannot be installed with the handwheel down. Valves, stems, and handwheels on high-altitude pipelines can be installed horizontally, and the chain can be opened and closed remotely using the chain at a low elevation.
3. Symmetrical arrangement, neat and beautiful; the valve on the riser, under the premise of process permission, the valve hand wheel to the chest height is most suitable for operation, generally 1.0-1.2m from the ground is appropriate, and the stem must follow the operator Directional installation.
4. The valve on the side-by-side riser should have the same centerline elevation and the net distance between the handwheels should not be less than 100mm; the valves on the side-by-side horizontal pipeline should be staggered to reduce the distance between the pipes.
5. When heavy valves are installed on pumps, heat exchangers, etc., valve supports shall be provided. When the valves are operated frequently and are installed on the valve more than 1.8m away from the operating surface, a fixed operating platform shall be provided.
6. The arrow of the valve body is marked, and the direction of the arrow is the flow direction of the medium. When installing the valve, care should be taken to point the arrow at the same direction as the flow of media in the pipe.
7. When installing flanged valves, ensure that the two flange faces are parallel and concentric and do not use double gaskets.
8. When installing threaded valves, one threaded valve shall be fitted with a live connection for ease of disassembly. The setting of live connection should take into account the convenience of overhauling, which is usually the flow of water through the valve after the live connection.
Third, pay attention to the following small details
1. The valve body material of the valve is made of cast iron and it is brittle, so it must not be struck by heavy objects.
2. When carrying the valve, it is not allowed to throw; when hoisting or hoisting the valve, the rope should be attached to the valve body, and it is strictly prohibited to pry on the hand wheel, valve stem and flange bolt hole.
3. The valve should be installed in the most convenient place for operation, maintenance and inspection. It is strictly prohibited to bury it underground. Directly buried valves and valves on the trenches shall be provided with inspection wells to facilitate the opening and closing of the valves.
4. The thread should be completely intact, and when the thread is wrapped, the lead oil or the PTFE tape is twisted, the spanner must be screwed into the hex body of the end of the tube.
5. When installing the flange valve, pay attention to tighten the connecting bolt along the diagonal direction, and use even force when twisting to prevent the gasket from deviating or causing deformation and damage of the valve body.
6. The valve should remain closed during installation. For threaded valves close to the wall, it is often necessary to remove the valve stem and handwheel to install the valve. When disassembling, remove the handwheel after turning the valve open.
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