What are the rules for installing pipeline valves? Do they need to meet certain installation requirements?
1. When installing, pay attention to the direction of the medium flow should be consistent with the direction of the arrow on the valve body.
2. Before the condensed water enters the return main pipe after the steam trap, a check valve should be installed to prevent the condensed water from flowing back.
3. The rising stem valve cannot be installed underground to prevent the valve stem from rusting. In the trench with a cover, the valve should be installed in a place that is convenient for maintenance, inspection and operation.
4. For some pipelines that require relatively small or no water hammer when closing, it is best to choose slow-closing butterfly check valves and slow-closing swing check valves.
5. When installing threaded valves, it is necessary to ensure that the threads are intact and apply sealing fillers according to the different media. When tightening, the force should be uniform to prevent damage to the valve and valve accessories.
6. When installing socket-welded valves, there should be a gap of 1-2m between the socket and the socket to prevent excessive thermal stress during welding from causing the weld to bulge and crack.
7. When installing on a horizontal pipeline, the valve stem should be straight up or tilted to a certain angle. The valve stem is not allowed to be installed downward.
8. The bottom layer of the weld between the butt valve and the pipeline should be welded by argon arc welding. The valve should be opened during welding to prevent overheating and deformation.
9. Before installing the steam trap, the pipeline must be purged with pressurized steam to remove debris in the pipeline.
10. Steam steam traps should not be installed in series.
11. Diaphragm check valves are often used in pipelines prone to water hammer, because the diaphragm can well eliminate the water hammer caused by the reverse flow of the medium, but it is generally used on low-pressure and normal temperature pipelines due to temperature and pressure constraints.
12. A filter should be installed before the steam trap to ensure that the steam trap is not blocked by pipeline debris, and the filter should be cleaned regularly.
13. The valve connected with flanges and threads should be closed during installation.
14. The flow direction of condensate water should be consistent with the arrow mark of the steam trap installation.
15. The steam trap should be installed at the lowest point of the equipment outlet to discharge condensed water in time to prevent steam blockage in the pipeline.
16. When installing flange valves, ensure that the two flange end faces are parallel and concentric.
17. Valves should be installed before and after the steam trap to facilitate the repair of the steam trap at any time.
18. Mechanical steam traps should be installed horizontally.
19. If steam is found to be leaking from the steam trap, it is necessary to drain the sewage and clean the filter in time, check it frequently according to the actual use situation, and repair it at any time if there is a fault.
20. Do not let the check valve bear weight in the pipeline. Large check valves should be supported independently so that they are not affected by the pressure generated by the pipeline system.
21. The main pipe for collecting condensed water after the steam trap cannot climb the slope, which will increase the back pressure of the steam trap.
22. If there is no position to install the steam trap at the lowest point of the equipment, a water return bend should be added at the lowest point of the water outlet to increase the condensed water level before installing the steam trap to prevent steam blockage.
23. The outlet pipe of the steam trap should not be immersed in water.
24. If condensate is recovered after the steam trap, the outlet pipe of the steam trap should be connected to the main pipe from the top of the recovery main pipe to reduce back pressure and prevent backflow.
25. Each equipment should be equipped with a steam trap.
30. The lifting horizontal flap check valve should be installed on the horizontal pipeline.
31. When installing a steam trap on the steam pipeline, a condensate collection well close to the radius of the main pipeline should be set up in the main pipeline, and then a small pipe should be used to lead it to the steam trap.
32. If condensate is recovered after the steam trap, pipelines with different pressure levels need to be recovered separately.
33. The lifting vertical flap check valve needs to be installed vertically.
34. When the mechanical steam trap is not used for a long time, it is necessary to remove the drain screw and drain the water inside to prevent freezing.
35. There needs to be a non-insulated subcooling pipe of more than one meter in front of the thermostatic steam trap, and other types of steam traps should be as close to the equipment as possible.
